[ODE] Flat cylinder geom come to life!

[John Miles]

There are at least a couple of good uses for true plane geoms:

1) As a backstop beneath a TriMesh terrain to catch anything that falls
through the terrain.  (Unlike a trimesh, nothing can fall through a plane
because the entire back halfspace is "inside" the plane.)

2) As a primitive to base other primitive implementations upon (e.g., height
maps).

I'd like to see planes continue to be supported as a first-class primitive.

-- jm


> >      So there are no cylinder vs plane in Croteam's side. (Am I right
> >      Alen ???).
>
> Yes, you are right. Plane is a very degenerate piece of geometry, which is
> not very useful in a game, only as floor in test scenes. So we've spared
> ourselves one count of N in the NxN collider matrix, by just
> puting a large
> box for floor in test scenes. :)
>
> It should be fairly easy to model it by just stripping a box-cylinder
> collider off all axes except for the top face.
>
> Cheers,
> Alen
>