Using vex functions primduv, Du, and Dv in sop context?

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Just wondering if its possible to use these functions in a wrangle in a sop context. So far I cannot get them to output anything, and am confused as to how they work. I'm curious as they might be helpful for me. Anyone ever use these in a sop context and if so could you explain what they do or provide an example?
Edited by mbbuckley - June 28, 2018 17:23:17
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nope, surface context is required for derivatives, as they only take derivatives with respect to screen space position.
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Ok thank you
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