[PyOpenGL-Users] OpenGl + Mouse Selection

[Jasper P. <ja...@pe...>]

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I want to be able to "select" different entities rendered in OpenGL w/
a mouse -- essentially asking which shape the mouse pointer is over.
Ideally this could be used to select game pieces to move, etc.

This is fairly easy to compute when rending in an orthographic view, as you
can simply translate mouse coordinates to viewpane coordinates.  However,
this doesn't work well for perspective views!

It would be nice to simply ask opengl what lies behind a certain screen
coordinate, but I haven't been able to find anything amongst the "glut"
(rimshot!) of opengl documentation about this.

Has anyone here had any experience with something like this?  I suspect
there must be an easy way to do it, as obviously the information is
available inside of opengl.

- -Jasper

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