Best way to scale and rotate Models ?

I call it in the main loop (specifically, I call it from a function, but that's in the main loop). As far as I know that's where it should be called since UpdateWorld() also tends to be in the main loop...

I'd suggest putting it in your DropItems function and calling that only once per loop.

Also, Ross, it's

Collisions First_Entity's_Type,Second_Entity's_Type,2,2

Not entities in specific :)