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The most common usage of the Z-Depth Render Element is as a control for depth of field in the composite. Depth of field can be challenging to do correctly, requiring many tweaks and re-renders; using the Z-Depth Render Element in a composite is usually much faster , and allows easier and faster adjustment than trying to get it exactly right within the render. 

UI Path: ||V-Ray|| > Render Elements > ZDepth

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How to add a render element to a scene

Enable Deep Output – Specifies whether to include this render element in deep images.

Depth from Camera – Specifies whether to use to camera clip boundaries as the minimum and maximum Z-Depth distance, even if camera clipping is disabled. The camera clipping boundaries can be found in the Details tab of each camera object. Enabling this option disables the the Depth Black and and Depth White parameters.

Depth Black –  Objects up to this distance from the camera will render as black. 

Depth White – Objects further than this distance from the camera will render as white. 

Depth Clamp – Clamps the Z-Depth colors to a linear 0-1 range.

Filtering – Applies an image filter to this channel.

Depth Invert – Inverts the colors of the Z-Depth render element. Objects closest to the camera render as white, while those furthest away are black.

Force Infinity Black – When enabled, overrides the infinity color, turning it black. Everything beyond the Depth White amount (if not using Depth from Camera) is the infinity color.

Dont Filter Env – When enabled, only outlines of overlaying objects are filtered. When Filtering is enabled, and Dont Filter Env is enabled, pixels bordering scene objects and the environment remain unfiltered, while pixels bordering different objects are still filtered.

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