Fix the logic that decided which edges were to be added to smooth the clipping
hulls. The original logic is completely backwards and throws away all the hull
edge clipping planes you want, while potentially keeping the worst corner
cases.
This patch corrects that logic - for that reason, regressions are expected as
we will now be adding more planes to the maps and clipping more things at
wierd angles. Compile times will probably increase and clipping errors will be
more common, at least until some more tuning of the various epsilons is done.
While we're hacking the function, hoist some calculations from the inner loops
up to the outermost loop. Not that this function is that performance critical.
Signed-off-by: Tyrann <tyrann@disenchant.net>
5b9cb50f11