Is there a reason certain vertices won't weld in 3DS, I have two vertices that by all means should be able to weld, They are both part of the same object and everything, but won't, any advice?
yup, when you've got the cylindrical button turned on the cylinder gizmo will have a green line on one side to indicate where the split will be. you can collapse the stack and put another symmetry on top to mirror the UVs for the whole mesh. or if you just want part of the mesh to be symmetrical you can detach that part…