Gil,
I am working on 3D at the same time, but have run into a different problem with that.
I have a model made in "Sketchup 2017 Make", added materials to the model. I then exported the .obj file and the associated .mtl file and put them in an "images" subfolder of my xlights "3d" show directory.
When I click the little "Add obj" button, select "Add Mesh", click the OBJ file and navigate to the .obj file and select it, the model shows up on the grid, but in very pastel washed out colors.
How do I get it to load the materials also?