Revision as of 04:44, 29 July 2014

Overdraw

Overdraw means a screen pixel is being drawn more than once. Overdraw can increase the fill rate, how fast the game can render each frame, slowing down the frame rate. Re-rendering each pixel more than once is usually a waste of processing time.

Overdraw should be avoided whenever possible, however it is required if triangles are partially transparent, because the surfaces must be mixed together to create the final screen pixel.

Overdraw is usually caused by multiple triangles being drawn over each other, for example with particle effects or tree foliage.