cs781 - Colour for Computer Graphics - Winter 2012

Course Notes

Lecture 13 - Light in Motion

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Surface Reflectances

According to Jim Kajiya, writing in the mid 1980s,, the Bidirectional Reflectance Distribution Function (BRDF) should tell the whole story. What is it, and where does it come from?

Maybe it could come from measurement

Maybe you could simulate the system

Maybe you could find a simple model

Smooth Surfaces

Surface reflectance

Body reflectance

Lambertian reflectance

Lambert 1728-1777

Consider a small circular hole in the surface and ask how much light comes through it in different directions

The luminance of light in any direction is constant.

When the volume immediately below the surface has spatial structure, the direction of light re-emitted through the surface is not necessarily isotropic.

The Moon

Rough Surfaces

Surface Reflectance

Surface Gloss


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