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Filtering – Applies the image filter to this channel. Image filter settings are in the Image Sampler tab in the VRayRenderer properties.

Common Uses - Relighting

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The Bump Normal Render Element is useful for changing the appearance of lighting in a scene in a composite without the need for re-rendering. In the example below, a lighting workflow is used at a composite level to change the lighting in the scene. Note that it does not create any extra shadowing. While the Bump Normal Render Element provides information about how lights will affect each surface, the Point Position element passes the spacial location of each pixel.  When used together, it allows lights added in compositing to react to the pixels as if they were on the surface of the model.