I use this line in my code for the movement and gravity for my player.

if (c_trace(my.x,vector(my.x,my.y,my.z-5000),IGNORE_ME | IGNORE_PASSABLE | USE_BOX) > 0)

Question:

How do I manually program where the use_box will be on the player model. Because my model (selfmade) need to get his box adjusted... when I hit F11 the box is at the models knees , but I need it to be at the bottom of the models shoes.

So how manually write the code that are needed to say where the box is?