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feat: plinegen + SAB parsing for Solid3D/Region/Body

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LwPolyline PLINEGEN=0 (DXF default): emit SegmentedLines with NaN
separators between vertex-to-vertex segments; wire_gpu resets
arc-length to 0 after each NaN so linetype pattern restarts per vertex.
PLINEGEN=1: existing Contour path unchanged (continuous pattern).
WireModel gains plinegen field propagated through tessellate pipeline.

Solid3D/Region/Body: call SabReader::read() when parse_sat() returns
None due to binary SAB format (DWG files / newer AutoCAD exports).

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
This commit is contained in:
Hakan Seven 2026-05-06 06:55:28 +03:00
commit 27aca41dd1
39 changed files with 168 additions and 15 deletions
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16
src/scene/pipeline/wire_gpu.rs
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@ -148,7 +148,12 @@ impl WireGpu {
let p = wire.points[i - 1];
let q = wire.points[i];
if !p[0].is_finite() || !q[0].is_finite() {
dists[i] = dists[i - 1];
// plinegen=false: reset to 0 at the first real point after a NaN separator.
dists[i] = if !wire.plinegen && !p[0].is_finite() && q[0].is_finite() {
0.0
} else {
dists[i - 1]
};
} else {
let dx = q[0] - p[0];
let dy = q[1] - p[1];
@ -234,10 +239,13 @@ impl WireGpu {
for i in 1..n {
let p = wire.points[i - 1];
let q = wire.points[i];
// If either point is non-finite (NaN sentinel or ±inf from overflow),
// keep the same distance — the segment will be skipped anyway.
if !p[0].is_finite() || !q[0].is_finite() {
dists[i] = dists[i - 1];
// plinegen=false: reset to 0 at the first real point after a NaN separator.
dists[i] = if !wire.plinegen && !p[0].is_finite() && q[0].is_finite() {
0.0
} else {
dists[i - 1]
};
} else {
let dx = q[0] - p[0];
let dy = q[1] - p[1];