Yesterday, I wanted to cut off (using scalpel) parts of geometry that are transparent (in texture). But, I have found that scalpel tool is messing UV coordinates. It would be much easier with preserving UVs.
Sorry - can´t reproduce it here. Maybe you´re scalping with attached subdivision-modifier?
At least you don´t have to unwrap the whole mesh again and you can pin the surrounding verts to avoid any issue you might run into.
This sounds tricky to implement when you start slicing inside of irregularly shaped ngons, so at the very least it would be nice to turn off UV updates until you are finished slicing so that you can tell where to cut.
I also would like to be able to use the scalpel on a mesh without destroying the UV mapping inside scalpel-cut polys.
I'm talking about a mesh with no modifiers.
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