Lecture 12: Monte Carlo Integration
Lecture 12:
Monte Carlo Integration
Computer Graphics and Imaging UC Berkeley CS184/284A
Reminder: Quadrature-Based Numerical Integration
f (x)
Zb f (x)dx = F (b) F (a)
a
x0 = a
x1 x1x2 xx12x3 xx23 x3
x4 = b
E.g. trapezoidal rule - estimate integral assuming function is piecewise linear
CS184/284A
Ren Ng
Multi-Dimensional Integrals (Rendering Examples)
2D Integral: Recall Antialiasing By Area Sampling
Point sampling
Area sampling
CS184/284A
Integrate over 2D area of pixel
Ren Ng
2D Integral: Irradiance from the Environment
Computing flux per unit area on surface, due to incoming
light froZm all directions.
E(p) = Li(p, !) cos d!
H2
Contribution to irradiance from light arriving
from direction !
Hemisphere: H2
d!
Light meter
CS184/284A
dA
Ren Ng
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