Advantages
The primary advantage of deferred shading is the decoupling of scene geometry from lighting. Only one geometry pass is required and each light is only computed for those pixels that it actually affects. This gives the ability to render many lights in scene without significant performance-hit. There are some other advantages claimed for the approach. These advantages may include the simpler management of complex lighting resources, ease of managing other complex shader resources and the simplification of the software rendering pipeline.
Read more about this topic: Deferred Shading
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