Fix point mapping to sphere

[Norgg]

Currently entity points don't wrap around the sphere correctly, it looks like they're wrapping around at twice the radius.

The collision detection probably needs updating for larger objects too.

[Norgg]

Still issues with collisions with huge entities which we generally work around by no having anything huge enough for it to be a problem.

It's only really visible when something is taking up like 1/3 of a sphere, which doesn't look great anyway.

Fixing it would involve going through the geometry of the collisions in detail.