Function postIntersect

tutorials/viewer/viewer_device.cpp:162–196

typedef ISPCInstanceArray* ISPCInstanceArrayPtr;

unsigned int postIntersect(const TutorialData& data, const Ray& ray, DifferentialGeometry& dg)
{
  AffineSpace3fa local2world = AffineSpace3fa::scale(Vec3fa(1));
  ISPCGeometry** geometries = data.ispc_scene->geometries;
  
  for (int i=0; i<RTC_MAX_INSTANCE_LEVEL_COUNT; i++)
  {
    const unsigned int instID = ray.instID[i];
    if (instID == -1) break;

    if (geometries[instID]->type == INSTANCE) {
      ISPCInstance* instance = (ISPCInstancePtr) geometries[instID];
      local2world = local2world * calculate_interpolated_space(instance,ray.time());

      assert(instance->child->type == GROUP);
      geometries = ((ISPCGroup*)instance->child)->geometries;
    }
#if defined(RTC_GEOMETRY_INSTANCE_ARRAY)
    else if (geometries[instID]->type == INSTANCE_ARRAY) {
      ISPCInstanceArray* instanceArray = (ISPCInstanceArrayPtr) geometries[instID];
      local2world = local2world * calculate_interpolated_space(instanceArray,ray.instPrimID[i],ray.time());
      assert(instanceArray->child->type == GROUP);
      geometries = ((ISPCGroup*)instanceArray->child)->geometries;
    }
#endif
  }

  ISPCGeometry* mesh = geometries[ray.geomID];
  unsigned int materialID = mesh->materialID;
  
  dg.Ng = xfmVector(local2world,dg.Ng);
  dg.Ns = xfmVector(local2world,dg.Ns);
  
  return materialID;
}

inline Vec3fa face_forward(const Vec3fa& dir, const Vec3fa& _Ng) {
  const Vec3fa Ng = _Ng;