base webgpu LBVH builder forked from here
and optimized by RayTraceX for real-time ray-tracing (with dynamic scenes)
LBVH build time on Vega7 (5600G iGPU) :
[264 tris] scene 1 (animation) 2.9 ms
[156 tris] scene 2 (simple) 2.2-2.7 ms
[218,724 tris] scene 3 (chess) 12.5 ms
You can try the demo here - just load scene by button (or just drag and drop an .obj model)