All Things Kaneva
Player-Object Collision

That’s right, player-object collision can now be detected via lua scripts in 3D Apps!

If you’re annoyed with those pesky triggers, and how they are only spherical in shape, you now have another option.
Making oddly shaped floor pieces drop out from beneath a player’s feet is much easier.
You also don’t have to worry about that annoying thing where triggers only check the point right between the player’s two feet.
Collision is detected throughout almost the entire player body which means items can be at places other than ground level.

See the documentation here:
http://docs.kaneva.com/mediawiki/index.php/3DAPP:objectSetCollision
http://docs.kaneva.com/mediawiki/index.php/3DAPP:kgp_collide

Polygon optimization techniques (mostly for Kaneva).