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* Polyface meshes stay one object through DXF and DWG A polyface mesh (POLYLINE flag 64) was read as loose 3D faces. It is now read, drawn, exploded into its 3D faces and written back as a POLYLINE. Hidden edges aren't drawn. A mesh too large for the 16-bit groups 71-74 is saved as 3D faces. Split from #1005. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> * A polyface face ends at its first zero index A face record with a gap ([1, 2, 0, 3]) has two corners and is dropped, not read as a triangle. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> * Polyface meshes: write only faces that name their vertices; ID gives their Z The writer drops the faces the reader would drop, so no record names a missing vertex, and the 16-bit check only needs the counts. ID and DIST give a mesh the Z of its nearest visible edge, as they do for 3D faces. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> --------- Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com> Co-authored-by: Brandon Thomas <echelon@gmail.com>
33 lines
1.3 KiB
Rust
33 lines
1.3 KiB
Rust
//! EXPLODE turns a polyface mesh into its 3D faces, as AutoCAD does; hidden edges stay hidden.
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use cadcraft_engine::Session;
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use cadcraft_engine::doc::{Common, EntityKind, PolyfaceMesh, Space};
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use cadcraft_geom::Vec3;
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use serde_json::json;
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#[test]
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fn exploding_a_polyface_mesh_gives_its_3d_faces() {
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let mut s = Session::new();
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let mesh = PolyfaceMesh {
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vertices: vec![Vec3::new(0.0, 0.0, 0.0), Vec3::new(10.0, 0.0, 0.0), Vec3::new(10.0, 10.0, 2.0), Vec3::new(0.0, 10.0, 2.0)],
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faces: vec![[1, 2, -3, 0], [3, 4, -1, 0]],
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};
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let h = s.doc_mut().unwrap().add(&Space::Model, Common::default(), EntityKind::PolyfaceMesh(mesh)).unwrap();
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s.execute("explode", &json!({"handles": [h.hex()]})).unwrap();
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let faces: Vec<_> = s
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.doc()
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.unwrap()
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.model
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.iter()
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.filter_map(|e| match &e.kind {
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EntityKind::Face3d(f) => Some(f.clone()),
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_ => None,
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})
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.collect();
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assert_eq!(faces.len(), 2);
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assert!(s.doc().unwrap().model.iter().all(|e| !matches!(e.kind, EntityKind::PolyfaceMesh(_))));
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// The diagonal starts at the third corner of the first triangle: edge 3 (and the closing 4th) hidden.
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assert_eq!(faces[0].corners[2], Vec3::new(10.0, 10.0, 2.0));
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assert_eq!(faces[0].hidden_edges, 4 | 8);
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}
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