I've only been exposed to car glass before, so let me talk about my knowledge of car glass.

1, 3D modeling of glass, and 3D data of glass can be generated by UG.

2, glass mold design, if you want to make it, you always need to use the mold.

3, glass assembly line design, now is not a manual workshop, assembly line production can improve efficiency.

4, glass tooling design, some rubber strips and buckles on the glass need special tooling to complete.

5. The design of glass fixture, finally the glass came out, but whether it can reach the design data still needs fixture to test.

Generally speaking, I can only understand these. I hope I can help you. Welcome questions.