Projection from world to screen coordinates

I have 4 positions in the “real world” of my game. I want to know where they end up on the screen (e.g. in the mouse [-1…1]/render2d system), so I can check whether I am outside the bounds of my map.
Is there an easy way to perform the projection of coordinates relative to some NodePath to 2D screen coordinates?
This is the fastest way I can think of. Using a collision system seems overkill (and that works the other way around, when there is missing data).

Thanks!

[edit]
Well, have a look at this thread. Guess that solves it. Didn’t use the right keywords for search.