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Gah, BSP collision detection

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So for the past few evenings I've been working on fixing my BSP collision detection. I found out it was too simple to just take the bottom of the current leaf as the floor :)

So I've been testing all kinds of stuff, and it just wouldn't get it right. I've been going through a simple level by hand and it seemd to go to the wrong leaf at the end. Then yesterday I finally found out I had to get leaf number -(leaf+1) instead of -leaf.

Then this morning I checked the docs to see if that was in there as well, and it was :(. That'll teach me to read quickly! But at least now it's working :D Next stop is fixing the quaternion interpolation in the Doom3 models.
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