[ODE] GIMPACT with doubles

[Pierre Terdiman]

> This is not true, many collision routines calculates the global space
position.

...using computations in relative space, yes.

As I said, you only need doubles for world-space positions. It doesn't mean
you should perform the whole contact generation in world-space.

I'm just pointing out that a physics engine can work perfectly well (very)
far away from the origin using doubles for just the world-space positions in
the engine, which means the memory overhead can be very small.

- Pierre