message: Create "default" glTF material as OBJ, so SciVis looks correct.
diff: @@ -218,7 +218,7 @@ namespace ospray {
  ospMaterials.reserve(model.materials.size() + 1);
  // "default" material for glTF '-1' index (no material)
  - ospMaterials.emplace_back(createNode("default", "principled"));
  + ospMaterials.emplace_back(createNode("default", "obj"));
  // Create materials (also sets textures to material params)
  for (const auto &material : model.materials) {
  