If I have a complex shape made of exterior points in 3D space how can I assign weights to them

So what I want to do is to create physics for 2 characters if they were off balance I want to make them fall in a natural way. Whatever kind of method I would use would probably take too long for my game engine, but I could save these values. I really want to find a relation volume of what would be inside the shape if it were solid

 

Hi Al.

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