Hello I’ve had Half life 2 for years now and i wanted to know to fix models.
For example the elite and regular combine soldiers have a one sided bullet-proof vest. I was wondering what kind of program to use to carve it so both sides can be equal. It just makes them look fat.
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Well there’s many 3d animation/modeling programs out there

I use Softimage Mod Tool 7.5
The sourceSDK had official plugins for it

But mostly everyone else uses either Blender

or 3DS Max

Valve uses Maya

They can all do the same things but the way they work is VERY different
choose wisely