NOWN-DEVandClaude Opus 5.5
455ca86a6c
A body of several pieces (a plate and the islands a cut leaves inside its holes, such as letter counters) was written as one BREP_WITH_VOIDS whose other shells were voids. Export now writes one solid per lump, each with its face colours; a real void stays a void of its lump. Co-authored-by: Claude Opus 5.5 <[email protected]>
1612 lines
74 KiB
Rust
1612 lines
74 KiB
Rust
//! STEP (ISO 10303-21) export: AP242 product structure, assemblies, names and colours.
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//!
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//! Each body's B-rep is written by truck's STEP writer (geometry and topology only), read back
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//! with our Part 21 parser and copied into a file we assemble ourselves: one header and
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//! context, a product per part with its shape representation, named solids, surface colours,
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//! and assemblies as next-assembly-usage occurrences placed by item-defined transformations
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//! (the structure the CAx-IF recommends and our reader follows). Identical geometric entities
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//! (points, directions, placements, curves, surfaces) are written once and referenced; ids are
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//! dense from `#1`.
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use std::collections::HashMap;
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use std::fmt::Write as _;
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use solidcraft_geom::Vec3;
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use crate::body::Body;
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use crate::step_in::p21::{self, Param};
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use crate::{KernelError, Result};
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/// A named, optionally coloured body to export (coordinates in its part's frame, mm).
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pub struct ExportBody<'a> {
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pub name: String,
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pub body: &'a Body,
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pub color: Option<[f32; 3]>,
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}
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/// A part or assembly: its own bodies and placed child products.
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pub struct ExportProduct<'a> {
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pub name: String,
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pub bodies: Vec<ExportBody<'a>>,
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/// (child product index, rigid placement in this product, column-major 4×4, occurrence name).
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pub children: Vec<(usize, [[f64; 4]; 4], String)>,
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}
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/// Header fields.
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#[derive(Clone, Debug, Default)]
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pub struct StepHeader {
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/// FILE_NAME name (the file's own name).
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pub file_name: String,
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/// FILE_NAME time stamp (ISO 8601), empty when unknown.
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pub time_stamp: String,
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pub author: String,
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pub organization: String,
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}
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/// Entities whose identity is topological: never merged even when their text is equal.
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const TOPOLOGY: &[&str] = &[
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"VERTEX_POINT",
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"EDGE_CURVE",
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"ORIENTED_EDGE",
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"EDGE_LOOP",
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"FACE_BOUND",
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"FACE_OUTER_BOUND",
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"FACE_SURFACE",
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"ADVANCED_FACE",
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"ORIENTED_FACE",
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"CLOSED_SHELL",
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"OPEN_SHELL",
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"ORIENTED_CLOSED_SHELL",
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"MANIFOLD_SOLID_BREP",
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"BREP_WITH_VOIDS",
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];
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fn real(x: f64) -> String {
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if !x.is_finite() {
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return "0.".into();
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}
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let s = format!("{x:?}");
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match s.split_once('e') {
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Some((m, e)) => {
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let m = if m.contains('.') { m.to_string() } else { format!("{m}.") };
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format!("{m}E{e}")
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}
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None if s.contains('.') => s,
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None => format!("{s}."),
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}
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}
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/// A STEP string literal (quotes doubled, non-ASCII as `\X2\` UTF-16 runs).
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fn string(s: &str) -> String {
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let mut o = String::from("'");
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for c in s.chars() {
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match c {
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'\'' => o.push_str("''"),
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'\\' => o.push_str("\\\\"),
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c if c.is_ascii() && !c.is_ascii_control() => o.push(c),
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c if c.is_ascii_control() => {}
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c => {
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o.push_str("\\X2\\");
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let mut buf = [0u16; 2];
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for u in c.encode_utf16(&mut buf) {
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let _ = write!(o, "{u:04X}");
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}
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o.push_str("\\X0\\");
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}
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}
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}
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o.push('\'');
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o
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}
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fn param(p: &Param, map: &HashMap<u64, u64>, o: &mut String) -> std::result::Result<(), String> {
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match p {
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Param::Int(i) => {
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let _ = write!(o, "{i}");
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}
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Param::Real(x) => o.push_str(&real(*x)),
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Param::Str(s) => o.push_str(&string(s)),
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Param::Enum(e) => {
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let _ = write!(o, ".{e}.");
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}
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Param::Ref(r) => {
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let n = map.get(r).ok_or_else(|| format!("dangling reference #{r}"))?;
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let _ = write!(o, "#{n}");
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}
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Param::List(v) => {
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o.push('(');
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params(v, map, o)?;
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o.push(')');
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}
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Param::Typed(name, v) => {
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o.push_str(name);
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o.push('(');
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params(v, map, o)?;
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o.push(')');
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}
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Param::Binary(b) => {
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let _ = write!(o, "\"{b}\"");
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}
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Param::Null => o.push('$'),
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Param::Derived => o.push('*'),
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}
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Ok(())
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}
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fn params(v: &[Param], map: &HashMap<u64, u64>, o: &mut String) -> std::result::Result<(), String> {
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for (i, p) in v.iter().enumerate() {
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if i > 0 {
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o.push(',');
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}
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param(p, map, o)?;
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}
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Ok(())
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}
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/// The DATA section under construction.
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#[derive(Default)]
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struct Out {
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lines: Vec<String>,
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/// Geometry text → id (shared entities).
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shared: HashMap<String, u64>,
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/// Surfaces written with the opposite normal to the one they replace.
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flipped: std::collections::HashSet<u64>,
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/// B-spline cylinder sheets of the body being copied under merged faces, with the direction
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/// of the cylinder's parameter seam.
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merged: HashMap<u64, V3>,
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/// Faces of the body being copied: exchange id → written id.
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faces_out: HashMap<u64, u64>,
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}
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impl Out {
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fn add(&mut self, text: impl Into<String>) -> u64 {
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self.lines.push(text.into());
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self.lines.len() as u64
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}
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/// Add, or reuse an identical earlier entity (geometry only).
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fn add_shared(&mut self, text: String) -> u64 {
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if let Some(id) = self.shared.get(&text) {
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return *id;
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}
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let id = self.add(text.clone());
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self.shared.insert(text, id);
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id
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}
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fn point(&mut self, p: [f64; 3]) -> u64 {
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self.add_shared(format!("CARTESIAN_POINT('',({},{},{}))", real(p[0]), real(p[1]), real(p[2])))
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}
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fn direction(&mut self, d: [f64; 3]) -> u64 {
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self.add_shared(format!("DIRECTION('',({},{},{}))", real(d[0]), real(d[1]), real(d[2])))
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}
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fn write_analytic(&mut self, a: &Analytic) -> u64 {
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match a.kind {
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AnalyticKind::Plane { o, z, x } => {
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let ax = self.placement(o, z, x);
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self.add_shared(format!("PLANE('',#{ax})"))
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}
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AnalyticKind::Cylinder { o, z, x, r } => {
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let ax = self.placement(o, z, x);
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self.add_shared(format!("CYLINDRICAL_SURFACE('',#{ax},{})", real(r)))
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}
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AnalyticKind::Cone { o, z, x, r, angle } => {
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let ax = self.placement(o, z, x);
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self.add_shared(format!("CONICAL_SURFACE('',#{ax},{},{})", real(r), real(angle)))
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}
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AnalyticKind::Sphere { o, z, x, r } => {
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let ax = self.placement(o, z, x);
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self.add_shared(format!("SPHERICAL_SURFACE('',#{ax},{})", real(r)))
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}
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AnalyticKind::Torus { o, z, x, big, small } => {
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let ax = self.placement(o, z, x);
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self.add_shared(format!("TOROIDAL_SURFACE('',#{ax},{},{})", real(big), real(small)))
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}
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AnalyticKind::HornTorus { o, z, x, big, small } => {
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// Nine-point rational quadratic circles (quarter arcs, corner weights √½): the
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// tube from the pole round and back, and the turn about z from x.
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let y = cross(z, x);
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let ring = |k: usize| {
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let ang = std::f64::consts::FRAC_PI_4 * k as f64;
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let (scale, w) = if k % 2 == 1 { (std::f64::consts::SQRT_2, std::f64::consts::FRAC_1_SQRT_2) } else { (1.0, 1.0) };
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(ang.cos() * scale, ang.sin() * scale, w)
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};
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let (mut rows, mut weights) = (Vec::new(), Vec::new());
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for i in 0..9 {
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let (ci, si, wi) = ring(i);
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let (rho, h) = (big - small * ci, small * si);
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let (mut row, mut wrow) = (Vec::new(), Vec::new());
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for j in 0..9 {
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let (cj, sj, wj) = ring(j);
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let pt = add(add(o, mul(z, h)), add(mul(x, rho * cj), mul(y, rho * sj)));
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row.push(format!("#{}", self.point(pt)));
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wrow.push(real(wi * wj));
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}
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rows.push(format!("({})", row.join(",")));
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weights.push(format!("({})", wrow.join(",")));
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}
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self.add_shared(format!(
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"(BOUNDED_SURFACE()B_SPLINE_SURFACE(2,2,({}),.UNSPECIFIED.,.T.,.T.,.F.)B_SPLINE_SURFACE_WITH_KNOTS((3,2,2,2,3),(3,2,2,2,3),(0.,0.25,0.5,0.75,1.),(0.,0.25,0.5,0.75,1.),.UNSPECIFIED.)GEOMETRIC_REPRESENTATION_ITEM()RATIONAL_B_SPLINE_SURFACE(({}))REPRESENTATION_ITEM('')SURFACE())",
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rows.join(","),
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weights.join(",")
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))
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}
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}
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}
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fn placement(&mut self, o: [f64; 3], z: [f64; 3], x: [f64; 3]) -> u64 {
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let (po, dz, dx) = (self.point(o), self.direction(z), self.direction(x));
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self.add_shared(format!("AXIS2_PLACEMENT_3D('',#{po},#{dz},#{dx})"))
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}
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/// Copy a solid entity of a parsed file and everything it uses; returns its new id.
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fn copy_solid(&mut self, ex: &p21::Exchange, root: u64, name: &str) -> std::result::Result<u64, String> {
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let mut map: HashMap<u64, u64> = HashMap::new();
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let seams = horn_seams(ex);
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// Iterative post-order walk (children before parents).
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let mut stack: Vec<(u64, bool)> = vec![(root, false)];
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let mut guard = 0usize;
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while let Some((id, done)) = stack.pop() {
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guard += 1;
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if guard > 50_000_000 {
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return Err("solid too large".into());
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}
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if map.contains_key(&id) {
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continue;
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}
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let e = ex.get(id).ok_or_else(|| format!("missing #{id}"))?;
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// Revolutions with analytic profiles become cylinders, cones, spheres, tori and
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// planes (what other systems recognise), with the face sense corrected.
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if !done
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&& e.name() == "SURFACE_OF_REVOLUTION"
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&& let Some(mut a) = analytic_revolution(ex, e)
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{
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if let AnalyticKind::HornTorus { x, .. } = &mut a.kind
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&& let Some(s) = seams.get(&id)
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{
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*x = *s;
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}
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let new = self.write_analytic(&a);
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if a.flip {
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self.flipped.insert(new);
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}
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map.insert(id, new);
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continue;
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}
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// Flat B-spline sheets are planes; cylindrical ones become cylinders when their
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// pieces were merged into one face (a lone piece stays as written).
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if !done
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&& let Some(a) = planar_bspline(ex, e).map(|kind| Analytic { kind, flip: false }).or_else(|| {
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let seam = self.merged.get(&id)?;
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let mut a = cylindrical_bspline(ex, e)?;
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if let AnalyticKind::Cylinder { x, .. } = &mut a.kind {
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*x = *seam;
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}
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Some(a)
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})
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{
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let new = self.write_analytic(&a);
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if a.flip {
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self.flipped.insert(new);
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}
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map.insert(id, new);
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continue;
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}
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if !done {
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stack.push((id, true));
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let mut refs = Vec::new();
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fn collect(p: &Param, out: &mut Vec<u64>) {
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match p {
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Param::Ref(r) => out.push(*r),
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Param::List(v) | Param::Typed(_, v) => v.iter().for_each(|x| collect(x, out)),
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_ => {}
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}
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}
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e.records.iter().flat_map(|r| &r.params).for_each(|p| collect(p, &mut refs));
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stack.extend(refs.into_iter().filter(|r| !map.contains_key(r)).map(|r| (r, false)));
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continue;
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}
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let mut text = String::new();
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let is_root = id == root;
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if e.is_complex() {
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text.push('(');
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for r in &e.records {
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text.push_str(&r.name);
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text.push('(');
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params(&r.params, &map, &mut text)?;
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text.push(')');
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}
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text.push(')');
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} else {
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// Advanced breps use advanced faces (same attributes as truck's face surfaces).
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let ename = if e.name() == "FACE_SURFACE" { "ADVANCED_FACE" } else { e.name() };
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text.push_str(ename);
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text.push('(');
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let mut ps = e.params().to_vec();
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if is_root && let Some(first) = ps.first_mut() {
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*first = Param::Str(name.to_string());
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}
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// A face on a surface written with the opposite normal flips its sense.
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if ename == "ADVANCED_FACE"
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&& ps.get(2).and_then(Param::as_ref_id).and_then(|g| map.get(&g)).is_some_and(|g| self.flipped.contains(g))
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&& let Some(Param::Enum(sense)) = ps.get_mut(3)
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{
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*sense = if sense == "T" { "F".into() } else { "T".into() };
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}
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params(&ps, &map, &mut text)?;
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text.push(')');
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}
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let topo = TOPOLOGY.contains(&e.name());
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let new = if topo { self.add(text) } else { self.add_shared(text) };
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map.insert(id, new);
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if matches!(e.name(), "FACE_SURFACE" | "ADVANCED_FACE") {
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self.faces_out.insert(id, new);
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}
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}
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map.get(&root).copied().ok_or_else(|| "solid not copied".into())
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}
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}
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/// An analytic surface found behind a surface of revolution.
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#[derive(Clone, Copy)]
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struct Analytic {
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kind: AnalyticKind,
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/// The analytic surface's normal is opposite to the revolution's (ISO 10303-42 normals).
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flip: bool,
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}
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#[derive(Clone, Copy)]
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enum AnalyticKind {
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Plane {
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o: V3,
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z: V3,
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x: V3,
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},
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Cylinder {
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o: V3,
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z: V3,
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x: V3,
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r: f64,
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},
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Cone {
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o: V3,
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z: V3,
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x: V3,
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r: f64,
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angle: f64,
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},
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Sphere {
|
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o: V3,
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z: V3,
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x: V3,
|
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r: f64,
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},
|
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Torus {
|
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o: V3,
|
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z: V3,
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x: V3,
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big: f64,
|
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small: f64,
|
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},
|
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/// A torus whose tube reaches its axis (a horn torus, as a tight sweep makes): no valid
|
||
/// TOROIDAL_SURFACE, so a rational B-spline (tube angle from the pole at the axis, then the
|
||
/// turn from x), as other systems write it. x is the turn's parameter seam.
|
||
HornTorus {
|
||
o: V3,
|
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z: V3,
|
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x: V3,
|
||
big: f64,
|
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small: f64,
|
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},
|
||
}
|
||
|
||
type V3 = [f64; 3];
|
||
|
||
fn sub(a: V3, b: V3) -> V3 {
|
||
[a[0] - b[0], a[1] - b[1], a[2] - b[2]]
|
||
}
|
||
fn add(a: V3, b: V3) -> V3 {
|
||
[a[0] + b[0], a[1] + b[1], a[2] + b[2]]
|
||
}
|
||
fn mul(a: V3, k: f64) -> V3 {
|
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[a[0] * k, a[1] * k, a[2] * k]
|
||
}
|
||
fn dot(a: V3, b: V3) -> f64 {
|
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a[0] * b[0] + a[1] * b[1] + a[2] * b[2]
|
||
}
|
||
fn cross(a: V3, b: V3) -> V3 {
|
||
[a[1] * b[2] - a[2] * b[1], a[2] * b[0] - a[0] * b[2], a[0] * b[1] - a[1] * b[0]]
|
||
}
|
||
fn norm(a: V3) -> f64 {
|
||
dot(a, a).sqrt()
|
||
}
|
||
fn unit(a: V3) -> Option<V3> {
|
||
let n = norm(a);
|
||
(n > 1e-12 && n.is_finite()).then(|| mul(a, 1.0 / n))
|
||
}
|
||
|
||
/// Circle through three points: centre, radius, unit normal.
|
||
fn circle3(a: V3, b: V3, c: V3) -> Option<(V3, f64, V3)> {
|
||
let (ab, ac) = (sub(b, a), sub(c, a));
|
||
let n = cross(ab, ac);
|
||
let n2 = dot(n, n);
|
||
if !(n2 > 1e-24) {
|
||
return None;
|
||
}
|
||
let t = add(mul(cross(n, ab), dot(ac, ac)), mul(cross(ac, n), dot(ab, ab)));
|
||
let center = add(a, mul(t, 0.5 / n2));
|
||
Some((center, norm(sub(a, center)), unit(n)?))
|
||
}
|
||
|
||
/// The analytic surface a surface of revolution is, if its profile is a line or a circular arc
|
||
/// in a plane through the axis.
|
||
fn analytic_revolution(ex: &p21::Exchange, e: &p21::Entity) -> Option<Analytic> {
|
||
use crate::step_in::geom::{self, CurveGeo};
|
||
use truck_modeling::{BoundedCurve, ParametricCurve};
|
||
let cx = crate::step_in::Ctx { ex, len: 1.0, ang: 1.0, tol: 1e-6 };
|
||
let p = e.params();
|
||
let (ao, ad) = geom::axis1(&cx, p.get(2)?.as_ref_id()?).ok()?;
|
||
let (oa, a) = ([ao.x, ao.y, ao.z], [ad.x, ad.y, ad.z]);
|
||
let g = geom::curve(&cx, p.get(1)?.as_ref_id()?, 0).ok()?;
|
||
let radial = |q: V3| {
|
||
let v = sub(q, oa);
|
||
sub(v, mul(a, dot(v, a)))
|
||
};
|
||
let on_axis = |q: V3| add(oa, mul(a, dot(sub(q, oa), a)));
|
||
// Profile samples and tangents.
|
||
let eval: Box<dyn Fn(f64) -> V3> = match &g {
|
||
CurveGeo::Line { p, d } => {
|
||
let (p, d) = ([p.x, p.y, p.z], [d.x, d.y, d.z]);
|
||
Box::new(move |t| add(p, mul(d, t)))
|
||
}
|
||
CurveGeo::BSpline(c) => {
|
||
let c = c.clone();
|
||
let (t0, t1) = c.range_tuple();
|
||
Box::new(move |s| {
|
||
let q = c.subs(t0 + (t1 - t0) * s);
|
||
[q.x, q.y, q.z]
|
||
})
|
||
}
|
||
CurveGeo::Nurbs(c) => {
|
||
let c = c.clone();
|
||
let (t0, t1) = c.range_tuple();
|
||
Box::new(move |s| {
|
||
let q = c.subs(t0 + (t1 - t0) * s);
|
||
[q.x, q.y, q.z]
|
||
})
|
||
}
|
||
CurveGeo::Conic { .. } => return None,
|
||
};
|
||
// A sample point off the axis, its revolution normal (∂S/∂angle × ∂S/∂profile).
|
||
let sample =
|
||
[0.37, 0.61, 0.23, 0.79].into_iter().map(|t| (eval(t), sub(eval(t + 1e-4), eval(t - 1e-4)))).find(|(q, _)| norm(radial(*q)) > 1e-6)?;
|
||
let (q, dq) = sample;
|
||
let n_rev = cross(cross(a, sub(q, oa)), dq);
|
||
let eq = unit(radial(q))?;
|
||
let (kind, n_an) = match &g {
|
||
CurveGeo::Line { d, .. } => {
|
||
let d = unit([d.x, d.y, d.z])?;
|
||
// Coplanar with the axis?
|
||
if dot(cross(d, a), eq).abs() > 1e-9 {
|
||
return None;
|
||
}
|
||
let (da, dr) = (dot(d, a), dot(d, eq));
|
||
if dr.abs() < 1e-12 {
|
||
let r = norm(radial(q));
|
||
(AnalyticKind::Cylinder { o: oa, z: a, x: eq, r }, eq)
|
||
} else if da.abs() < 1e-12 {
|
||
(AnalyticKind::Plane { o: on_axis(q), z: a, x: eq }, a)
|
||
} else {
|
||
// Open the cone along +z: the radius grows that way.
|
||
let z = if dr * da > 0.0 { a } else { mul(a, -1.0) };
|
||
let angle = (dr.abs() / da.abs()).atan();
|
||
let r = norm(radial(q));
|
||
let n = sub(mul(eq, angle.cos()), mul(z, angle.sin()));
|
||
(AnalyticKind::Cone { o: on_axis(q), z, x: eq, r, angle }, n)
|
||
}
|
||
}
|
||
_ => {
|
||
let (c, r, nc) = circle3(eval(0.0), eval(0.5), eval(1.0))?;
|
||
// Every sample on the circle, the circle's plane through the axis.
|
||
if (0..=8).any(|i| (norm(sub(eval(i as f64 / 8.0), c)) - r).abs() > 1e-7 * (1.0 + r)) {
|
||
return None;
|
||
}
|
||
if dot(nc, a).abs() > 1e-9 || dot(sub(c, oa), nc).abs() > 1e-7 * (1.0 + r) {
|
||
return None;
|
||
}
|
||
let big = norm(radial(c));
|
||
if big < 1e-9 * (1.0 + r) {
|
||
(AnalyticKind::Sphere { o: c, z: a, x: eq, r }, sub(q, c))
|
||
} else {
|
||
let ec = unit(radial(c))?;
|
||
let o = on_axis(c);
|
||
if (big - r).abs() <= 1e-6 * (1.0 + r) {
|
||
(AnalyticKind::HornTorus { o, z: a, x: mul(ec, -1.0), big: r, small: r }, sub(q, add(o, mul(eq, r))))
|
||
} else if big < r {
|
||
// A spindle torus (tube crossing the axis) stays a surface of revolution.
|
||
return None;
|
||
} else {
|
||
(AnalyticKind::Torus { o, z: a, x: ec, big, small: r }, sub(q, add(o, mul(eq, big))))
|
||
}
|
||
}
|
||
}
|
||
};
|
||
let flip = dot(n_rev, n_an) < 0.0;
|
||
if !dot(n_rev, n_an).is_finite() || dot(n_rev, n_an).abs() < 1e-12 {
|
||
return None;
|
||
}
|
||
Some(Analytic { kind, flip })
|
||
}
|
||
|
||
/// Two analytic surfaces are the same surface (same kind, frame-independent parameters).
|
||
fn same_analytic(a: &AnalyticKind, b: &AnalyticKind) -> bool {
|
||
let close = |x: f64, y: f64| (x - y).abs() <= 1e-7 * (1.0 + x.abs().max(y.abs()));
|
||
let same_pt = |p: V3, q: V3| norm(sub(p, q)) <= 1e-7 * (1.0 + norm(p));
|
||
let parallel = |p: V3, q: V3| norm(cross(p, q)) <= 1e-9;
|
||
let on_line = |p: V3, o: V3, d: V3| norm(cross(sub(p, o), d)) <= 1e-7 * (1.0 + norm(p));
|
||
match (a, b) {
|
||
(AnalyticKind::Cylinder { o, z, r, .. }, AnalyticKind::Cylinder { o: o2, z: z2, r: r2, .. }) => {
|
||
parallel(*z, *z2) && on_line(*o2, *o, *z) && close(*r, *r2)
|
||
}
|
||
(AnalyticKind::Cone { o, z, r, angle, .. }, AnalyticKind::Cone { o: o2, z: z2, r: r2, angle: a2, .. }) => {
|
||
// Same apex, axis direction and angle.
|
||
let apex = |o: V3, z: V3, r: f64, an: f64| sub(o, mul(z, r / an.tan()));
|
||
dot(*z, *z2) > 1.0 - 1e-9 && close(*angle, *a2) && same_pt(apex(*o, *z, *r, *angle), apex(*o2, *z2, *r2, *a2))
|
||
}
|
||
(AnalyticKind::Sphere { o, r, .. }, AnalyticKind::Sphere { o: o2, r: r2, .. }) => same_pt(*o, *o2) && close(*r, *r2),
|
||
(AnalyticKind::Torus { o, z, big, small, .. }, AnalyticKind::Torus { o: o2, z: z2, big: b2, small: s2, .. }) => {
|
||
same_pt(*o, *o2) && parallel(*z, *z2) && close(*big, *b2) && close(*small, *s2)
|
||
}
|
||
(AnalyticKind::HornTorus { o, z, big, .. }, AnalyticKind::HornTorus { o: o2, z: z2, big: b2, .. }) => {
|
||
same_pt(*o, *o2) && parallel(*z, *z2) && close(*big, *b2)
|
||
}
|
||
(AnalyticKind::Plane { o, z, .. }, AnalyticKind::Plane { o: o2, z: z2, .. }) => {
|
||
parallel(*z, *z2) && dot(sub(*o2, *o), *z).abs() <= 1e-7 * (1.0 + norm(*o))
|
||
}
|
||
_ => false,
|
||
}
|
||
}
|
||
|
||
/// The outward normal sign of a face relative to its analytic surface's normal.
|
||
fn face_normal_sign(a: &AnalyticKind, z_written: V3, flip: bool, sense: bool) -> f64 {
|
||
// Planes compare their written normal directly; the others are always outward-normal kinds.
|
||
let base = match a {
|
||
AnalyticKind::Plane { z, .. } => dot(*z, z_written).signum(),
|
||
_ => 1.0,
|
||
};
|
||
base * if flip != sense { 1.0 } else { -1.0 }
|
||
}
|
||
|
||
/// A B-spline surface that is flat (a sheet swept along a line, as truck makes for extrusions):
|
||
/// the plane with the surface's own normal, so it can be written as a PLANE.
|
||
fn planar_bspline(ex: &p21::Exchange, e: &p21::Entity) -> Option<AnalyticKind> {
|
||
use truck_modeling::{BoundedSurface, ParametricSurface, ParametricSurface3D};
|
||
if !(e.has("B_SPLINE_SURFACE") || e.name() == "B_SPLINE_SURFACE_WITH_KNOTS") {
|
||
return None;
|
||
}
|
||
let cx = crate::step_in::Ctx { ex, len: 1.0, ang: 1.0, tol: 1e-6 };
|
||
let s = crate::step_in::geom::bspline_surface(&cx, e).ok()?;
|
||
let (ctrl, (u0, u1), (v0, v1)) = match &s {
|
||
truck_modeling::Surface::BSplineSurface(b) => {
|
||
(b.control_points().iter().flatten().map(|p| [p.x, p.y, p.z]).collect::<Vec<V3>>(), b.range_tuple().0, b.range_tuple().1)
|
||
}
|
||
truck_modeling::Surface::NurbsSurface(n) => {
|
||
let pts = n.non_rationalized().control_points().iter().flatten().map(|p| [p.x / p.w, p.y / p.w, p.z / p.w]).collect::<Vec<V3>>();
|
||
let (ru, rv) = n.range_tuple();
|
||
(pts, ru, rv)
|
||
}
|
||
_ => return None,
|
||
};
|
||
let (um, vm) = ((u0 + u1) / 2.0, (v0 + v1) / 2.0);
|
||
let n = s.normal(um, vm);
|
||
let z = unit([n.x, n.y, n.z])?;
|
||
let o = s.subs(um, vm);
|
||
let o = [o.x, o.y, o.z];
|
||
let du = s.uder(um, vm);
|
||
let x = unit(sub([du.x, du.y, du.z], mul(z, dot([du.x, du.y, du.z], z))))?;
|
||
let size = ctrl.iter().map(|p| norm(sub(*p, o))).fold(0.0, f64::max);
|
||
// Every control point on the plane (a flat net gives a flat surface, rational or not).
|
||
if ctrl.iter().any(|p| dot(sub(*p, o), z).abs() > 1e-9 * (1.0 + size)) {
|
||
return None;
|
||
}
|
||
Some(AnalyticKind::Plane { o, z, x })
|
||
}
|
||
|
||
/// A B-spline surface that is a circular cylinder (a circle or arc swept along a line, as truck
|
||
/// makes for extruded round profiles), with its normal direction relative to the cylinder's
|
||
/// outward normal.
|
||
fn cylindrical_bspline(ex: &p21::Exchange, e: &p21::Entity) -> Option<Analytic> {
|
||
use truck_modeling::{ParametricSurface, ParametricSurface3D};
|
||
if !(e.has("B_SPLINE_SURFACE") || e.name() == "B_SPLINE_SURFACE_WITH_KNOTS") {
|
||
return None;
|
||
}
|
||
let cx = crate::step_in::Ctx { ex, len: 1.0, ang: 1.0, tol: 1e-6 };
|
||
let s = crate::step_in::geom::bspline_surface(&cx, e).ok()?;
|
||
let (Some((u0, u1)), Some((v0, v1))) = s.try_range_tuple() else { return None };
|
||
let at = |u: f64, v: f64| {
|
||
let p = s.subs(u, v);
|
||
[p.x, p.y, p.z]
|
||
};
|
||
// Which parameter sweeps along a line: the same translation from one end to the other at
|
||
// every point of the profile.
|
||
for along_v in [true, false] {
|
||
let point = |t: f64, w: f64| if along_v { at(u0 + (u1 - u0) * t, v0 + (v1 - v0) * w) } else { at(u0 + (u1 - u0) * w, v0 + (v1 - v0) * t) };
|
||
let prof: Vec<V3> = (0..=8).map(|k| point(k as f64 / 8.0, 0.0)).collect();
|
||
let d = sub(point(0.0, 1.0), point(0.0, 0.0));
|
||
let len = norm(d);
|
||
let scale = prof.iter().map(|p| norm(sub(*p, prof[0]))).fold(len, f64::max);
|
||
let tol = 1e-7 * (1.0 + scale);
|
||
if len < tol
|
||
|| (0..=8).any(|k| {
|
||
let t = k as f64 / 8.0;
|
||
(0..=4).any(|m| norm(sub(sub(point(t, m as f64 / 4.0), point(t, 0.0)), mul(d, m as f64 / 4.0))) > tol)
|
||
})
|
||
{
|
||
continue;
|
||
}
|
||
let (Some(&a), Some(&b), Some(&c)) = (prof.first(), prof.get(4), prof.get(8)) else { continue };
|
||
let (centre, r, n) = circle3(a, b, c).or_else(|| circle3(a, prof[2], b))?;
|
||
let z = unit(d)?;
|
||
if norm(cross(n, z)) > 1e-7 || prof.iter().any(|p| (norm(sub(*p, centre)) - r).abs() > tol) {
|
||
return None;
|
||
}
|
||
// The surface's own normal against the outward one, mid-face.
|
||
let (um, vm) = ((u0 + u1) / 2.0, (v0 + v1) / 2.0);
|
||
let nn = s.normal(um, vm);
|
||
let q = at(um, vm);
|
||
let radial = sub(sub(q, centre), mul(z, dot(sub(q, centre), z)));
|
||
let flip = dot([nn.x, nn.y, nn.z], radial) < 0.0;
|
||
// The parameter seam opposite the middle of the sheet, away from its edges.
|
||
let x = unit(mul(radial, -1.0)).or_else(|| unit(sub(a, centre)))?;
|
||
return Some(Analytic { kind: AnalyticKind::Cylinder { o: centre, z, x, r }, flip });
|
||
}
|
||
None
|
||
}
|
||
|
||
/// A B-spline surface that is really a plane or a cylinder.
|
||
fn analytic_bspline(ex: &p21::Exchange, e: &p21::Entity) -> Option<Analytic> {
|
||
planar_bspline(ex, e).map(|kind| Analytic { kind, flip: false }).or_else(|| cylindrical_bspline(ex, e))
|
||
}
|
||
|
||
/// Points along an edge's curve (its ends for a line, None for a conic it cannot sample).
|
||
fn edge_samples(ex: &p21::Exchange, edge: u64) -> Option<Vec<V3>> {
|
||
use truck_modeling::{BoundedCurve, ParametricCurve};
|
||
let p = ex.get(edge)?.params();
|
||
let ends = [vertex_point(ex, p.get(1)?.as_ref_id()?)?, vertex_point(ex, p.get(2)?.as_ref_id()?)?];
|
||
let cx = crate::step_in::Ctx { ex, len: 1.0, ang: 1.0, tol: 1e-6 };
|
||
let sample = |f: &dyn Fn(f64) -> truck_modeling::Point3, (t0, t1): (f64, f64)| {
|
||
(0..=4).map(|k| f(t0 + (t1 - t0) * k as f64 / 4.0)).map(|q| [q.x, q.y, q.z]).collect::<Vec<V3>>()
|
||
};
|
||
match crate::step_in::geom::curve(&cx, p.get(3)?.as_ref_id()?, 0).ok()? {
|
||
crate::step_in::geom::CurveGeo::Line { .. } => Some(ends.to_vec()),
|
||
crate::step_in::geom::CurveGeo::BSpline(c) => Some(sample(&|t| c.subs(t), c.range_tuple())),
|
||
crate::step_in::geom::CurveGeo::Nurbs(c) => Some(sample(&|t| c.subs(t), c.range_tuple())),
|
||
crate::step_in::geom::CurveGeo::Conic { .. } => None,
|
||
}
|
||
}
|
||
|
||
fn vertex_point(ex: &p21::Exchange, v: u64) -> Option<V3> {
|
||
let p = ex.get(ex.get(v)?.params().get(1)?.as_ref_id()?)?;
|
||
let c = p.params().get(1)?.as_list()?;
|
||
Some([c.first()?.as_f64()?, c.get(1)?.as_f64()?, c.get(2)?.as_f64()?])
|
||
}
|
||
|
||
/// For each horn torus revolution, a turn direction away from its faces (the B-spline's
|
||
/// parameter seam must not cross them): opposite their vertices' mean direction about the axis.
|
||
fn horn_seams(ex: &p21::Exchange) -> HashMap<u64, V3> {
|
||
let mut out = HashMap::new();
|
||
for fe in ex.entities.values() {
|
||
if !matches!(fe.name(), "FACE_SURFACE" | "ADVANCED_FACE") {
|
||
continue;
|
||
}
|
||
let Some(sid) = fe.params().get(2).and_then(Param::as_ref_id) else { continue };
|
||
let Some(se) = ex.get(sid).filter(|e| e.name() == "SURFACE_OF_REVOLUTION") else { continue };
|
||
let Some(Analytic { kind: AnalyticKind::HornTorus { o, z, .. }, .. }) = analytic_revolution(ex, se) else { continue };
|
||
let Some(loops) = face_edges(ex, fe) else { continue };
|
||
let mut mean = [0.0; 3];
|
||
for (e, _) in loops.iter().flatten() {
|
||
for k in [1, 2] {
|
||
let Some(q) = ex.get(*e).and_then(|e| e.params().get(k)).and_then(Param::as_ref_id).and_then(|v| vertex_point(ex, v)) else {
|
||
continue;
|
||
};
|
||
let v = sub(q, o);
|
||
if let Some(r) = unit(sub(v, mul(z, dot(v, z)))) {
|
||
mean = add(mean, r);
|
||
}
|
||
}
|
||
}
|
||
if let Some(m) = unit(mean) {
|
||
out.insert(sid, mul(m, -1.0));
|
||
}
|
||
}
|
||
out
|
||
}
|
||
|
||
/// Zero-length edges (truck sweeps a profile point on the axis into one) removed and their
|
||
/// vertices joined: other systems reject a pole written as an ordinary edge.
|
||
fn collapse_short_edges(ex: &mut p21::Exchange) {
|
||
let ends = |e: &p21::Entity| Some((e.params().get(1)?.as_ref_id()?, e.params().get(2)?.as_ref_id()?));
|
||
let mut join: HashMap<u64, u64> = HashMap::new();
|
||
let mut dead = std::collections::HashSet::new();
|
||
let mut ids: Vec<u64> = ex.entities.iter().filter(|(_, e)| e.name() == "EDGE_CURVE").map(|(i, _)| *i).collect();
|
||
ids.sort();
|
||
for id in ids {
|
||
let Some(e) = ex.get(id) else { continue };
|
||
let Some((a, b)) = ends(e) else { continue };
|
||
let (Some(pa), Some(pb)) = (vertex_point(ex, a), vertex_point(ex, b)) else { continue };
|
||
if a == b || norm(sub(pa, pb)) > 1e-6 * (1.0 + norm(pa)) {
|
||
continue;
|
||
}
|
||
// The curve itself must be short too (not a whole circle between two coincident vertices).
|
||
let short = e.params().get(3).and_then(Param::as_ref_id).and_then(|c| {
|
||
use truck_modeling::{BoundedCurve, ParametricCurve};
|
||
let cx = crate::step_in::Ctx { ex, len: 1.0, ang: 1.0, tol: 1e-6 };
|
||
let mid = match crate::step_in::geom::curve(&cx, c, 0).ok()? {
|
||
crate::step_in::geom::CurveGeo::Line { .. } => return Some(true),
|
||
crate::step_in::geom::CurveGeo::BSpline(c) => c.subs((c.range_tuple().0 + c.range_tuple().1) / 2.0),
|
||
crate::step_in::geom::CurveGeo::Nurbs(c) => c.subs((c.range_tuple().0 + c.range_tuple().1) / 2.0),
|
||
crate::step_in::geom::CurveGeo::Conic { .. } => return Some(false),
|
||
};
|
||
Some(norm(sub([mid.x, mid.y, mid.z], pa)) <= 1e-6 * (1.0 + norm(pa)))
|
||
});
|
||
if short != Some(true) {
|
||
continue;
|
||
}
|
||
let find = |join: &HashMap<u64, u64>, mut v: u64| {
|
||
while let Some(n) = join.get(&v) {
|
||
v = *n;
|
||
}
|
||
v
|
||
};
|
||
let (ra, rb) = (find(&join, a), find(&join, b));
|
||
if ra != rb {
|
||
join.insert(rb, ra);
|
||
}
|
||
dead.insert(id);
|
||
}
|
||
if dead.is_empty() {
|
||
return;
|
||
}
|
||
// A loop made only of such edges (a pole loop) keeps them all.
|
||
let oe_edge = |ex: &p21::Exchange, oe: &Param| oe.as_ref_id().and_then(|o| ex.get(o)).and_then(|o| o.params().get(3)).and_then(Param::as_ref_id);
|
||
let loops: Vec<u64> = ex.entities.iter().filter(|(_, e)| e.name() == "EDGE_LOOP").map(|(i, _)| *i).collect();
|
||
for l in &loops {
|
||
let Some(list) = ex.get(*l).and_then(|e| e.params().get(1)).and_then(Param::as_list) else { continue };
|
||
if list.iter().all(|oe| oe_edge(ex, oe).is_some_and(|e| dead.contains(&e))) {
|
||
return;
|
||
}
|
||
}
|
||
for l in loops {
|
||
let Some(list) = ex.get(l).and_then(|e| e.params().get(1)).and_then(Param::as_list) else { continue };
|
||
let kept: Vec<Param> = list.iter().filter(|oe| !oe_edge(ex, oe).is_some_and(|e| dead.contains(&e))).cloned().collect();
|
||
if let Some(r) = ex.entities.get_mut(&l).and_then(|e| e.records.first_mut())
|
||
&& let Some(slot) = r.params.get_mut(1)
|
||
{
|
||
*slot = Param::List(kept);
|
||
}
|
||
}
|
||
let find = |mut v: u64| {
|
||
while let Some(n) = join.get(&v) {
|
||
v = *n;
|
||
}
|
||
v
|
||
};
|
||
for e in ex.entities.values_mut() {
|
||
if e.name() != "EDGE_CURVE" {
|
||
continue;
|
||
}
|
||
if let Some(r) = e.records.first_mut() {
|
||
for k in [1, 2] {
|
||
if let Some(slot) = r.params.get_mut(k)
|
||
&& let Some(v) = slot.as_ref_id()
|
||
{
|
||
*slot = Param::Ref(find(v));
|
||
}
|
||
}
|
||
}
|
||
}
|
||
}
|
||
|
||
/// Oriented edges (edge id, forward) of a face's bounds.
|
||
fn face_edges(ex: &p21::Exchange, face: &p21::Entity) -> Option<Vec<Vec<(u64, bool)>>> {
|
||
let mut loops = Vec::new();
|
||
for b in face.params().get(1)?.as_list()? {
|
||
let fb = ex.get(b.as_ref_id()?)?;
|
||
let lp = ex.get(fb.params().get(1)?.as_ref_id()?)?;
|
||
if lp.name() != "EDGE_LOOP" {
|
||
return None;
|
||
}
|
||
let orient = fb.params().get(2)?.as_bool()?;
|
||
let mut v = Vec::new();
|
||
for oe in lp.params().get(1)?.as_list()? {
|
||
let oe = ex.get(oe.as_ref_id()?)?;
|
||
if oe.name() != "ORIENTED_EDGE" {
|
||
return None;
|
||
}
|
||
v.push((oe.params().get(3)?.as_ref_id()?, oe.params().get(4)?.as_bool()?));
|
||
}
|
||
if !orient {
|
||
v.reverse();
|
||
v.iter_mut().for_each(|e| e.1 = !e.1);
|
||
}
|
||
loops.push(v);
|
||
}
|
||
Some(loops)
|
||
}
|
||
|
||
/// Faces that truck splits (a revolution in two or three turns) joined back into one face per
|
||
/// analytic surface, by dropping the edges between them. Faces whose union would lose all its
|
||
/// edges, or whose leftover edges do not close into loops, stay apart.
|
||
fn merge_split_faces(ex: &mut p21::Exchange, paint: &mut HashMap<u64, FaceLook>, keep: &[Vec<Vec3>]) -> HashMap<u64, V3> {
|
||
// An edge on a line the user split along: every sample within a hair of the polyline.
|
||
let on_split = |ex: &p21::Exchange, e: u64| -> bool {
|
||
let Some(pts) = edge_samples(ex, e) else { return false };
|
||
let pts: Vec<Vec3> = pts.iter().map(|q| Vec3::new(q[0], q[1], q[2])).collect();
|
||
crate::heal::on_split_line(&pts, keep)
|
||
};
|
||
let mut merged_surfaces = std::collections::HashSet::new();
|
||
let mut next = ex.entities.keys().max().copied().unwrap_or(0) + 1;
|
||
let shells: Vec<u64> = ex.entities.iter().filter(|(_, e)| matches!(e.name(), "CLOSED_SHELL" | "OPEN_SHELL")).map(|(i, _)| *i).collect();
|
||
// Each surface's analytic form, worked out once (merged faces keep a piece's surface).
|
||
let mut cache: HashMap<u64, Option<Analytic>> = HashMap::new();
|
||
for sh in shells {
|
||
for _round in 0..64 {
|
||
let Some(faces) = ex
|
||
.get(sh)
|
||
.and_then(|e| e.params().get(1))
|
||
.and_then(Param::as_list)
|
||
.map(|l| l.iter().filter_map(Param::as_ref_id).collect::<Vec<u64>>())
|
||
else {
|
||
break;
|
||
};
|
||
// Analytic description and normal sign of each face on a revolution.
|
||
let info: Vec<Option<(AnalyticKind, f64)>> = faces
|
||
.iter()
|
||
.map(|f| {
|
||
let fe = ex.get(*f)?;
|
||
if !matches!(fe.name(), "FACE_SURFACE" | "ADVANCED_FACE") {
|
||
return None;
|
||
}
|
||
let sid = fe.params().get(2)?.as_ref_id()?;
|
||
let an = (*cache.entry(sid).or_insert_with(|| {
|
||
let se = ex.get(sid)?;
|
||
match se.name() {
|
||
"SURFACE_OF_REVOLUTION" => analytic_revolution(ex, se),
|
||
// Coplanar pieces (a face split where a mirrored half was glued on).
|
||
"PLANE" => {
|
||
let cx = crate::step_in::Ctx { ex, len: 1.0, ang: 1.0, tol: 1e-6 };
|
||
let f = crate::step_in::geom::frame(&cx, se.params().get(1)?.as_ref_id()?).ok()?;
|
||
let v = |a: truck_modeling::Vector3| [a.x, a.y, a.z];
|
||
Some(Analytic { kind: AnalyticKind::Plane { o: [f.o.x, f.o.y, f.o.z], z: v(f.z), x: v(f.x) }, flip: false })
|
||
}
|
||
_ => analytic_bspline(ex, se).filter(|a| match a.kind {
|
||
// Pieces of a B-spline cylinder merge only when their curved edges
|
||
// are circles square to the axis (an extruded hole): crossing
|
||
// curves (a hole through a tube wall) read far more slowly on a
|
||
// cylinder than on the sheet they came with.
|
||
AnalyticKind::Cylinder { z, .. } => face_edges(ex, fe).is_some_and(|ls| {
|
||
ls.iter().flatten().all(|(x, _)| {
|
||
edge_samples(ex, *x).is_some_and(|pts| {
|
||
let Some(&q0) = pts.first() else { return false };
|
||
let tol = 1e-7 * (1.0 + norm(q0));
|
||
pts.iter().all(|q| dot(sub(*q, q0), z).abs() <= tol)
|
||
|| pts.iter().all(|q| norm(cross(sub(*q, q0), z)) <= tol)
|
||
})
|
||
})
|
||
}),
|
||
_ => true,
|
||
}),
|
||
}
|
||
}))?;
|
||
let sense = fe.params().get(3)?.as_bool()?;
|
||
let z = match an.kind {
|
||
AnalyticKind::Plane { z, .. } => z,
|
||
_ => [0.0; 3],
|
||
};
|
||
let sign = face_normal_sign(&an.kind, z, an.flip, sense);
|
||
// Planes: normalise to one written direction for comparisons.
|
||
Some((an.kind, sign))
|
||
})
|
||
.collect();
|
||
let mut merged = false;
|
||
'pairs: for i in 0..faces.len() {
|
||
for j in (i + 1)..faces.len() {
|
||
let (Some(Some((ka, sa))), Some(Some((kb, sb)))) = (info.get(i), info.get(j)) else { continue };
|
||
if !same_analytic(ka, kb) {
|
||
continue;
|
||
}
|
||
let plane_dir = |k: &AnalyticKind| match k {
|
||
AnalyticKind::Plane { z, .. } => *z,
|
||
_ => [0.0, 0.0, 1.0],
|
||
};
|
||
let (na, nb) = (mul(plane_dir(ka), *sa), mul(plane_dir(kb), *sb));
|
||
if dot(na, nb) <= 0.0 {
|
||
continue;
|
||
}
|
||
let (Some(&fa), Some(&fb)) = (faces.get(i), faces.get(j)) else { continue };
|
||
// Faces of different colours stay apart.
|
||
if paint.get(&fa) != paint.get(&fb) {
|
||
continue;
|
||
}
|
||
let (Some(ea), Some(eb)) = (ex.get(fa).and_then(|f| face_edges(ex, f)), ex.get(fb).and_then(|f| face_edges(ex, f))) else {
|
||
continue;
|
||
};
|
||
let all: Vec<(u64, bool)> = ea.into_iter().chain(eb).flatten().collect();
|
||
let shared: std::collections::HashSet<u64> =
|
||
all.iter().filter(|(e, d)| all.iter().any(|(e2, d2)| e2 == e && d2 != d)).map(|(e, _)| *e).collect();
|
||
if shared.is_empty() || shared.iter().any(|e| on_split(ex, *e)) {
|
||
continue;
|
||
}
|
||
// Chain oriented edges into loops by vertices (None: they do not close).
|
||
let ends = |(e, d): (u64, bool)| -> Option<(u64, u64)> {
|
||
let p = ex.get(e)?.params();
|
||
let (s0, s1) = (p.get(1)?.as_ref_id()?, p.get(2)?.as_ref_id()?);
|
||
Some(if d { (s0, s1) } else { (s1, s0) })
|
||
};
|
||
let chain = |mut pool: Vec<(u64, bool)>| -> Option<Vec<Vec<(u64, bool)>>> {
|
||
let mut loops = Vec::new();
|
||
while let Some(first) = pool.pop() {
|
||
let (start, mut at) = ends(first)?;
|
||
let mut lp = vec![first];
|
||
while at != start {
|
||
if lp.len() > 100_000 {
|
||
return None;
|
||
}
|
||
let k = pool.iter().position(|x| ends(*x).is_some_and(|(s, _)| s == at))?;
|
||
let x = pool.remove(k);
|
||
at = ends(x)?.1;
|
||
lp.push(x);
|
||
}
|
||
loops.push(lp);
|
||
}
|
||
Some(loops)
|
||
};
|
||
// A full turn keeps one shared edge as the face's seam, used both ways (as other
|
||
// systems write cylinders and cone tips); otherwise the shared edges go.
|
||
// (A horn torus band needs no seam: its rings meet at the pole.)
|
||
let mut loops = None;
|
||
if shared.len() >= 2 && !matches!(ka, AnalyticKind::HornTorus { .. } | AnalyticKind::Plane { .. }) {
|
||
// Without the shared edges: one ring (a cone tip) or two (a band). The seam
|
||
// runs from a vertex on the first ring to the second ring (or the apex) and
|
||
// back: ring A, seam, ring B, seam reversed.
|
||
let rest: Vec<(u64, bool)> = all.iter().copied().filter(|(e, _)| !shared.contains(e)).collect();
|
||
if let Some(rings) = chain(rest).filter(|r| matches!(r.len(), 1 | 2)) {
|
||
let starts_at = |ring: &Vec<(u64, bool)>, v: u64| ring.iter().position(|x| ends(*x).is_some_and(|(a, _)| a == v));
|
||
let on_axis = |v: u64| {
|
||
let (o, z) = match ka {
|
||
AnalyticKind::Cone { o, z, .. } | AnalyticKind::Sphere { o, z, .. } => (*o, *z),
|
||
_ => return false,
|
||
};
|
||
vertex_point(ex, v).is_some_and(|q| norm(cross(sub(q, o), z)) <= 1e-6 * (1.0 + norm(q)))
|
||
};
|
||
let rotated =
|
||
|ring: &Vec<(u64, bool)>, k: usize| ring.iter().skip(k).chain(ring.iter().take(k)).copied().collect::<Vec<_>>();
|
||
let mut cands: Vec<u64> = shared.iter().copied().collect();
|
||
cands.sort();
|
||
'seam: for keep in cands {
|
||
for &(e, d) in all.iter().filter(|(e, _)| *e == keep) {
|
||
let Some((a, b)) = ends((e, d)) else { continue };
|
||
let (Some(ra), Some(ka0)) = (rings.first(), rings.first().and_then(|r| starts_at(r, a))) else { continue };
|
||
let mut lp = rotated(ra, ka0);
|
||
lp.push((e, d));
|
||
match rings.get(1) {
|
||
Some(rb) => {
|
||
let Some(kb) = starts_at(rb, b) else { continue };
|
||
lp.extend(rotated(rb, kb));
|
||
}
|
||
// A cone tip (or a sphere's pole cap): the seam's far end is
|
||
// the apex on the axis, off the ring.
|
||
None if starts_at(ra, b).is_none() && on_axis(b) => {}
|
||
None => continue,
|
||
}
|
||
lp.push((e, !d));
|
||
loops = Some(vec![lp]);
|
||
break 'seam;
|
||
}
|
||
}
|
||
}
|
||
}
|
||
let planar = matches!(ka, AnalyticKind::Plane { .. });
|
||
if loops.is_none() && planar {
|
||
// A plane needs no seam: an annulus keeps its two rings, a face with a hole
|
||
// its hole. The largest loop goes first (the outer bound).
|
||
let rest: Vec<(u64, bool)> = all.iter().copied().filter(|(e, _)| !shared.contains(e)).collect();
|
||
loops = chain(rest).map(|mut l| {
|
||
let size = |lp: &Vec<(u64, bool)>| {
|
||
let pts: Vec<V3> = lp.iter().filter_map(|x| ends(*x).and_then(|(a, _)| vertex_point(ex, a))).collect();
|
||
let mut lo = [f64::INFINITY; 3];
|
||
let mut hi = [f64::NEG_INFINITY; 3];
|
||
for p in &pts {
|
||
for k in 0..3 {
|
||
lo[k] = lo[k].min(p[k]);
|
||
hi[k] = hi[k].max(p[k]);
|
||
}
|
||
}
|
||
norm(sub(hi, lo))
|
||
};
|
||
l.sort_by(|a, b| size(b).total_cmp(&size(a)));
|
||
l
|
||
});
|
||
}
|
||
if loops.is_none() && !planar {
|
||
let rest: Vec<(u64, bool)> = all.iter().copied().filter(|(e, _)| !shared.contains(e)).collect();
|
||
loops = chain(rest)
|
||
.map(|mut l| {
|
||
// Rings meeting at a vertex (both ends of a horn torus band meet at
|
||
// its pole) form one figure-eight loop through it.
|
||
while l.len() > 1 {
|
||
let Some(second) = l.pop() else { break };
|
||
let at = l.iter().enumerate().find_map(|(li, lp)| {
|
||
lp.iter().enumerate().find_map(|(k, x)| {
|
||
let v = ends(*x)?.1;
|
||
let s = second.iter().position(|y| ends(*y).is_some_and(|(a, _)| a == v))?;
|
||
Some((li, k, s))
|
||
})
|
||
});
|
||
let Some((li, k, s)) = at else {
|
||
l.push(second);
|
||
break;
|
||
};
|
||
let mut second = second;
|
||
second.rotate_left(s);
|
||
if let Some(lp) = l.get_mut(li) {
|
||
for (n, x) in second.into_iter().enumerate() {
|
||
lp.insert(k + 1 + n, x);
|
||
}
|
||
}
|
||
}
|
||
l
|
||
})
|
||
.filter(|l| l.len() == 1);
|
||
}
|
||
let Some(loops) = loops else { continue };
|
||
// A loop of seams only (a whole sphere) bounds nothing: keep the faces apart.
|
||
if loops.iter().all(|l| l.iter().all(|(e, _)| l.iter().filter(|(e2, _)| e2 == e).count() > 1)) {
|
||
continue;
|
||
}
|
||
// Write the merged face.
|
||
let mut bounds = Vec::new();
|
||
for lp in loops {
|
||
let mut oes = Vec::new();
|
||
for (e, d) in lp {
|
||
let id = next;
|
||
next += 1;
|
||
ex.entities.insert(
|
||
id,
|
||
p21::Entity {
|
||
records: vec![p21::Record {
|
||
name: "ORIENTED_EDGE".into(),
|
||
params: vec![
|
||
Param::Str(String::new()),
|
||
Param::Derived,
|
||
Param::Derived,
|
||
Param::Ref(e),
|
||
Param::Enum(if d { "T" } else { "F" }.into()),
|
||
],
|
||
}],
|
||
},
|
||
);
|
||
oes.push(Param::Ref(id));
|
||
}
|
||
let lid = next;
|
||
next += 1;
|
||
ex.entities.insert(
|
||
lid,
|
||
p21::Entity {
|
||
records: vec![p21::Record { name: "EDGE_LOOP".into(), params: vec![Param::Str(String::new()), Param::List(oes)] }],
|
||
},
|
||
);
|
||
let bid = next;
|
||
next += 1;
|
||
ex.entities.insert(
|
||
bid,
|
||
p21::Entity {
|
||
records: vec![p21::Record {
|
||
name: "FACE_BOUND".into(),
|
||
params: vec![Param::Str(String::new()), Param::Ref(lid), Param::Enum("T".into())],
|
||
}],
|
||
},
|
||
);
|
||
bounds.push(Param::Ref(bid));
|
||
}
|
||
let Some(old) = ex.get(fa).cloned() else { continue };
|
||
let mut params = old.params().to_vec();
|
||
if let Some(slot) = params.get_mut(1) {
|
||
*slot = Param::List(bounds);
|
||
}
|
||
let nid = next;
|
||
next += 1;
|
||
if let Some(sid) = params.get(2).and_then(Param::as_ref_id) {
|
||
merged_surfaces.insert(sid);
|
||
}
|
||
ex.entities.insert(nid, p21::Entity { records: vec![p21::Record { name: old.name().to_string(), params }] });
|
||
if let Some(look) = paint.remove(&fa) {
|
||
paint.remove(&fb);
|
||
paint.insert(nid, look);
|
||
}
|
||
let new_list: Vec<Param> = faces.iter().filter(|f| **f != fb).map(|f| Param::Ref(if *f == fa { nid } else { *f })).collect();
|
||
if let Some(she) = ex.entities.get_mut(&sh)
|
||
&& let Some(r) = she.records.first_mut()
|
||
&& let Some(slot) = r.params.get_mut(1)
|
||
{
|
||
*slot = Param::List(new_list);
|
||
}
|
||
merged = true;
|
||
break 'pairs;
|
||
}
|
||
}
|
||
if !merged {
|
||
break;
|
||
}
|
||
}
|
||
}
|
||
// B-spline cylinder sheets under merged faces are written as cylinders (the sheet covers only
|
||
// its own piece), with the parameter seam on the face's seam edge for a full turn, else
|
||
// opposite the face's middle. (Faces replaced by merges stay in the exchange unreferenced:
|
||
// only the shells' faces count.)
|
||
let live: Vec<u64> = ex
|
||
.entities
|
||
.values()
|
||
.filter_map(|e| if matches!(e.name(), "CLOSED_SHELL" | "OPEN_SHELL") { e.params().get(1).and_then(Param::as_list) } else { None })
|
||
.flatten()
|
||
.filter_map(Param::as_ref_id)
|
||
.collect();
|
||
let mut out = HashMap::new();
|
||
for e in live.iter().filter_map(|f| ex.get(*f)) {
|
||
let Some(sid) = e.params().get(2).and_then(Param::as_ref_id) else { continue };
|
||
if !merged_surfaces.contains(&sid) || out.contains_key(&sid) {
|
||
continue;
|
||
}
|
||
let Some(Analytic { kind: AnalyticKind::Cylinder { o, z, .. }, .. }) = ex.get(sid).and_then(|se| cylindrical_bspline(ex, se)) else {
|
||
continue;
|
||
};
|
||
let Some(loops) = face_edges(ex, e) else { continue };
|
||
let radial = |q: V3| {
|
||
let v = sub(q, o);
|
||
sub(v, mul(z, dot(v, z)))
|
||
};
|
||
let seam = loops
|
||
.iter()
|
||
.flat_map(|l| l.iter().map(move |(x, _)| (l, *x)))
|
||
.find(|(l, x)| l.iter().filter(|(y, _)| y == x).count() > 1)
|
||
.map(|(_, x)| x);
|
||
let x = match seam.and_then(|edge| ex.get(edge)?.params().get(1)?.as_ref_id()).and_then(|v| vertex_point(ex, v)) {
|
||
Some(q) => unit(radial(q)),
|
||
None => {
|
||
let mean = loops
|
||
.iter()
|
||
.flatten()
|
||
.filter_map(|(edge, _)| ex.get(*edge)?.params().get(1)?.as_ref_id())
|
||
.filter_map(|v| vertex_point(ex, v))
|
||
.filter_map(|q| unit(radial(q)))
|
||
.fold([0.0; 3], add);
|
||
unit(mul(mean, -1.0))
|
||
}
|
||
};
|
||
if let Some(x) = x {
|
||
out.insert(sid, x);
|
||
}
|
||
}
|
||
out
|
||
}
|
||
|
||
/// The B-rep entities of one body as truck writes them, parsed, and the surfaces of faces
|
||
/// merged from pieces.
|
||
fn brep_exchange(b: &Body, merge: bool) -> Result<(p21::Exchange, HashMap<u64, V3>, HashMap<u64, FaceLook>)> {
|
||
let text = crate::step::truck_step(&[b], "SolidCraft")?;
|
||
let mut ex = p21::parse(&text).map_err(|e| KernelError::Failed(format!("STEP export: {e}")))?;
|
||
collapse_short_edges(&mut ex);
|
||
// Face colours by exchange face: truck writes each shell's faces in the body's face order.
|
||
let mut paint = HashMap::new();
|
||
if let Some(p) = b.paint()
|
||
&& !p.faces.is_empty()
|
||
{
|
||
let mut shells: Vec<u64> = ex.entities.iter().filter(|(_, e)| matches!(e.name(), "CLOSED_SHELL" | "OPEN_SHELL")).map(|(i, _)| *i).collect();
|
||
shells.sort();
|
||
let faces: Vec<u64> = shells.iter().filter_map(|s| ex.get(*s)?.params().get(1)?.as_list()).flatten().filter_map(Param::as_ref_id).collect();
|
||
for f in &p.faces {
|
||
if let Some(id) = faces.get(f.face) {
|
||
paint.insert(*id, (f.color, f.opacity));
|
||
}
|
||
}
|
||
}
|
||
let before = shell_face_count(&ex);
|
||
let keep = b.split_lines().map(|l| l.as_slice()).unwrap_or(&[]);
|
||
let merged = if merge { merge_split_faces(&mut ex, &mut paint, keep) } else { Default::default() };
|
||
MERGES.with(|m| m.set(m.get() + before.saturating_sub(shell_face_count(&ex))));
|
||
Ok((ex, merged, paint))
|
||
}
|
||
|
||
/// The separate pieces of a body for export, each keeping its face colours: a body of several
|
||
/// lumps (a plate and the islands a cut left inside its holes, such as letter counters) is
|
||
/// several solids, never one solid whose other pieces are written as voids. A body in one
|
||
/// piece, or one whose pieces cannot be told apart, is itself.
|
||
fn export_lumps(b: &Body) -> Vec<Body> {
|
||
if b.mesh.is_some() || b.solid.boundaries().len() < 2 {
|
||
return vec![b.clone()];
|
||
}
|
||
let lumps = match b.lumps() {
|
||
Ok(l) if l.len() > 1 => l,
|
||
_ => return vec![b.clone()],
|
||
};
|
||
let index: HashMap<_, usize> = b.solid.face_iter().enumerate().map(|(i, f)| (f.id(), i)).collect();
|
||
lumps
|
||
.into_iter()
|
||
.map(|lump| {
|
||
let paint = b.paint().map(|p| crate::body::Paint {
|
||
opacity: p.opacity,
|
||
faces: lump
|
||
.solid
|
||
.face_iter()
|
||
.enumerate()
|
||
.filter_map(|(k, f)| {
|
||
let i = index.get(&f.id())?;
|
||
p.faces.iter().find(|fp| fp.face == *i).map(|fp| crate::body::FacePaint { face: k, ..fp.clone() })
|
||
})
|
||
.collect(),
|
||
});
|
||
lump.with_color(b.color()).with_split_lines(b.split_lines().cloned()).with_paint(paint)
|
||
})
|
||
.collect()
|
||
}
|
||
|
||
/// Faces in the exchange's shells (fewer after merging).
|
||
fn shell_face_count(ex: &p21::Exchange) -> usize {
|
||
ex.entities
|
||
.values()
|
||
.filter(|e| matches!(e.name(), "CLOSED_SHELL" | "OPEN_SHELL"))
|
||
.filter_map(|e| e.params().get(1).and_then(Param::as_list))
|
||
.map(<[Param]>::len)
|
||
.sum()
|
||
}
|
||
|
||
/// A face's own colour (0..1) and opacity.
|
||
type FaceLook = ([f32; 3], f32);
|
||
|
||
fn rigid_frame(m: &[[f64; 4]; 4]) -> Result<([f64; 3], [f64; 3], [f64; 3])> {
|
||
let x = [m[0][0], m[0][1], m[0][2]];
|
||
let y = [m[1][0], m[1][1], m[1][2]];
|
||
let z = [m[2][0], m[2][1], m[2][2]];
|
||
let dot = |a: [f64; 3], b: [f64; 3]| a[0] * b[0] + a[1] * b[1] + a[2] * b[2];
|
||
let cross = [x[1] * y[2] - x[2] * y[1], x[2] * y[0] - x[0] * y[2], x[0] * y[1] - x[1] * y[0]];
|
||
let ok = (dot(x, x) - 1.0).abs() < 1e-6 && (dot(y, y) - 1.0).abs() < 1e-6 && dot(x, y).abs() < 1e-6 && dot(cross, z) > 0.999_999;
|
||
if !ok || m.iter().flatten().any(|v| !v.is_finite()) {
|
||
return Err(KernelError::Invalid("component placements must be rigid (rotation and translation) to export as STEP".into()));
|
||
}
|
||
Ok(([m[3][0], m[3][1], m[3][2]], z, x))
|
||
}
|
||
|
||
/// STEP text (AP242) for products with bodies and assembly placements; `root` is the top product.
|
||
pub fn step_export_products(products: &[ExportProduct], root: usize, header: &StepHeader) -> Result<String> {
|
||
MERGES.with(|m| m.set(0));
|
||
let text = products_text(products, root, header, true)?;
|
||
// Faces merged per surface must read back as cleanly as the pieces they came from (a merge
|
||
// can leave a loop the reader cannot lay out); otherwise the pieces are written. Without a
|
||
// merge there is nothing to check.
|
||
let clean = |t: &str| crate::step_in::step_import(t).is_ok_and(|i| i.warnings.is_empty());
|
||
if MERGES.with(|m| m.get()) > 0 && !clean(&text) {
|
||
let plain = products_text(products, root, header, false)?;
|
||
if clean(&plain) {
|
||
return Ok(plain);
|
||
}
|
||
}
|
||
Ok(text)
|
||
}
|
||
|
||
thread_local! {
|
||
/// Faces merged while writing the current export.
|
||
static MERGES: std::cell::Cell<usize> = const { std::cell::Cell::new(0) };
|
||
}
|
||
|
||
fn products_text(products: &[ExportProduct], root: usize, header: &StepHeader, merge: bool) -> Result<String> {
|
||
if products.is_empty() || root >= products.len() {
|
||
return Err(KernelError::Invalid("nothing to export".into()));
|
||
}
|
||
if products.iter().all(|p| p.bodies.is_empty()) {
|
||
return Err(KernelError::Invalid("nothing to export".into()));
|
||
}
|
||
for p in products {
|
||
for b in &p.bodies {
|
||
b.body.require_brep("STEP export")?;
|
||
}
|
||
if p.children.iter().any(|(c, _, _)| *c >= products.len()) {
|
||
return Err(KernelError::Invalid("bad component reference".into()));
|
||
}
|
||
}
|
||
// No product may contain itself.
|
||
fn cyclic(products: &[ExportProduct], p: usize, stack: &mut Vec<usize>) -> bool {
|
||
if stack.contains(&p) || stack.len() > 64 {
|
||
return true;
|
||
}
|
||
stack.push(p);
|
||
let bad = products.get(p).is_some_and(|x| x.children.iter().any(|(c, _, _)| cyclic(products, *c, stack)));
|
||
stack.pop();
|
||
bad
|
||
}
|
||
if cyclic(products, root, &mut Vec::new()) {
|
||
return Err(KernelError::Invalid("the component tree is recursive".into()));
|
||
}
|
||
|
||
let mut o = Out::default();
|
||
let app = o.add("APPLICATION_CONTEXT('managed model based 3d engineering')");
|
||
o.add(format!("APPLICATION_PROTOCOL_DEFINITION('international standard','ap242_managed_model_based_3d_engineering',2014,#{app})"));
|
||
let pctx = o.add(format!("PRODUCT_CONTEXT('',#{app},'mechanical')"));
|
||
let pdctx = o.add(format!("PRODUCT_DEFINITION_CONTEXT('part definition',#{app},'design')"));
|
||
let mm = o.add("(LENGTH_UNIT()NAMED_UNIT(*)SI_UNIT(.MILLI.,.METRE.))");
|
||
let rad = o.add("(NAMED_UNIT(*)PLANE_ANGLE_UNIT()SI_UNIT($,.RADIAN.))");
|
||
let sr = o.add("(NAMED_UNIT(*)SI_UNIT($,.STERADIAN.)SOLID_ANGLE_UNIT())");
|
||
let unc = o.add(format!("UNCERTAINTY_MEASURE_WITH_UNIT(LENGTH_MEASURE(1.E-06),#{mm},'distance_accuracy_value','confusion accuracy')"));
|
||
let ctx = o.add(format!(
|
||
"(GEOMETRIC_REPRESENTATION_CONTEXT(3)GLOBAL_UNCERTAINTY_ASSIGNED_CONTEXT((#{unc}))GLOBAL_UNIT_ASSIGNED_CONTEXT((#{mm},#{rad},#{sr}))REPRESENTATION_CONTEXT('Context #1','3D Context with UNIT and UNCERTAINTY'))"
|
||
));
|
||
let origin = o.placement([0.0; 3], [0.0, 0.0, 1.0], [1.0, 0.0, 0.0]);
|
||
|
||
// Products (only those reachable from the root).
|
||
let mut reach = vec![false; products.len()];
|
||
let mut todo = vec![root];
|
||
while let Some(p) = todo.pop() {
|
||
if let Some(r) = reach.get_mut(p)
|
||
&& !*r
|
||
{
|
||
*r = true;
|
||
if let Some(x) = products.get(p) {
|
||
todo.extend(x.children.iter().map(|(c, _, _)| *c));
|
||
}
|
||
}
|
||
}
|
||
let mut pd = vec![0u64; products.len()];
|
||
let mut shape_rep = vec![0u64; products.len()];
|
||
let mut product_ids = Vec::new();
|
||
let mut styled = Vec::new();
|
||
let mut child_items: Vec<Vec<u64>> = vec![Vec::new(); products.len()];
|
||
// Placements of children inside each parent, made before the parent's representation.
|
||
let mut placements: Vec<Vec<u64>> = vec![Vec::new(); products.len()];
|
||
for (pi, p) in products.iter().enumerate() {
|
||
if !reach.get(pi).copied().unwrap_or(false) {
|
||
continue;
|
||
}
|
||
for (_, m, _) in &p.children {
|
||
let (t, z, x) = rigid_frame(m)?;
|
||
let (pt, dz, dx) = (o.point(t), o.direction(z), o.direction(x));
|
||
// Its own entity: it is an item of the parent's representation.
|
||
let a = o.add(format!("AXIS2_PLACEMENT_3D('',#{pt},#{dz},#{dx})"));
|
||
if let Some(v) = placements.get_mut(pi) {
|
||
v.push(a);
|
||
}
|
||
if let Some(v) = child_items.get_mut(pi) {
|
||
v.push(a);
|
||
}
|
||
}
|
||
}
|
||
for (pi, p) in products.iter().enumerate() {
|
||
if !reach.get(pi).copied().unwrap_or(false) {
|
||
continue;
|
||
}
|
||
let name = if p.name.trim().is_empty() { "Part".to_string() } else { p.name.clone() };
|
||
let prod = o.add(format!("PRODUCT({},{},'',(#{pctx}))", string(&name), string(&name)));
|
||
product_ids.push(prod);
|
||
let pdf = o.add(format!("PRODUCT_DEFINITION_FORMATION('','',#{prod})"));
|
||
let d = o.add(format!("PRODUCT_DEFINITION('design','',#{pdf},#{pdctx})"));
|
||
let pds = o.add(format!("PRODUCT_DEFINITION_SHAPE('','',#{d})"));
|
||
let mut items = vec![origin];
|
||
items.extend(child_items.get(pi).cloned().unwrap_or_default());
|
||
let item_list = items.iter().map(|i| format!("#{i}")).collect::<Vec<_>>().join(",");
|
||
let srep = o.add(format!("SHAPE_REPRESENTATION({},({item_list}),#{ctx})", string(&name)));
|
||
o.add(format!("SHAPE_DEFINITION_REPRESENTATION(#{pds},#{srep})"));
|
||
if let Some(slot) = pd.get_mut(pi) {
|
||
*slot = d;
|
||
}
|
||
if let Some(slot) = shape_rep.get_mut(pi) {
|
||
*slot = srep;
|
||
}
|
||
if !p.bodies.is_empty() {
|
||
let mut solids = Vec::new();
|
||
for b in &p.bodies {
|
||
for lump in export_lumps(b.body) {
|
||
let (ex, merged, face_paint) = brep_exchange(&lump, merge)?;
|
||
o.merged = merged;
|
||
o.faces_out.clear();
|
||
let mut roots: Vec<u64> =
|
||
ex.entities.iter().filter(|(_, e)| matches!(e.name(), "MANIFOLD_SOLID_BREP" | "BREP_WITH_VOIDS")).map(|(i, _)| *i).collect();
|
||
roots.sort();
|
||
for r in roots {
|
||
let id = o.copy_solid(&ex, r, &b.name).map_err(|e| KernelError::Failed(format!("STEP export: {e}")))?;
|
||
solids.push(id);
|
||
let opacity = lump.paint().map(|p| p.opacity).unwrap_or(1.0);
|
||
if let Some(c) = b.color {
|
||
styled.push(style(&mut o, id, c, opacity));
|
||
}
|
||
}
|
||
// Faces with colours of their own.
|
||
let mut painted: Vec<(u64, ([f32; 3], f32))> =
|
||
face_paint.into_iter().filter_map(|(f, look)| Some((*o.faces_out.get(&f)?, look))).collect();
|
||
painted.sort_by_key(|(f, _)| *f);
|
||
for (f, (c, op)) in painted {
|
||
styled.push(style(&mut o, f, c, op));
|
||
}
|
||
}
|
||
}
|
||
let list = solids.iter().chain(std::iter::once(&origin)).map(|i| format!("#{i}")).collect::<Vec<_>>().join(",");
|
||
let absr = o.add(format!("ADVANCED_BREP_SHAPE_REPRESENTATION({},({list}),#{ctx})", string(&name)));
|
||
o.add(format!("SHAPE_REPRESENTATION_RELATIONSHIP('','',#{srep},#{absr})"));
|
||
}
|
||
}
|
||
if !product_ids.is_empty() {
|
||
let list = product_ids.iter().map(|i| format!("#{i}")).collect::<Vec<_>>().join(",");
|
||
o.add(format!("PRODUCT_RELATED_PRODUCT_CATEGORY('part','',({list}))"));
|
||
}
|
||
// Assembly occurrences.
|
||
for (pi, p) in products.iter().enumerate() {
|
||
if !reach.get(pi).copied().unwrap_or(false) {
|
||
continue;
|
||
}
|
||
for (k, (ci, _, oname)) in p.children.iter().enumerate() {
|
||
let (Some(&parent_pd), Some(&child_pd), Some(&parent_sr), Some(&child_sr), Some(&target)) =
|
||
(pd.get(pi), pd.get(*ci), shape_rep.get(pi), shape_rep.get(*ci), placements.get(pi).and_then(|v| v.get(k)))
|
||
else {
|
||
continue;
|
||
};
|
||
let nm = if oname.trim().is_empty() {
|
||
format!("{}:{}", products.get(*ci).map(|c| c.name.as_str()).unwrap_or(""), k + 1)
|
||
} else {
|
||
oname.clone()
|
||
};
|
||
let nauo = o.add(format!("NEXT_ASSEMBLY_USAGE_OCCURRENCE({},{},'',#{parent_pd},#{child_pd},$)", string(&nm), string(&nm)));
|
||
let pds = o.add(format!("PRODUCT_DEFINITION_SHAPE('','',#{nauo})"));
|
||
let idt = o.add(format!("ITEM_DEFINED_TRANSFORMATION('','',#{origin},#{target})"));
|
||
let rr = o.add(format!(
|
||
"(REPRESENTATION_RELATIONSHIP('','',#{child_sr},#{parent_sr})REPRESENTATION_RELATIONSHIP_WITH_TRANSFORMATION(#{idt})SHAPE_REPRESENTATION_RELATIONSHIP())"
|
||
));
|
||
o.add(format!("CONTEXT_DEPENDENT_SHAPE_REPRESENTATION(#{rr},#{pds})"));
|
||
}
|
||
}
|
||
if !styled.is_empty() {
|
||
let list = styled.iter().map(|i| format!("#{i}")).collect::<Vec<_>>().join(",");
|
||
o.add(format!("MECHANICAL_DESIGN_GEOMETRIC_PRESENTATION_REPRESENTATION('',({list}),#{ctx})"));
|
||
}
|
||
|
||
let mut s = String::new();
|
||
s.push_str("ISO-10303-21;\nHEADER;\n");
|
||
s.push_str("FILE_DESCRIPTION(('SolidCraft model'),'2;1');\n");
|
||
let _ = writeln!(
|
||
s,
|
||
"FILE_NAME({},{},({}),({}),'SolidCraft','SolidCraft','');",
|
||
string(&header.file_name),
|
||
string(&header.time_stamp),
|
||
string(&header.author),
|
||
string(&header.organization)
|
||
);
|
||
s.push_str("FILE_SCHEMA(('AP242_MANAGED_MODEL_BASED_3D_ENGINEERING_MIM_LF { 1 0 10303 442 1 1 4 }'));\nENDSEC;\nDATA;\n");
|
||
for (i, l) in o.lines.iter().enumerate() {
|
||
let _ = writeln!(s, "#{}={l};", i + 1);
|
||
}
|
||
s.push_str("ENDSEC;\nEND-ISO-10303-21;\n");
|
||
Ok(s)
|
||
}
|
||
|
||
/// A surface colour for a solid (STYLED_ITEM chain).
|
||
fn style(o: &mut Out, item: u64, c: [f32; 3], opacity: f32) -> u64 {
|
||
let rgb = o.add_shared(format!("COLOUR_RGB('',{},{},{})", real(c[0] as f64), real(c[1] as f64), real(c[2] as f64)));
|
||
let fasc = o.add_shared(format!("FILL_AREA_STYLE_COLOUR('',#{rgb})"));
|
||
let fas = o.add_shared(format!("FILL_AREA_STYLE('',(#{fasc}))"));
|
||
let ssfa = o.add_shared(format!("SURFACE_STYLE_FILL_AREA(#{fas})"));
|
||
// See-through looks add a transparency (1 = invisible) to the side style.
|
||
let sides = if opacity < 1.0 {
|
||
let tr = o.add_shared(format!("SURFACE_STYLE_TRANSPARENT({})", real((1.0 - opacity as f64).clamp(0.0, 1.0))));
|
||
format!("#{ssfa},#{tr}")
|
||
} else {
|
||
format!("#{ssfa}")
|
||
};
|
||
let sss = o.add_shared(format!("SURFACE_SIDE_STYLE('',({sides}))"));
|
||
let ssu = o.add_shared(format!("SURFACE_STYLE_USAGE(.BOTH.,#{sss})"));
|
||
let psa = o.add_shared(format!("PRESENTATION_STYLE_ASSIGNMENT((#{ssu}))"));
|
||
o.add(format!("STYLED_ITEM('color',(#{psa}),#{item})"))
|
||
}
|
||
|
||
/// STEP text for bodies of one part (names `Body1`…).
|
||
pub fn step_export_bodies(bodies: &[ExportBody], header: &StepHeader) -> Result<String> {
|
||
let name = if header.file_name.is_empty() {
|
||
"Part".to_string()
|
||
} else {
|
||
header.file_name.trim_end_matches(".step").trim_end_matches(".stp").to_string()
|
||
};
|
||
let p = ExportProduct {
|
||
name,
|
||
bodies: bodies.iter().map(|b| ExportBody { name: b.name.clone(), body: b.body, color: b.color }).collect(),
|
||
children: Vec::new(),
|
||
};
|
||
step_export_products(&[p], 0, header)
|
||
}
|
||
|
||
#[cfg(test)]
|
||
mod tests {
|
||
use super::*;
|
||
|
||
#[test]
|
||
fn islands_are_solids_of_their_own_not_voids() {
|
||
use solidcraft_geom::{Loop2, Plane, Region2, Vec2};
|
||
let square = |a: f64, b: f64| Loop2::polygon(&[Vec2::new(a, a), Vec2::new(b, a), Vec2::new(b, b), Vec2::new(a, b)]);
|
||
// A plate with a square hole, and an island inside the hole (a letter's counter).
|
||
let plate = Region2 { outer: square(0.0, 30.0), holes: vec![square(10.0, 20.0).reversed()] };
|
||
let island = Region2 { outer: square(12.0, 18.0), holes: vec![] };
|
||
let body = crate::extrude_planar_regions(&Plane::XY, &[plate, island], 0.0, 2.0).unwrap();
|
||
assert_eq!(body.shell_count(), 2);
|
||
let text = crate::step_export(&[&body], "test").unwrap();
|
||
assert_eq!(text.matches("MANIFOLD_SOLID_BREP(").count(), 2, "{text}");
|
||
assert_eq!(text.matches("BREP_WITH_VOIDS").count(), 0);
|
||
let imp = crate::step_import(&text).unwrap();
|
||
let v: f64 = imp.bodies.iter().map(|b| crate::measure(&b.body).unwrap().volume).sum();
|
||
assert!((v - (800.0 + 36.0) * 2.0).abs() < 1e-6, "{v}");
|
||
// A real void stays a void.
|
||
let hollow = crate::boolean(
|
||
&crate::box_solid(Vec3::ZERO, Vec3::new(10.0, 10.0, 10.0)).unwrap(),
|
||
&crate::box_solid(Vec3::new(3.0, 3.0, 3.0), Vec3::new(7.0, 7.0, 7.0)).unwrap(),
|
||
crate::BoolOp::Cut,
|
||
)
|
||
.unwrap()
|
||
.unwrap();
|
||
assert_eq!(hollow.shell_count(), 2);
|
||
let text = crate::step_export(&[&hollow], "test").unwrap();
|
||
assert_eq!(text.matches("BREP_WITH_VOIDS").count(), 1, "{text}");
|
||
}
|
||
|
||
#[test]
|
||
fn numbers_and_strings() {
|
||
assert_eq!(real(1.0), "1.0");
|
||
assert_eq!(real(1e-6), "1.E-6");
|
||
assert_eq!(real(-2.5e20), "-2.5E20");
|
||
assert_eq!(real(3.0e100), "3.E100");
|
||
assert_eq!(string("it's"), "'it''s'");
|
||
assert_eq!(string("é"), "'\\X2\\00E9\\X0\\'");
|
||
let ex = p21::parse(&format!("ISO-10303-21;DATA;#1=A({},{});ENDSEC;END-ISO-10303-21;", string("a'b\\é"), real(1e-6))).unwrap();
|
||
let p = ex.get(1).unwrap().params();
|
||
assert_eq!(p[0].as_str(), Some("a'b\\é"));
|
||
assert_eq!(p[1].as_f64(), Some(1e-6));
|
||
}
|
||
|
||
#[test]
|
||
fn assembly_names_colours_round_trip() {
|
||
use crate::{box_solid, cylinder, measure, step_import, step_validate};
|
||
let bx = box_solid(solidcraft_geom::Vec3::ZERO, solidcraft_geom::Vec3::new(10.0, 20.0, 5.0)).unwrap();
|
||
let pin = cylinder(solidcraft_geom::Vec3::ZERO, solidcraft_geom::Vec3::Z, 2.0, 8.0).unwrap();
|
||
let rot90 = [[0.0, 1.0, 0.0, 0.0], [-1.0, 0.0, 0.0, 0.0], [0.0, 0.0, 1.0, 0.0], [50.0, 0.0, 0.0, 1.0]];
|
||
let shift = [[1.0, 0.0, 0.0, 0.0], [0.0, 1.0, 0.0, 0.0], [0.0, 0.0, 1.0, 0.0], [0.0, 0.0, 5.0, 1.0]];
|
||
let products = vec![
|
||
ExportProduct {
|
||
name: "Root Ä".into(),
|
||
bodies: vec![ExportBody { name: "Base".into(), body: &bx, color: Some([1.0, 0.0, 0.0]) }],
|
||
children: vec![(1, shift, "Pin:1".into()), (1, rot90, "Pin:2".into())],
|
||
},
|
||
ExportProduct { name: "Pin".into(), bodies: vec![ExportBody { name: "Shaft".into(), body: &pin, color: None }], children: vec![] },
|
||
];
|
||
let text = step_export_products(&products, 0, &StepHeader { file_name: "a.step".into(), ..Default::default() }).unwrap();
|
||
step_validate(&text).unwrap();
|
||
assert!(text.contains("AP242_MANAGED_MODEL_BASED_3D_ENGINEERING_MIM_LF"));
|
||
assert_eq!(text.matches("NEXT_ASSEMBLY_USAGE_OCCURRENCE").count(), 2);
|
||
// Shared geometry: the unit Z direction is written once.
|
||
assert_eq!(text.matches("DIRECTION('',(0.0,0.0,1.0))").count(), 1);
|
||
let imp = step_import(&text).unwrap();
|
||
assert!(imp.warnings.is_empty(), "{:?}", imp.warnings);
|
||
assert_eq!(imp.bodies.len(), 3);
|
||
let names: Vec<&str> = imp.bodies.iter().map(|b| b.name.as_str()).collect();
|
||
assert_eq!(names, ["Base", "Shaft", "Shaft"]);
|
||
assert_eq!(imp.bodies[0].color, Some([1.0, 0.0, 0.0]));
|
||
assert_eq!(imp.tree[0].name, "Root Ä");
|
||
assert_eq!(imp.tree[0].children.len(), 2);
|
||
let m: Vec<_> = imp.bodies.iter().map(|b| measure(&b.body).unwrap()).collect();
|
||
assert!((m[1].bbox.min.z - 5.0).abs() < 1e-6 && (m[1].bbox.max.z - 13.0).abs() < 1e-6);
|
||
// Rotated 90° about Z and moved 50 along X: centre at (50, 0).
|
||
assert!(m[2].centroid.dist(solidcraft_geom::Vec3::new(50.0, 0.0, 4.0)) < 1e-3, "{:?}", m[2].centroid);
|
||
// Recursion and bad placements are errors.
|
||
let cyc = vec![ExportProduct {
|
||
name: "A".into(),
|
||
bodies: vec![ExportBody { name: "B".into(), body: &bx, color: None }],
|
||
children: vec![(0, shift, String::new())],
|
||
}];
|
||
assert!(step_export_products(&cyc, 0, &StepHeader::default()).is_err());
|
||
let scaled = [[2.0, 0.0, 0.0, 0.0], [0.0, 1.0, 0.0, 0.0], [0.0, 0.0, 1.0, 0.0], [0.0; 4]];
|
||
let bad = vec![
|
||
ExportProduct { name: "A".into(), bodies: vec![], children: vec![(1, scaled, String::new())] },
|
||
ExportProduct { name: "B".into(), bodies: vec![ExportBody { name: "B".into(), body: &bx, color: None }], children: vec![] },
|
||
];
|
||
assert!(step_export_products(&bad, 0, &StepHeader::default()).is_err());
|
||
}
|
||
}
|