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Gmod Inflation Tutorial Part 3a: The Joint Tool — Description
Now we're getting to the good stuff, the inflating! Or expanding if you prefer.

Using the joint tool is definitely the easier of the two methods I'll be talking about. First, pose your model in a rough position of the pose you want (if they're gonna be standing up, have them standing up. If they're gonna be lying down, have them lying down etc.). Then:

1. whip out that Joint tool from the tool gun menu on the right
2. point it at your model and right click
3. open up the context menu with "C" and go nuts

If you gotten this far, you should see a white rectangle with a lot of bone names in it. Clicking on these names will display a menu for each individual bone where you can change the size, shape and orientation of that bone with many dials. Sometimes, messing around with the dials won't do anything noticeable, but most of the time it will. The only thing to do now is to mess around with these dials and find out what each one does (if you're not sure). Once you've found the bones and the dials for the bones you need, just grow,shrink and move them around until it looks just right.

If this doesn't make much sense to you, try it out on your own! Trust me, with stuff like this it's easier to learn from experience than an online tutorial, but this is a great way to get started!