Function pushInstanceId

tutorials/user_geometry/user_geometry_device.cpp:43–50

RTCFilterFunctionN sphereFilterFuncPtr = nullptr;

inline void pushInstanceId(RTCRayQueryContext* ctx, unsigned int id)
{
#if RTC_MAX_INSTANCE_LEVEL_COUNT > 1
  ctx->instID[ctx->instStackSize++] = id;
#else
  ctx->instID[0] = id;
#endif
}

inline void popInstanceId(RTCRayQueryContext* ctx)
{