well, if you are using sprites then you will be doing all of it in 2d.
if your wanna put 3d over 2d tho all you do is change the cameraclsmode
that stops renderworld from clearing the screen before drawing any 3d objects. :)
if your wanna put 3d over 2d tho all you do is change the cameraclsmode
CameraClsMode camera,False,True
that stops renderworld from clearing the screen before drawing any 3d objects. :)