Help with X_WORLD2SCREEN - X_SCREEN2WORLD,please.

[equinox]

Hi at all,

I do not succeed to understand how they work these functions.  Someone it has been things' kind to explain me it it, even if with an example? 

Tnk1000.

[Kitty Hello]

They translate a 3D point in your scene to the 2d mapping of the pixel on the screen and vice versa.