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FINALLY! the first simplified mesh for the lod generation that seems to work! I should flat-shade for further tests to be able to see the edges and faces

technically this is not done, because unused, old vertices aren't removed yet. but that's trivial.
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fun fact: the more aggressive you reduce the amount of triangles with this algorithm, the faster it runs.
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mesh simplification/ LOD generation

left: 2 million triangles
right: 900 triangles
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