Lecture 14: Material Modeling (19)

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?


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


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.

You must be enrolled in the course to comment