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Hakan SevenandClaude Opus 4.7 172c538159 fix(scene): hatch boundary + pattern precision for large-WCS drawings

Two precision problems were producing visibly wrong hatches on UTM-scale
(and similarly-offset) drawings even after world_offset was correct:

1. **Boundary tessellation** — `hatch_model_from_dxf`'s polyline-bulge
   arc tessellation ran the whole arc-center computation in f32. With
   vertices at WCS magnitude ~1e5 the f32 ULP is ~1 cm, which propagated
   into the sampled arc points and showed up as visibly wavy / jagged
   hatch boundaries on edges that crossed the long axis of the drawing.
   Re-run the full bulge → arc math in f64; only cast at the to_xy
   call that feeds the (also f64) boundary buffer.

2. **Pattern phase** — the per-fragment `perp / perp_step` modulo blew
   precision when `xz` was at offset-rel WCS magnitude and perp_step
   was sub-cm. Move the precision-critical bits out of f32 by keeping
   each hatch's anchor in f64 on the model side: `HatchModel` now
   carries a `world_origin: [f64; 2]` and the `boundary: [f32; 2]`
   vertices are stored as small offsets from it. The GPU vertex shader
   adds `origin` back inside the view_proj multiply for clip position
   (sub-pixel-lossy at large hatches but invisible); the `xz` varying
   that the fragment shader uses for in_polygon + pattern math stays
   in hatch-local space at full f32 precision.

   For pattern alignment across adjacent hatches with the same family,
   the GPU pipeline snaps the anchor to the family's perp/along grid
   in f64 before sending it down. Snap uses the same QCAD-PAT
   convention (`fam.dy = perp_step`, `fam.dx = along_step`) the
   shader's check_family uses — an earlier attempt used the world-frame
   `(-dx*sin + dy*cos)` formula, which produced a meaningless grid and
   no alignment.

   Trade-off: pattern phase is "global modulo per-family-grid" rather
   than tied to WCS (0,0). Same hatches still align with each other;
   the absolute phase relative to the WCS origin may differ from the
   pre-fix behaviour on small drawings.

Consumers that read `model.boundary` directly (hit_test, paper_canvas,
add_hatch round-trip) reconstruct WCS via `boundary[i] + world_origin`.
The hatch wgsl bind-group entry for binding 0 was bumped to
`VERTEX | FRAGMENT` because the vertex shader now reads `h.origin`.

The fragment-shader hatch LOD substitute + sub-pixel skip from e7675be
and the scissor plumbing from fbbac42 still work — those touched
different fields of the same struct.

Co-Authored-By: Claude Opus 4.7 <[email protected]>

2026-05-16 08:41:23 +03:00

.claude

feat: add local settings for Bash permissions

2026-04-30 10:01:17 +03:00

.github

ci: include version, OS and arch in release asset filenames

2026-04-24 10:13:11 +03:00

assets

feat: view tab widget toggle commands and unified SVG icon color scheme

2026-04-24 01:23:06 +03:00

examples

perf(scene): frustum-cull wires using camera view AABB

2026-05-14 13:52:04 +03:00

flatpak

chore: release v0.2.8

2026-05-15 23:39:19 +03:00

src

fix(scene): hatch boundary + pattern precision for large-WCS drawings

2026-05-16 08:41:23 +03:00

.gitignore

chore: exclude ROADMAP.md from version control

2026-04-06 23:28:04 +03:00

build.rs

feat: redesign View tab and fix Annotate/tab order

2026-04-09 12:25:15 +03:00

Cargo.lock

chore: release v0.2.8

2026-05-15 23:39:19 +03:00

Cargo.toml

chore: release v0.2.8

2026-05-15 23:39:19 +03:00

COMMANDS.md

docs: add COMMANDS.md and update ROADMAP.md in English

2026-04-09 20:06:35 +03:00

LICENSE

Initial commit

2026-03-22 14:53:51 +03:00

README.md

Update image in README.md

2026-05-12 22:26:34 +03:00

RENDERING_OPTIMIZATION.md

chore(scene): drop INSERT_SUB_LIMIT guard from fallback explode path

2026-05-15 23:53:26 +03:00

README.md

H7CAD

A CAD application for 2D drafting and 3D modeling, built with Rust. Reads and writes DWG and DXF files natively.

Features

File Formats

DWG read/write (R13 through R2018)
DXF read/write (R13 through R2018)
STL export (STLOUT / EXPORTSTL)
STEP AP203 export (STEPOUT)
OBJ import (IMPORTOBJ)
PDF export (plot layouts to PDF)
WBLOCK — write selected entities or a block to an external file
XREF — attach, reload, and auto-resolve external references

2D Drafting

Command	Description
`LINE`, `PLINE`, `RECTANG`, `POLYGON`	Basic geometry
`CIRCLE`, `ARC`, `ELLIPSE`, `SPLINE`	Curves
`HATCH`, `HATCHEDIT`	Hatch fills with pattern, scale, angle editing
`OFFSET`, `TRIM`, `EXTEND`, `FILLET`	Modify geometry (supports lines, arcs, ellipses, polylines, splines)
`BREAK`, `STRETCH`, `LENGTHEN`	Shape editing
`ARRAY`, `MIRROR`, `MOVE`, `COPY`, `ROTATE`, `SCALE`	Transformations
`EXPLODE`	Explode blocks, dimensions, polylines, mlines
`DDEDIT`	Double-click text editing
`MASSPROP`	Area, perimeter, centroid of selected entities

3D Modeling

Command	Description
`BOX`, `SPHERE`, `CYLINDER`	Solid primitives
`EXTRUDE`, `REVOLVE`	Profile-based solids
`LOFT`	Ruled-surface loft through cross-sections
`SWEEP`	Sweep a profile along a path
`ARRAY3D`	3D array
ACIS tessellation	Renders `3DSOLID`, `REGION`, and `BODY` entities

Annotations & Dimensions

Dimensions: Linear, Aligned, Angular, Radial, Diameter, Ordinate — with full DIMSTYLE support (DIMASZ, DIMSCALE, DIMEXO, DIMEXE, and more)
Text: MTEXT, TEXT, DTEXT with font browser (STYLE DIALOG)
Leaders: MLEADER with straight and spline path types; MLEADERSTYLE manager
Tolerances: GD&T feature control frames
Tables: TABLE entity render; TABLESTYLE manager
MLine: MLINE entity with MLSTYLE manager and EXPLODE support

Paper Space & Layouts

Multi-tab layout system with model space and unlimited paper space tabs
Viewport projection: Model content correctly projected into paper-space viewport rectangles
Camera persistence: View position and zoom saved per layout; restored on file open and tab switch
Correct paper size: Physical paper dimensions read from embedded PlotSettings (not drawing limits)
Inline MSPACE overlay — enter a viewport with double-click; edit model entities in place
VPORTS — preset viewport configurations (single, 2H, 2V, 4-way)
LAYOUTMANAGER / LAYOUTPANEL — GUI layout manager
PLOTSTYLEPANEL / STYLESMANAGER — plot style table editor (CTB/STB)
PRINT — send layout to system printer

Blocks & References

INSERT with attribute prompting (ATTREQ)
ATTEDIT — edit block attribute values interactively
REFEDIT / REFCLOSE — in-place block reference editing
XREF — attach, reload, and resolve external DWG/DXF references
DATAEXTRACTION — export entity property data to CSV

Snapping & Precision

Object snaps: Endpoint, Midpoint, Center, Node, Quadrant, Intersection, Perpendicular, Tangent, Nearest, Insertion, and more
Ellipse arc endpoints, LWPolyline arc midpoints, Hatch boundary points
Object Snap Tracking (OTRACK / F11)
Polar Tracking with configurable angle increment
Dynamic Input overlay (DYNMODE / F12)
Grid snap with adaptive spacing
Command history navigation (↑ / ↓)

Rendering

GPU-accelerated via WebGPU (wgpu)
4× MSAA anti-aliasing
Orthographic and perspective camera
ViewCube with face/edge/corner snapping
Wide polylines: LWPolyline and Polyline2D filled strokes
Raster images: GPU-textured quad pipeline (IMAGE command)
Wipeout: Solid fill masking
Complex linetypes: Text and shape elements rendered in linetype patterns
White/black entity colors adapt to background luminance
Per-viewport background color (BACKGROUND)
Visual style selector (Wireframe, Shaded, etc.)
X-ray ghost pass for selected wires occluded by geometry

UI

Modular ribbon interface — Home, Insert, Annotate, View, Manage, Layout
Command line with autocomplete and history
Layer Manager with per-viewport freeze columns
Properties panel
COLORSCHEME — runtime theme switching
SHORTCUTS — keyboard shortcuts panel
SPLINEDIT — close, open, reverse spline control points
UCS icon with 3D foreshortening and axis labels

Installation

Linux (AppImage)

Download H7CAD-*-linux-x86_64.AppImage from the latest release, then:

chmod +x H7CAD-*-linux-x86_64.AppImage
./H7CAD-*-linux-x86_64.AppImage

No installation required — runs directly on any modern Linux distribution.

Windows

Download H7CAD.exe from the latest release and run it directly.

Build from Source

Requirements: Rust 1.75+

git clone https://github.com/HakanSeven12/H7CAD.git
cd H7CAD
cargo build --release --bin H7CAD
./target/release/H7CAD

License

GPL-3.0-only — see LICENSE

README.md Unescape Escape

H7CAD

Features

File Formats

2D Drafting

3D Modeling

Annotations & Dimensions

Paper Space & Layouts

Blocks & References

Snapping & Precision

Rendering

UI

Installation

Linux (AppImage)

Windows

Build from Source

License

README.md