Thanks for letting me know about this. However, Even with this change, I'm getting the same error. Any other ideas as to why this is happening?
Error: L_14: Unresolved symbol: "unpackSurface(1)"
function void Eval()
int4 hit = scene.intersectExt(
float3 nml = scene.unpackNormal(hit);
int st = scene.unpackSurface(hit);
Edit: The issue only happens with scene.unpackSurface()