And why am I getting that "wire shader" effect? I would think that I'd be sampling the virtual geometry normal's derivative (i.e. the smoothed out normals interpolated across the facet). Sampling the raw geometry seems useless to me. I want to track the apparent curvature that is visible in the actual render, not the literal piece-wise flat geometry of the model. Of course the dNdv is near zero for pixels inside a facet. So I ask again, how is that useful? The discontinuities produced in sampling the derivative of the normals on the raw geometry seems to me to make it useless.

---

Renderosity forum reply notifications are wonky. If I read a follow-up in a thread, but I don't myself reply, then notifications no longer happen AT ALL on that thread. So if I seem to be ignoring a question, that's why. (Updated September 23, 2019)