Just select them all and lay them out together. They don't need to be attached or anything. In maya, you don't have to do anything special, in max you select them all and apply an unwrap uv modifier to the selection, and lay them out.
max already gives you a big freedom, so to answer your question: there is no wrong or right, but there are multiple ways of doing it. Lets say for example that you unwrap object by object (don't mind to much yet the layout) and then want to bring them together. Simply select all objects, add with all objects selected a…
Hi, if I understand correctly - you have your gun currently in several pieces and you´d like to put them together on one UV layout, yet then have them broken down back into pieces. If you´re using max, just attach the parts you have now so you´ll have it all as one object, apply unwrap UVW modifier (here you can either…