40c4184d41
Regression test for the procedural BLAS path: the same 3x3x3 grid of unit-box AABBs runs through a PROCEDURAL_HIT_GROUP_KHR group whose GLSL intersection shader (reportIntersectionEXT) turns each box into a radius-1 sphere, the any-hit shader punches the spherical-checkerboard cut-out (visible proof non-opaque geometry runs any-hit), and the closest-hit shades per-instance tints — the WebGPU example behavior reproduced natively. Fixed camera in raygen.glsl; the WebGPU/DOM path is unchanged. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
1.4 KiB
RTVolume
Ray tracing of procedural (AABB) geometry with an any-hit cut-out on both backends — software WebGPU (issue #13) and native Vulkan hardware RT (issue #33).
A 3×3×3 grid of unit boxes is registered as an AABB BLAS
(Mesh::BuildProcedural — VK_GEOMETRY_TYPE_AABBS_KHR on Vulkan, the
software AABB-leaf path on WebGPU). The hit group is procedural
(RTShaderGroupType::ProceduralHitGroup /
VK_RAY_TRACING_SHADER_GROUP_TYPE_PROCEDURAL_HIT_GROUP_KHR) carrying:
intersection.wgsl/intersection.glsl— analytic ray–sphere test that turns each box into a radius-1 sphere (runs once per box the ray enters);anyhit.wgsl/anyhit.glsl— ignores the intersection for half the cells of a spherical checkerboard, so the ray passes through and the background / spheres behind show through (the visible proof any-hit runs);closesthit.wgsl/closesthit.glsl— normal-based Lambert shading, tinted per instance.
The geometry is registered non-opaque and the instances clear their
force-opaque flag, which is what lets the any-hit shader run. Flip the
instance flag to kRTGeometryInstanceForceOpaque (or build the mesh with
opaque = true) to skip any-hit and see solid spheres.
WebGPU/DOM (free camera, WASD + mouse):
crafter-build --target=wasm32-wasip1 -r
Native Vulkan (fixed camera in raygen.glsl):
crafter-build -r