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Thank you for the help.

I guess for my purposes the best course of action would be to build the surface shader as if the Geo data is available, and then manually edit it and throw in the geo function to populate the data?

Hi.

We have a wireframe shader that calculates the barycentric coordinates in the Geometry program, and out puts is into the triangle stream. Looks like this:

// inverseW is to counteract the effect of perspective-correct interpolation so that the lines
// look the same thickness regardless of ...