From Mihai Radu, "After someone asked for a fix for non-textured object appearing black
with the shader for textured objects. This works very well in cases
where there could be a mix of textured and non-textured objects in the
scene, and it makes the initialization more robust.
The idea is from PSSM, to add a 1pixel texture to the main rendering as
to provide white for any objects missing textures."
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