The Bump Normals Render Element creates a normal-style image from the camera view from bumps and normals in the scene. The normals are generated using screen space (the Screen coordinate system in 3ds Max) which uses the XYZ orientation of the camera view. With Screen space, the X axis runs left-right across the view, Y runs up-down, and Z points out of the screen. Bump maps are also represented in this render element. For a diagram that illustrates how normal-style colors are generated, see the Normals (VRayNormals) page. This render element is similar to the Normals (VRayNormals) Render Element that does not include bump maps. Also compare with Sampler Info (VRaySamplerInfo), which can render a normal map in object or world space in addition to camera (screen) space. The Bump Normals Render Element is useful for adjusting lighting that comes from a particular direction. For example, faces of objects pointing toward the camera are predominantly blue in VRayBumpNormals, so the lighting on such objects can be adjusted by using the blue channel in compositing software.
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