Radiance Workshop Presentations, 2021 & 2022

In connection with Loisos + Ubbelohde I have twice presented at the annual International Radiance Workshop. These talks described recent work and research on daylighting and simulation, which I played a key role in.

"Building and Validating a BSDF of a Looped Metal Mesh" given with Alan DeMarche, 8/4/22 at the 20th International Radiance Workshop, Toronto, Canada [link to slide deck and audio on the Radiance website]

This presentation was given in collaboration with Alan DeMarche at Loisos + Ubbelohde, and covered the long and complex process which I, Alan, and our colleagues went through to develop a highly accurate simulation model of a fencing material that is being used as a shading material in a very large building in the Middle East. To effectively simulate this material, we had to generate a Bidirectional Scattering and Distribution Function (BSDF), which we then validated in a number of ways against samples of the actual material.

"What to Do When the Sky is Blue" given 8/19/21 at the 19th International Radiance Workshop, Bilbao, Spain

[link to slide deck and audio on the Radiance website]

"What to Do When the Sky is Blue" covered practical considerations of working with colored sky models (such as the Utah Sky) when doing daylight simulation in architecture using the physically-based rendering software Radiance. Topics covered included: choosing when to use a colored sky model; considerations for other aspects of simulation, scene, and modeling; and post processing practices for use with colored sky models such as white balancing, use of the pcond command with color primaries, and more. The presentation was illustrated with demonstration examples and practical results taken from work done by Loisos + Ubbelohde.

Building and Validating a BSDF: central concerns of studies of the metal mesh

Building and Validating a BSDF: explanation of how angular openness of BSDF was validated

Building and Validating a BSDF: example of BSDF of metal mesh as used in a Radiance simulation

What to Do When the Sky is Blue: Comparison of the different colored sky models in Radiance

What to Do When the Sky is Blue: Image explaining the reflected color of site models and reduction of the appearance of a blue cast from a colored sky model

What to Do When the Sky is Blue: Explanation of white-balancing considerations when mixing daylight sources with electric lighting sources of a different color temperature