message: Better backwards compatibility in quad importer
diff: @@ -282,10 +282,11 @@ namespace ospray {
  size_t i = 0;
  for (int numVertsInFace : shape.mesh.num_face_vertices) {
  auto isQuad = (numVertsInFace == 4);
  - auto lastIndex = isQuad ? 3 : 2;
  - auto prim_indices = vec4i(0, 1, 2, lastIndex);
  + // when a Quad then use same splitting diagonale in OSPRay/Embree as
  + // tinyOBJ would use
  + auto prim_indices = isQuad ? vec4i(3, 0, 1, 2) : vec4i(0, 1, 2, 2);
  vi->push_back(i + prim_indices);
  - i += lastIndex + 1;
  + i += numVertsInFace;
  }
  for (size_t i = 0; i < numSrcIndices; i++) {
  