Lecture 14: Material Modeling (19)
mhallac

In real applications for a material, how is the distribution of microfacet normals determined? Is it based on experimentation, or is there a procedure behind it?

Ant1ng2

I would imagine in practice that they shined a beam of light and measured the intensities, like something on https://cs184.eecs.berkeley.edu/sp21/lecture/11-45/radiometry-and-photometry

seohyunjeon

these diagrams show why hemisphere sampling performs poorly for glossy microfacet materials; the "relevant" reflections fall in the light blue area and few rays sampled with hemisphere sampling fall within the concentrated range and contribute little to the lighting we render.

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