Radiance 2006 Workshop - 26 May Update

Fellow Radiance renderers, scientists, practitioners and enthusiasts (is that everybody?)

Here are some details and titles of presentations that will be given at the Radiance 2006 Scientific Workshop
13-14 (Wed-Thu) September, Queens Building, De Montfort University, Leicester, UK



Rtcontrib Tutorial
Greg Ward, Anyhere Software

The rtcontrib program introduced in Radiance 3.7 offers a general facility for tracking ray contributions and partial sums, by calling one or more rtrace processes with the -oTW or -oTV option. The intended application for rtcontrib is daylight coefficient calculations, but it may also be applied to BRDF simulation and optical systems analysis. After going over the basic idea behind rtcontrib design and operation, we will give a few related examples of daylight coefficient usage. We will then demonstrate how one can compute the light distribution from a badly designed light pipe over the course of a year using a pair of coupled rtcontrib runs, using rcalc and pcomb to render an image for each time-step. By reversing the usual ray flow direction, starting from the sky and working towards the skylight opening, we can relate the output distribution of the skylight to the sun and sky coefficients, effectively doing many photon map calculations at once. This is just to get the audience thinking about the possibilities. Plenty of time will be allowed for questions, suggestions, and discussion of user experiences and problems with the new program.

Daylight coefficients: theory and implementation
John Mardaljevic, IESD
This presentation serves as an introduction to Greg's rtcontrib tutorial.


Night Lighting Simulation: Design Evaluation Using Radiance's Rtcontrib and Mksource Programs
Jack de Valpine, Visarc Incorporated

This talk presents a lighting simulation study for the exterior lighting of a 60 story office tower set in an urban context. The purpose of the study was to assist the design team in evaluating and presenting the proposed lighting design to the owner. Due to the complexity of the design and variable design options, Radiance's rtcontrib was used to provide the greatest flexibility and control over simulation results. In order to better approximate lighting from the local surrounding urban environment and sky condition, HDRI photography was employed to capture the local environment and then used to produce an image based lighting environment with Radiance's mksource. In addition to examples from the project, overall workflow and resource requirements will be discussed in contrast to more typical workflow for Radiance simulations.


The following are titles only -- details to follow:

"WebHDR", Axel Jacobs, London Met.

“Calculation of circadian illuminance distribution with Radiance", Krzysztof Wandachowicz, Poznan University of Technology

"MOAR: The Mother of All Renderers or Radiance in Real-Time", Alan Chalmers and Kurt Debattista, Bristol University

"Comparing Real and Virtual Scenes", Timo Kunkel, Bristol University

"Radiance on Mobile Devices", Matt Aranha, Bristol University

"Accelerating Radiance using Novel Hardware", David Coulthurst, Bristol University

"New Photosphere features, e.g. panoramic HDR stitcher", Greg Ward, Anyhere Software

"Novel Applications of HDR Imaging", John Mardaljevic, IESD

More have been promised -- please send as soon as you can.

Pricing will be finalised soon. We will endeavour to keep costs as low as possible. They will be in the *region* of:

£180 Attending only
£150 Presenting
£120 Registered students
£low A special discretionary rate depending on individual circumstances, e.g. un-waged (by arrangement)


-John Mardaljevic

Dr. John Mardaljevic
Senior Research Fellow
Institute of Energy and Sustainable Development
De Montfort University
The Gateway
+44 (0) 116 257 7972
+44 (0) 116 257 7981 (fax)