My model must support transfer textures but I can't do this using mesh + modelBuilder.part
Opacity is tested correctly on only half of the model.
BlendingAttribute blendingAttribute = new BlendingAttribute();
blendingAttribute.opacity = 1.0f;
modelBuilder = new ModelBuilder();
modelBuilder.begin();
modelBuilder.part("minecraft:loading_model", mesh, 4, new Material(TextureAttribute.createDiffuse(atlas), blendingAttribute));
modelInstance = new ModelInstance(modelBuilder.end());