VRCTrace

Software GPU Ray Tracing for VRChat

How to use

Add VRCTraceManager to a gameobject and press Generate Buffers to create a BVH for static objects in the scene.

Example Shader

#include "Packages/com.z3y.vrctrace/Runtime/Shaders/VRCTrace.hlsl"

...

Ray ray;
ray.D = rayDirection;
ray.P = RayOffset(positionWS, normalWS);

Intersection intersection;
if (SceneIntersects(ray, intersection))
{
    float3 hitP, hitN;
    TrianglePointNormal(intersection, hitP, hitN);
}

Raytraced Reflections

• Requires one baked lightmap referenced on the VRCTraceManager and a skybox cubemap for miss
• Press Generate Combined Atlas
• This will create a new combined texture using the meta pass (lightmap * albedo + emission)
• Shaders can then sample this atlas using hit UVs for the reflection

Adapted from Sebastian Lague's ray tracing tutorials.