Editing Bump mapping (section)

==Realtime bump mapping techniques==
[[File:FakeBump2D-animation.gif|thumb|right|400px|Example of a realtime fake bump mapping.<br> From left:
<ol>
<li> surface bitmap, intentionally blurry,</li>
<li> source of light bitmap,</li>
<li> bump mapping effect with light source orbiting <math>1=x^2+y^2/x^2</math> trajectory.</li>
</ol>
]]

[[Realtime 3D graphics]] [[programmers]] often use variations of the technique in order to simulate bump mapping at a lower computational cost.

One typical way was to use a fixed geometry, which allows one to use the heightmap surface normal almost directly. Combined with a precomputed [[lookup table]] for the lighting calculations, the method could be implemented with a very simple and fast loop, allowing for a full-screen effect. This method was a common [[demo effect|visual effect]] when bump mapping was first introduced.