I have a tree model that I want to use, but when I place it in the game, it has a black box around the leaves. How do I make the black part transparent? Am I still able to animate the tree (like move the leaves in the wind a bit) without the black box around it?

if it's totaly black (0,0,0) use my.overlay = on; But if you want more smooth edges you have to use an alpha texture (tga) as skin for the tree.

Would I need to specify that in the model's action function?

Wait, nevermind, I got it now. Thank you for all the help! it works perfectly!