Light

From Schmid.wiki

Vocabulary

With danish translations where appropriate

Reflection types


Specular reflection: Angle of incidence equals the angle of reflection
Diffuse reflection: Angle of reflection is random (due to irregularities in surface).
Lambertian reflection: A special case of perfect diffuse reflection where luminance of reflected light is equal regardless of angle of view

The amount of light that passes through or is emitted from a particular area, and falls within a given solid angle.

Luminance is defined by

$L_v = \frac{d^2 F}{dA\,d{\Omega} \cos \theta}$

where

L v

is the luminance (candela/m²),

F

is the luminous flux or luminous power (lumen),

θ

is the angle between the surface normal and the specified direction,

A

is the area of the source (m²), and

Ω

is the solid angle (Steradian).

A local illumination model considers only the surface we're rendering and the light sources. A local illumination model yields no shadows.