message: gltfpack: Preserve material names
  We now keep material names similarly to node names - this can be
  valuable for applications that need to change material parameters at
  runtime.
diff: @@ -1840,6 +1840,14 @@ void writeMaterialInfo(std::string& json, const cgltf_data* data, const cgltf_ma
  static const float white[4] = {1, 1, 1, 1};
  static const float black[4] = {0, 0, 0, 0};
  + if (material.name && *material.name)
  + {
  + comma(json);
  + append(json, "\"name\":\"");
  + append(json, material.name);
  + append(json, "\"");
  + }
  +
  if (material.has_pbr_metallic_roughness)
  {
  const cgltf_pbr_metallic_roughness& pbr = material.pbr_metallic_roughness;
  