Or you can select by polygons limited by angle. If you keep the angle something around 15-30 degrees, your selection will not bleed over the collar, and will just select the inner surfaces. another way is to apply a autosmoothing group to the whole mesh, and then just select by the 1 smoothing group that makes up the…
Hey guys thanks for the response, the painting actually works well but still pretty tedious but way better than one by one. Ive come up with other solutions, one is the select all the outer polygons by hand, or painting, and then simply Ctrl + I to invert and delete. Or Delete half (if object is symmetrical) and delete the…