Watch this 1st Sample Lecture from vol100.
This video demonstrates the use of the Wedge ROP in the Render Outputs (/out) of Houdini.
Wedging help cycle though many nested parameter values efficently, avoiding desperate second guessing.
I show how the Wedge ROP and Mantra ROP function together, what the $WEDGE variible does, and how to set the proper paths for the Wedge to work.
Watch this 2nd Sample Lecture from vol100.
This video shows how to create a wedge without using the Wedge ROP.
You may wonder, "What's with that, Garman?"
Better watch and find out how to make your own home-grown wedge tool.