Re: Sin PHYSICS
Collisions are very complex in the Source engine, to say the least.
Take for example the collision area for a trashcan.
What may not be obvious about concave objects is their more elaborate collision interactions.
When some props are created an additional collision mesh is often created to accommodate the concave area.
Take for example the interactions of HL2 Plastic crates within water volumes.
The Source engine in-game physics for the Player and objects is spectacular but not without limitations or oddities.