2d rectangle in a 3d world

Hi!

Please, see the images below to understand my problem (my english is so bad…)

I’m trying to paint a 2d rectangle in a point of a 3d world. I need that this rectangle doesn’t have any deformation and i need it with a know size (in pixels). Now i can do that painting with the projection gluOrtho2D, but i have a problem, the Z Buffer doesn’t work (i know that its no correct). Any idea how to do that?

Now:

Expected:

thanks in advance!

Search billboarding

Orienting the polygon based on the view direction is called billboarding…
(First entrance at google)

Now i know what was my problem :slight_smile:

A lot of thanks, zbuffer!