The AOV Write shaders allow you to write float, int, vector, or color data to custom AOVs.
Passthrough
Allows parallel evaluation in a shader network.
AOV Input
Input float value to write to the AOV.
AOV Name
Name of the AOV.
Blend Opacity
For transparent surfaces, this controls if only the first surface writes to the AOV, or if the value from all transparent surfaces is blended together.