Where is the collision testing?

Marcus wrote:
>I searched the code (obviously not long enough or not systematically) for
>the part where the collision of the avatar is tested against its
>surroundings.
>
>Usually the avatar either climbs up or goes through solid walls.. but where
>is this decided in the code?
>
>Could you please provide some hints?

In most of the demos, the only test that is done is for the "floor".
This is done in the TAvatarReplica (or subclass) #fall method using
the downPointer, which is a TRay instance.