AI_Assistant/cad-editor
Watch
1
0
Fork
You've already forked cad-editor
 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

feat(render): double-single anchors for both hatch pipelines

Browse source 
The hatch anchor (world_origin / pattern origin) was cast to a single
f32, quantizing UTM-scale fills to ~0.5 m and reintroducing jitter the
wire path no longer had. Both the batched and per-hatch pipelines now
carry the anchor as a high/low f32 pair (HatchInstance.world_origin_low,
HatchUniformData.origin_low) and reconstruct the eye-relative position in
the shader as (origin_high - eye_high) + (local + origin_low - eye_low).

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
This commit is contained in:
Hakan Seven 2026-06-23 17:52:28 +03:00
commit 0f7920dc2c
4 changed files with 71 additions and 29 deletions
Download patch file Download diff file Expand all files Collapse all files

11
src/scene/pipeline/hatch_gpu.rs
View file

@ -58,13 +58,15 @@ pub struct HatchUniformData {
pub grad_sin: f32, // 52: gradient direction sin
pub grad_min: f32, // 56: gradient proj_min
pub grad_range: f32, // 60: gradient proj_range
pub origin: [f32; 2], // 64: hatch-local origin (boundary AABB centre).
pub origin: [f32; 2], // 64: hatch-local origin (boundary AABB centre),
// // high half of the double-single anchor.
// // The pattern fragment shader subtracts this
// // from xz before the perp/perp_step quotient
// // so f32 doesn't catastrophically cancel when
// // world coords are large and pattern spacing
// // is small (e.g. UTM drawing + sub-mm hatch).
pub _pad: [f32; 2], // 72: 16-byte alignment
pub origin_low: [f32; 2], // 72: anchor low residual (double-single) so the
// // vertex clip position stays precise at UTM scale.
} // total 80 bytes
/// Boundary polygon (binding 1). Matches WGSL `Boundary`.
@ -288,7 +290,10 @@ impl HatchGpu {
grad_min,
grad_range,
origin: [origin[0] as f32, origin[1] as f32],
_pad: [0.0; 2],
origin_low: [
(origin[0] - origin[0] as f32 as f64) as f32,
(origin[1] - origin[1] as f32 as f64) as f32,
],
};
// ── BoundaryData (in snapped-local space) ────────────────────────