Simplification without texture distortion

[adam-ce]

Currently, textures are warped during simplification. This is, because the uv space gets reparametrised, and it shifts when vertices are removed.

here are some papers that deal with that:

• Accurate Simplification of Multi-Chart Textured Models (N. Coll, T. Paradinas) -> what we need. only i didn't find an implementation.
• Simplification, approximation and deformation of large models (PhD thesis, Paradinas) -> some more from the same author.
• Mesh Simplification With Appearance-Driven Optimizations (YONGZHANG XIAN et al) -> looks good as well, no implementation found

also look through the references in here.

• generate an automated pipeline to asses the distortion
• check whether we can minimise them enough using our current pipeline
• if not: read through the papers and references above, and decide on an implementation
• implement