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feat(solid3d): draw ISOLINES on curved faces in wireframe

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A cylinder's wireframe showed only its two rim circles, so from the side it
read as two disconnected ellipses rather than a cylinder. AutoCAD draws
ISOLINES — a fixed set of longitudinal lines on each curved face — so the
surface reads from any angle.

`collect_isolines` walks the cone-surface faces (cylinder and cone), recovers
each face's height and angular extent with the same logic `tess_cone_face`
uses, and emits `header.isolines` (default 4) longitudinal segments from the
bottom rim to the top rim. They are appended to the feature-edge line list, so
they ride the existing body transform, double-single split, and top-level /
per-INSTANCE re-split for free.

Being part of `edge_verts`, they inherit the edge pass's gating: drawn in the
wireframe modes and in shaded-with-edges, hidden in plain shaded — matching
where AutoCAD shows isolines. `isolines` is threaded from the header through
the tessellation entry points alongside `facet_res`.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
This commit is contained in:
Hakan Seven 2026-07-17 19:45:42 +03:00
commit 0ce150411a
4 changed files with 115 additions and 22 deletions
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15
src/entities/solid3d.rs
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@ -265,12 +265,17 @@ pub fn fallback_wires(e: &EntityType) -> Option<&[acadrust::entities::Wire]> {
/// Run the appropriate `solid3d_tess::tessellate_*` for the entity,
/// returning `None` for non-volume entities or when the kernel fails.
pub fn tessellate_volume(e: &EntityType, color: [f32; 4], facet_res: f64) -> Option<MeshLodSet> {
pub fn tessellate_volume(
e: &EntityType,
color: [f32; 4],
facet_res: f64,
isolines: usize,
) -> Option<MeshLodSet> {
match e {
EntityType::Solid3D(s) => solid3d_tess::tessellate_solid3d(s, color, facet_res),
EntityType::Region(r) => solid3d_tess::tessellate_region(r, color, facet_res),
EntityType::Body(b) => solid3d_tess::tessellate_body(b, color, facet_res),
EntityType::Surface(s) => solid3d_tess::tessellate_surface(s, color, facet_res),
EntityType::Solid3D(s) => solid3d_tess::tessellate_solid3d(s, color, facet_res, isolines),
EntityType::Region(r) => solid3d_tess::tessellate_region(r, color, facet_res, isolines),
EntityType::Body(b) => solid3d_tess::tessellate_body(b, color, facet_res, isolines),
EntityType::Surface(s) => solid3d_tess::tessellate_surface(s, color, facet_res, isolines),
_ => None,
}
}