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docs(webgpu-rt): add RTVolume example (procedural spheres + any-hit cut-out)

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A 3x3x3 grid of AABB-geometry spheres rendered through an analytic
ray-sphere intersection shader, with an any-hit spherical-checkerboard
cut-out so the background shows through. Exercises both features end to
end on the WebGPU wavefront tracer.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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catbot 2026-06-02 22:09:30 +00:00
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README.md
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@ -22,7 +22,11 @@ The two backends share the same C++ surface for the high-level pieces
(`*Vulkan` vs `*WebGPU`) live behind `#ifdef CRAFTER_GRAPHICS_WINDOW_DOM`.
Vulkan ray tracing is hardware (`VK_KHR_ray_tracing_pipeline`); WebGPU
ray tracing is a library-built software path (BVH + traceRay in a
compute pipeline composed from user-supplied WGSL stages).
compute pipeline composed from user-supplied WGSL stages). The WebGPU
path supports triangle and AABB (procedural, `VK_GEOMETRY_TYPE_AABBS_KHR`)
geometry, closest-hit / miss / any-hit / intersection shaders — see
[examples/RTVolume](examples/RTVolume/README.md) for procedural spheres
shaded through an intersection shader with an any-hit cut-out.
> **Native RT status:** reading an acceleration structure through
> `VK_EXT_descriptor_heap` currently aborts with `VK_ERROR_DEVICE_LOST` on