Update/Edt:
In the content library you can find a script to Create Advanced Iray Node Properties.
DAZ Studio Formats > My DAZ 3D Library > Scripts > Utilities > Create Advanced Iray Node Properties
While the use of "Iray Matte" is explained on the forum I was not able to find information about the "Iray Handle" parameter.
I put together an example how you can use the Iray Handle parameter in combination with the Iray Light Path Expressions:
https://www.daz3d.com/forums/discussion/comment/3436956/#Comment_3436956
I leave the first few posts of this thread as they are so you can track the progress of the discussion...
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You can also find the script in the "Default Resources" Product:
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"Enable Iray Matte"
I was able to follow the tutorials how to create "matte" objects to catch shadows in Iray.
compare:
Video: Matte Function in Iray DAZ Studio - Shadow Catcher #2
Related Forum post:
https://www.daz3d.com/forums/discussion/57051/how-do-you-create-a-shadow-catcher-in-iray
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Iray Handle
When using the script to
Create Advanced Iray Node Properties
there is also an entry created called "Iray Handle"
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Observations:
It seems you can enter a name.
In the example I entered "ground plane".
A handle may be something like an "object id" that then can be used to call that object in some other functions.
But I was not able to find any information how it is used in the Iray integration for DAZ Studio.
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Questions:
1) How is this "Iray Handle" used in DAZ Studio?
2) Why do users have to run a script to show the parameters "Enable Iray Matte" and "Iray Handle"?
Can users break any functionality if they experiment with those settings without knowing what exactly to do?
Why are those settings not shown by default?