This page provides information on the Z-Depth Node in V-Ray for Blender.
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||Node Editor|| > Add > Render Channels > Z-Depth
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The Z-Depth Render Channel parameters for minimum and maximum depth, Black Distance/Depth Black and White Distance/Depth White, can be set to various values to provide different ranges of depth in the render element. In these examples, Depth Clamp is enabled.
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The Z-Depth Render Element is useful for adding depth of field to the final image in post production using a compositing application without the need for re-rendering.
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Depth of field applied to composite
using the Z-Depth Render Element
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