15. Specular reflection
• Angle of reflection
– is angle of
incidence 𝜃
• Highlights
– More reflection
near to the angle
of reflection
– Phong model
• Proportional to
cos 𝑛 𝜃
16. BRDF
• Any refection
• Bidirectional
Reflectance 𝜔𝑜
𝜔𝑖
Distribution Function
– 双方向反射分布関数
• 6 parameters
– Point 𝑥, angles of 𝑥
incidence 𝜔 𝑖 and
reflection 𝜔 𝑜
• If isotropic and
homogeneous
– 3 parameters
23. Subsurface scattering
• Transmitted light
– Non-metal
• Scattering
– Inside medium
– Some come the
surface
– Some absorbed
• Outgoing light
– From a point
different from the
incident point
50. Plane-parallel approximation
• Dipole
Single layer, semi-infinite
• Multipole
Finite-thick layers
• Semi-infinite plane
medium
– Depends on the Layered homogeneous
depth 𝑧 from the
surface
– Plane-parallel