# Lambertian reflectance

A lambertian object obeys Lambert’s cosine law.

Color of a surface is proportional to the cosine of the angle between surface normal and direction to light source

c ∝ cos θ 

Observations:

• If a surface points away from light, it should receive no light.
• Smaller angles -> higher chance that light is reflected back
• Larger angles -> reflection light gets weaker, it is likely shadowed/masked
• No dependence on camera angle

References: Tutorials Point