The Z-Depth Render Element is a grayscale image that renders each pixel based on its distance from the camera in the view.
UI Path: ||Render Settings window|| > Render Elements tab > Z-depth
The parameters for this render element appear in the Attribute Editor under Extra V-Ray Attributes.
Enabled – When checked, the Z-Depth pass appears in the V-Ray Frame Buffer.
Deep output – Specifies whether to include this render element in deep images.
Use depth from the camera – Specifies whether to use to camera clip boundaries as the minimum and maximum Z-Depth distance. Enabling this option disables the Depth Black and Depth White parameters.
Depth Black – Objects further than this distance from the camera will render as black. This option is available only when Use depth from the camera is disabled.
Depth White – Objects up to this distance from the camera will render as white. This option is available only when Use depth from the camera is disabled.
Depth Clamp – Clamps the Z-Depth colors to a linear 0-1 range.
Filename suffix – The text added to the end of the rendered file, when saved as a separate file (e.g. myrender.zDepth.vrimg).
Filtering – Applies the image filter to this channel. Image filter settings are in the Image Sampler rollout in the VRay tab of the Render Settings.
The Z-Depth Render Element parameters for minimum and maximum depth, Depth Black and Depth White, can be set to various values to provide different ranges of depth in the render element. In these examples, clamp zdepth is enabled.
Use depth from the camera has been turned on
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. It can also be used to create basic fog by overlaying it on the composite with Add mode or Screen mode, with color correction as needed.
Depth of field applied to composite
using Z-Depth Render Element