Driving CutMap with Vector Paint
Having a compositor built into a 3d program offers a new way to drive any parameter in the 3d app. Softimage (as well as Blender & Houdini) has an intergrated compositor. This tool opens many possiblilties. Here I used a Vector Paint node in Softimage's compositor to drive the value of a CutMap parameter on hair (grass). The effect works perfectly and can be tuned interactively in a 3d viewport.
If you are a Softimage user, download the supplied scene file below to view the setup:
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Derek Jenson Blog
My website serves to archive experiments, document projects, share techniques, and motivate further exploration & artistry in 3d space.