View Full Version : Selection Buffer question...

03-19-2001, 12:16 AM
I have read some stuff about selection buffer and i have understood that you must render the scene 2 times, one time for selection, the other time for "colors" (i don't know in wich order). So i would like to know if it's not too slow, especially for commercial game like Quake III Arena, and if so, what techic do they use.

Thanks by advance.

03-19-2001, 12:44 AM
The selection buffer in OpenGL is generally not too optimized on todays consumer level hardware, and therefore might be a somewhat slow. But if you are looking for other ways, you can see selection as just another form of collision detection. Cast a ray from the viewpoint through the pixel you click on, and see if that ray intersects any objects. That is one way to do it.