Radiance and HDR workshop 2025

 

August 27-29, Lausanne, Switzerland 

The Radiance Workshop is the annual meeting of the Radiance software community, alternating between Europe and North America. This year’s event will take place in Lausanne, Switzerland, and will include a special HDR workshop on the third day, organized by the HiDyn project consortium.

The workshop brings together researchers, practitioners, educators, and enthusiasts in daylighting, rendering, and lighting simulation to present and discuss their Radiance-related work. Whether you’re new to the software or an experienced user, all contributions are welcome. Speakers benefit from in-depth discussions, valuable feedback, and a discounted registration fee.

This year’s program will also feature a dedicated afternoon focused on material modelling—a core topic in almost all Radiance workflows. Contributions related to material characterization, modeling techniques, or case studies are especially encouraged for this session.

The third day will be devoted to a hands-on HDR workshop. Experienced users can present their work and refine HDR imaging workflows. For beginners, the session offers a guided introduction to HDR imaging—covering core principles, image generation, and practical camera calibration techniques—providing a strong foundation in state-of-the-art methods.

Tentative program for the Radiance Workshop (will be updated continuously)

Wednesday, August 27^th

Location: EPFL Campus, Room BC420

08:45	Arrival and Coffee
09:00	Welcome	Jan Wienold
09:10	What’s new with Radiance	Greg Ward, Taoning Wang
09:55	Modeling and simulation of radiation in modern urban spaces	Rafael Bartsch
10:25	Optimizing PV Cell Layouts on Sunshading lamellas under Realistic Shadow Scenarios Using Radiance-Based Simulation Workflows	Stephan Moser
10:55	Coffee-Break
11:15	Comparing the performance of electrochromic glazing and fabric roller blinds under automated and manual control schemes in office buildings	Mojdeh Sabeti
11:45	Window view clarity and glare in perforated shading systems: a user assessment	Xuran Guo
12:15	The Effect of Biophilic Glare Control on Occupant Perception	Eleni Mousteri
12:45	Lunch
14:00	The Zero Carbon Building Systems lab in daylight research at ETH Zurich	Lars Grobe
14:30	Reference models for spectral simulations and annual simulation of circadian light exposure	David Geisler-Moroder, Greg Ward and Taoning Wang
15:15	Coffee-Break
15:35	The incidence operator method, its parametric design integration and application to predict daylight quantities	Simon Weber
16:05	Differentiable daylight simulations using Mitsuba	Wenzel Jakob, Mattéo Santini
16:35	Lab visits (RGL- goniophotometer, LIPID-mystery of daylight, LIPID-glare simulator)
17:45	End of workshop day 1
19:30	Dinner

Thursday, August 28^th

Location: EPFL Campus, Room BC420

08:45	Arrival and Coffee
09:00	Applying DeVAS tools: Low Vision Facial Recognition, EVA new research initiative	Rob Shakespeare
09:45	Processing Geodetic Geometry with RADIANCE	Peter Apian-Bennewitz
10:05	Updates from the full moon theater	Francesco Anselmo
10:35	On the way to an ISO/CIE standard for BSDF data generation for complex fenestration systems	David Geisler-Moroder
11:05	Dealing with Lens Flare in Captured HDR Images with Electric Light Sources for Glare Metric Calculations Using Evalglare	Beatrice Yuen
11:30	Coffee-break
12:00	The Devil is in the Details: Challenges and Solutions for Monitoring Daylight in Existing Buildings	Eleonora Brembilla
12:30	Simulations for the EN17037: Differences between climate-based and DF method	Jan Wienold
13:00	Lunch
14:00	Photon Flow with Direction and Colour – Supporting Lighting Design of Exhibition Spaces Enveloped in Diffuse Light –	Roland Schregle
14:35	Material-Session I: Materials in RADIANCE	Peter Apian-Bennewitz
15:35	Coffee-Break
16:00	Material-Session 2: WGMDfunc Material Primitive	Greg Ward
16:30	Lab Visit LIPID
17:30	RADIANCE workshop end

   

Tentative program for the HDR Workshop (will be updated continuously)

Friday, August 29^th 

Location: EPFL Campus, Room BC420

08:45	Arrival and Coffee
09:00	Welcome	Jan Wienold
09:05	A Brief History of High Dynamic Range Imaging	Greg Ward
09:50	Overview of the Joint Research Project HiDyn	Johannes Ledig
10:05	Overview of LDR image merging algorithms	Lou Gevaux
10:25	Design of a high-contrast reference light source	Johannes Ledig/Constantinos Bouroussis
10:35	Characterization of imaging devices using reference light sources	Johannes Ledig/Constantinos Bouroussis
10:55	Example results from HDR-characterization using a reference light source	Johannes Ledig/Constantinos Bouroussis
11:10	Coffee-break
11:30	Current challenges for reliable HDR imaging for glare assessment	Constantinos Bouroussis
12:00	Commonly used software to generate HDRs and pitfalls	Dong Kim
12:30	Lunch, Change location to room LE010
13:30	Hands-on/ introduction/ live-demo of  self-calibrating a HDR camera Example characterization using a high-contrast reference light source	Dong Kim
15:00	Coffee-break
15:20	Hands-on/ introduction/ live-demo of  self-calibrating a HDR camera Example characterization using a high-contrast reference light source	Dong Kim
17:00	End of Workshop

Register here

Call for Speakers
We invite you to contribute for both the Radiance Workshop and the HDR Workshop. If you would like to present your work, please submit a title and a short abstract (maximum 250 words) to the following email address by August 12th, 2025 (early submissions are highly appreciated):
[email protected]

Whether your topic relates to daylighting, rendering, material modelling, HDR imaging, or any other Radiance-related area, we look forward to your proposal!

We are pleased to offer low fees:

We look forward to welcoming you in August!

Register here