Function createInstance

tutorials/user_geometry/user_geometry_device.cpp:206–239

}

Instance* createInstance (RTCScene scene, RTCScene object, int geomID, const Vec3fa& lower, const Vec3fa& upper)
{
#if !ENABLE_NATIVE_INSTANCING
  Instance* instance = (Instance*) alignedUSMMalloc(sizeof(Instance),16);
  instance->type = USER_GEOMETRY_INSTANCE;
  instance->object = rtcGetSceneTraversable(object);
  instance->lower = lower;
  instance->upper = upper;
  instance->local2world.l.vx = Vec3fa(1,0,0);
  instance->local2world.l.vy = Vec3fa(0,1,0);
  instance->local2world.l.vz = Vec3fa(0,0,1);
  instance->local2world.p    = Vec3fa(0,0,0);
  instance->geometry = rtcNewGeometry(g_device, RTC_GEOMETRY_TYPE_USER);
  rtcSetGeometryUserPrimitiveCount(instance->geometry,1);
  rtcSetGeometryUserData(instance->geometry,instance);
  rtcSetGeometryBoundsFunction(instance->geometry,instanceBoundsFunc,nullptr);
  rtcSetGeometryIntersectFunction(instance->geometry,instanceIntersectFuncPtr);
  rtcSetGeometryOccludedFunction (instance->geometry,instanceOccludedFuncPtr);
  rtcCommitGeometry(instance->geometry);
  rtcAttachGeometry(scene,instance->geometry);
  rtcReleaseGeometry(instance->geometry);
  return instance;
#else
  Instance* instance = (Instance*) alignedUSMMalloc(sizeof(Instance),16);
  instance->type = USER_GEOMETRY_INSTANCE;
  instance->geometry = rtcNewGeometry (g_device, RTC_GEOMETRY_TYPE_INSTANCE);
  rtcSetGeometryInstancedScene(instance->geometry,object);
  rtcSetGeometryTimeStepCount(instance->geometry,1);
  rtcCommitGeometry(instance->geometry);
  rtcAttachGeometryByID(scene,instance->geometry,geomID);
  rtcReleaseGeometry(instance->geometry);
  return instance;
#endif
}

void updateInstance (RTCScene scene, Instance* instance)
{