## Information

- Publication Type: Technical Report
- Workgroup(s)/Project(s): not specified
- Date: April 1996
- Number: TR-186-2-96-13
- Keywords: radiosity, constant radiance step

## Abstract

The proposed method accelerates the computation of
multiple interreflections in non-diffuse environments or
the solution of the rendering equation. The method is
suited for closed environments. It is a generalization of
the 'constant radiosity step' introduced for diffuse
environments and does not require geometrical or
visibility information, nor the calculation of form
factors. A constant radiance is extracted from the
solution in every surface point and every direction. We
choose this constant value so that the average self
emitted power of the residuum problem is zero. The self
emitting term of the residuum problem can either be
positive or negative. Direction dependency is determined
by the albedo function of the characteristic BRDF of the
surface. This function can easily be pretabulated and it
is used frequently throughout this paper. The residuum
problem can be solved faster or with reduced variance by
all known non-diffuse methods: different versions of
distribution ray tracing, proper methods of radiosity,
and hybrid solutions. The acceleration achieved by the
proposed method can be significant for bright environments.

## Additional Files and Images

## Weblinks

No further information available.

## BibTeX

@techreport{Neumann-1996-CRS,
title = "The Constant Radiance Term",
author = "L\'{a}szl\'{o} Neumann",
year = "1996",
abstract = "The proposed method accelerates the computation of multiple
interreflections in non-diffuse environments or the solution
of the rendering equation. The method is suited for closed
environments. It is a generalization of the 'constant
radiosity step' introduced for diffuse environments and does
not require geometrical or visibility information, nor the
calculation of form factors. A constant radiance is
extracted from the solution in every surface point and every
direction. We choose this constant value so that the average
self emitted power of the residuum problem is zero. The self
emitting term of the residuum problem can either be positive
or negative. Direction dependency is determined by the
albedo function of the characteristic BRDF of the surface.
This function can easily be pretabulated and it is used
frequently throughout this paper. The residuum problem can
be solved faster or with reduced variance by all known
non-diffuse methods: different versions of distribution ray
tracing, proper methods of radiosity, and hybrid solutions.
The acceleration achieved by the proposed
method can be significant for bright environments.",
month = apr,
number = "TR-186-2-96-13",
address = "Favoritenstrasse 9-11/E193-02, A-1040 Vienna, Austria",
institution = "Institute of Computer Graphics and Algorithms, Vienna
University of Technology ",
note = "human contact: technical-report@cg.tuwien.ac.at",
keywords = "radiosity, constant radiance step",
URL = "https://www.cg.tuwien.ac.at/research/publications/1996/Neumann-1996-CRS/",
}