Depicting the 4 participating media phenomena: emission, absorption, out-scattering, and in-scattering

Representation of the elements affecting the integral transport equation

Two phase functions: anisotropic and hazy approximation

Solving the intensities in a simple scene containing a participating medium

Cloud tests using anisotropic (left) and anisotropic (right) phase functions

Scheme depicting how radiant intensities are hierarchically pushed (for clusters)

Using directional distributions to represent absorption coefficients in clusters

A second example, showing the boundaries of some clusters

Irradiance gathered using a Monte Carlo approach in the SIR rendering architecture

Radiances of this simple scene using linear local density estimation