Giovanni
57d738eac4
Walls swept along a spline have flat B-spline tops and bottoms, so booleans between them went to the general intersection, which fails on coincident spline faces. Such faces are now put on true planes, and two prisms of the same height and direction are decided in 2D with their spline outlines fitted by arcs within a micron. The result is kept only when its volume is plausible; otherwise the general boolean takes over. The free-form flag is cleared by a drop guard so an unwinding boolean can't leave it set. Fixes #844.
45 lines
2.1 KiB
Rust
45 lines
2.1 KiB
Rust
//! Two interleaved spiral walls, joined (the case a of #844: 22 mm pitch, 0.75 turn).
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use std::f64::consts::TAU;
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use super::*;
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/// The join used to be an error: the walls' flat tops and bottoms are B-spline faces, so nothing
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/// saw that they coincide. Now they are prisms, and the join is decided in 2D.
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#[test]
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fn two_interleaved_spiral_walls_join_into_one_body() {
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let (pitch, turns, points) = (22.0, 0.75, 19usize);
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let (thickness, height, start) = (12.0, 60.0, 60.0);
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let (k, end) = (pitch / TAU, turns * TAU);
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let arm = |sign: f64| -> Vec<[f64; 2]> {
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(0..points)
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.map(|i| {
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let a = end * i as f64 / (points - 1) as f64;
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let r = start + k * a;
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[sign * r * a.cos(), sign * r * a.sin()]
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})
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.collect()
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};
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let mut s = Session::default();
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for (tag, sign) in [("A", 1.0), ("B", -1.0)] {
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let x0 = sign * start;
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run(&mut s, "sketch.create", json!({"plane": "XY", "name": format!("Path{tag}")}));
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run(&mut s, "sketch.spline.fit_point", json!({"points": arm(sign)}));
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run(&mut s, "sketch.finish", json!({}));
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run(&mut s, "sketch.create", json!({"plane": "XZ", "name": format!("Prof{tag}")}));
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run(&mut s, "sketch.rectangle.two_point", json!({"p0": [x0 - thickness / 2.0, -height], "p1": [x0 + thickness / 2.0, 0]}));
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run(&mut s, "sketch.finish", json!({}));
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let sweep = json!({
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"sketch": format!("Prof{tag}"), "path_sketch": format!("Path{tag}"), "path": ["s1"],
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"operation": "new", "name": format!("Sweep{tag}"), "body_name": format!("Band{tag}"),
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});
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run(&mut s, "solid.sweep", sweep);
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}
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run(&mut s, "solid.combine", json!({"target": "BandA", "tools": ["BandB"], "operation": "join", "name": "Joined"}));
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assert_eq!(s.model.state().bodies.len(), 1);
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// The two walls' plan areas united, by a plan-view raster (0.6 mm cells, flat ends), times the height.
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let want = 450_878.0;
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let got = volume(&mut s);
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assert!(rel(got, want) < 5e-3, "{got} vs {want}");
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}
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