Deferred shading
Screen-space shading technique / From Wikipedia, the free encyclopedia
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In the field of 3D computer graphics, deferred shading is a screen-space shading technique that is performed on a second rendering pass, after the vertex and pixel shaders are rendered.[2] It was first suggested by Michael Deering in 1988.[3]
On the first pass of a deferred shader, only data that is required for shading computation is gathered. Positions, normals, and materials for each surface are rendered into the geometry buffer (G-buffer) using "render to texture". After this, a pixel shader computes the direct and indirect lighting at each pixel using the information of the texture buffers in screen space.
Screen space directional occlusion[4] can be made part of the deferred shading pipeline to give directionality to shadows and interreflections.