message: Give MaterialRegistry default material a unique name so it doesn't collide
diff: @@ -16,7 +16,7 @@ namespace ospray {
  void MaterialRegistry::addNewSGMaterial(std::string matType)
  {
  if (!hasChild(matType)) {
  - auto node = createNode("default", matType);
  + auto node = createNode("sgDefault", matType);
  auto &mat = *node;
  // Give it some editable parameters
  mat.createChild("kd", "rgb", "diffuse color", vec3f(0.8f));
  