- attempts to fix issue mentioned in #2417
- a bit of refactoring, more should come
- the sharp edges, ceases thing should be revisited

@alteredq seems like you forgot to upload textures/cube/Escher/dds/*.dds

@alteredq try this on your end whenever you can. Not sure if this was done like this because it created problems on angle or something.

However, it's not handling object removal yet. But I think I've an idea to handle all this stuff nicely...

Not sure if it works with Python 2.x. Can't test it... :-(

Fortunately here we don't need to flip the images.