Which is 255.
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You read it? :)
I know this has been long since left for dead, but I figured it out! The grey map provides a basis, in which in full, for better imaging, can be increased based in thickness of the grey map! It certainly works better than 3D Mesh, for making games anyway, but how could you create a world out of it... I'll try to make a Mode world and get back to you!