Hans Goudey
8f89196be2
If the input mesh had no materials already, the new material would become the only material on the mesh, meaning the material was added to all of the faces, instead of just the selected faces. The mesh primitive nodes in geometry nodes already add an empty slot by default, so this only affects outside geometry. The fix is just adding an empty slot before the new slot, so the non-selected material indices can still point to an empty slot. Differential Revision: https://developer.blender.org/D13654