message: Repair gltf_viewer by calling Material::init.
diff: @@ -155,6 +155,7 @@ std::string shaderFromConfig(MaterialConfig config) {
  Material* createMaterialFromConfig(Engine& engine, MaterialConfig config ) {
  std::string shader = shaderFromConfig(config);
  + MaterialBuilder::init();
  MaterialBuilder builder = MaterialBuilder()
  .name("material")
  .material(shader.c_str())
  