CAD program for make video game stuff.
Accepted answer
2 Other answers
This is called "asset" in the game field. They are prepared by several team, modeler artist, UV texture artist, shader artist... and nowaday, each of them used specialized software. For most modern game they share the same goal, make the game as realist as possible while taking less resources as possible.
Talking about modeling, software are divided into 2 world, parasolid one (like catia, NX...), mesh one (like 3Dsmax, maya) and Rhino that stand in beetween.
I don't think that CAD software are used for game engine, i advice you to look for game engine forum instead of CAD forum to grab more accurate information.