User Manual

Nodes That Use Auxiliary Channels
The availability of auxiliary channels opens up a world of advanced compositing functionality.
This section describes every Fusion node that has been designed to work with images that
contain auxiliary channels.
Copy Aux
The Copy Aux tool can copy auxiliary channels to RGB and then copy them back. It includes
some useful options for remapping values and color depths, as well as removing
auxiliary channels.
Channel Boolean
The Channel Boolean tool can be used to combine or copy the values from one channel to
another in a variety of ways.
Custom Tool, Custom Vertex 3D, pCustom
The “Custom” tools can sample data from the auxiliary channels per pixel, vertex, or particle
and use that for whatever processing you would like.
Depth Blur
The Depth Blur tool is used to blur an image based on the information present in the Z-Depth. A
focal point is selected from the Z-Depth values of the image, and the extent of the focused
region is selected using the Depth of Field control.
Disparity to Z, Z to Disparity, Z to WorldPos
These tools use the inherent relationships between depth, position, and disparity to convert
from one channel to another.
Fog
The Fog tool makes use of the Z-Depth to create a fog effect that is thin closer to the camera
and thickens in regions farther away from the camera. You use the Pick tool to select the Depth
values from the image and to define the Near and Far planes of the fog’s effect.
Lumakeyer
The Luma keyer tool can be used to perform a key on the Z-Depth channel by selecting the
Z-Depth in the channel drop-down list.
Merge
In addition to regular compositing operations, Merge is capable of merging two or more images
together using the Z-Depth, Z-Coverage, and BG RGBA buffer data. This is accomplished by
enabling the Perform Depth Merge checkbox from the Channels tab.
Chapter – 69 Understanding Image Channels 1405