Physically-Based Realistic Fire Rendering

Vincent Pegoraro, Steven G. Parker

University of Utah

Proceedings of the 2nd Eurographics Workshop on Natural Phenomena, 51-59, 2006

[paper] [slides] [bibtex]

Abstract: Accurately rendering fires is a challenging problem due to the various subtle ways in which the electromagnetic waves interact with this complex participating medium. We present a new method for physically-based rendering of flames from detailed simulations of flame dynamics which accounts for their unique characteristics. Instead of relying on ad-hoc models, we build on fundamental molecular physics to compute the spectrally dependent absorption, emission and scattering properties of the various chemical compounds found in the fire. Combined with a model of the refractive process, and with tone-mapping techniques simulating the visual adaptation of a human observer, we are able to generate highly realistic renderings of various types of flames, including colorful flames containing chemical species with very characteristic spectral properties.

Rendering of a methane pool fire simulation typically dominated by the radiation
from soot particles and rendering of a spectroscopy experiment using Sodium.

A path-traced scene where the flame is the unique source of illumination.

Modeling the adaptation of the visual system allows for a faithful reproduction
of the colors observed when looking at a flame under different lighting conditions.

Modeling of the refractive properties inducing the warping of the background brick pattern and
slight caustics on the floor near the flame envelop, and causing the straight wood stick to appear warped.

Video including figures and comments.