How do I create a collision mesh?

[mo_gudu]

A newly created ship module that can be used in the game. There is no physical collision, either with the ship or with the weapon, it goes straight through, and creating a collision mesh in the same way as the game model has no effect.
How do I create a collision mesh for a new ship module?

[CBJ]

This is a modding question, not a Tech Support question. Moving over to the correct forum.