檢視 Lamb 的原始碼

=='''Format'''==
 Lamb // float

<font size=3>
The probability of a surface emitting light ray according to Lambertian cosine law. The number of photons emitted in a solid angle <math>d\Omega </math> is proportional to <math>\cos(\theta)</math>, where <math>\theta</math> is the angle between the wave vector of a light ray and the normal vector of the emission surface.
</font>

=='''Example'''==
 #Lamb
 SurfEmit
 Shell 1 
 1.00000

The probability is 100%.

=='''Math'''==

{| class="wikitable"
|-
! BSDF
! PDF
|-
| <math>\frac{1}{2\pi\cos \theta}</math>
| row 1 cell 2
|}