Radiance Workshop 2023 | Program | Call for Speakers| Registration | Information

21st International Radiance Workshop
August 28-31, 2023

The Radiance Workshop is the annual user meeting of the Radiance software developer and user community. The workshop is held alternately in Europe and North America and we were pleased to welcome the Radiance community to Innsbruck this year, joining a list of prominent hosts. Check out the documentation with all recorded presentations and workshop photos from the successful event in August 2023 on the Radiance website.

Innsbruck Skyline
Source: David Geisler-Moroder

Radiance Workshop 2023
| Program | Call for Speakers | Registration | Information


(Status as of 30 August 2023)

Note: detailed venue and how-to-get-there descriptions are found under Location in the Information section

Monday, August 28: Tutorial day @ Bartenbach (here)                  

07:50     Meeting at bus station at the Adolf-Pichler-Platz in front of the Rathaus Galerien / Penz Hotel entrance (here)

08:00     Bus transfer to Bartenbach

08:30     Welcome

09:00     Tutorial 1

  • Mikkel Pedersen
    An Introduction to Ladybug Tools and Pollination for Radiance users

12:30     Lunch

13:30     Tutorial 2

  • Jan Wienold
    (Daylight) glare evaluation

16:30     Visit at Bartenbach’s World of light.

17:45     Departure

18:00     Arrival in Innsbruck at the Adolf-Pichler-Platz

Tuesday, August 29: Workshop day 1 @ University of Innsbruck (here)

08:15     Registration & Coffee (here)

08:45     Welcome

09:00     Presentations   

  • Greg Ward
    What's new in Radiance 2023
  • Zhen Tian, Yongqing Zhao
    Modified Climate-based Daylight Modeling Methods for Buildings
  • Stephen Wasilewski
    Raytraverse + Radiance: sampling scene features + ambient caching = faster high quality images
  • Sarith Subramaniam
    Adapting genBSDF for custom fenestration measurement
  • Carsten Bauer
    Radzilla 3.33

10:50     Coffee                 

11:10     Presentations

  • Marshal Maskarenj
    A new Radiance-based simulation workflow for modelling annual visual and non-visual metrics
  • Priji Balakrishnan
    Generating Location-Specific Spectral Skies for Spectral Simulations
  • Alstan Jakubiec
    Review of fritted and diffusing glass: measurement, modelling, and impact
  • John Mardaljevic
    A hybrid measurement-simulation approach to determine the daylight exposure of the Volury tapestries at Ham House

12:40     Lunch                  

13:40     Presentations

  • Justin McCarty
    High-resolution Vegetation Proxy Modeling for Partial Shading Effects on BIPV Facades
  • Valeria Piccioni
    A multiscale approach to study the thermo-optical properties of 3D-printed facades: capturing material and geometrical complexity
  • Giuseppe De Michele, Joseph Roberts
    Modelling and simulation of PDLC glazing in Radiance
  • Janina Willmann
    Simulating Patterned (Photovoltaic) Glass with Data-Driven Variable-Resolution BRDFs
  • Nima Forouzandeh
    Influence of inaccurate material optical properties and geometrical levels of detail on daylight simulation results - sensitivity analysis and uncertainty quantification

15:30     Coffee                 

15:50     Presentations   

  • Jon Sargent
    Multiversal Ray Tracing (a.k.a. Everything everywhere now and for the whole year)
  • Jan Wienold
    The "forgotten" influence of atmospheric humidity on sky modeling with gendaylit
  • Lars Grobe
    Climate-based daylight modeling, metrics and level of detail
  • Martin Hauer
    Introduction to the Unit of Energy Efficient Building (EEB) at the Univerity of Innsbruck: Overview, Lab Infrastructure, and the MEZeroE project

17:15     Closing

17:30     Optional guided tour of the UIBK EEB lab by Martin Hauer (on the way to the bus/tram stop)


19:30     Workshop Dinner (in the Innsbruck city center, here)

Wednesday, August 30: Workshop day 2 @ University of Innsbruck (here)

08:15     Coffee                 

08:45     Presentations   

  • Yunni Cho
    Tone-Mapping Requirements in Real-Time Videos for Studying the Dynamism of Views-Out in Virtual Reality
  • Sietse de Vries
    Simulating dappled light patterns for VR research with Radiance
  • Kazunori Yanagawa, Tomoyuki Akaho
    Observation method of photon flow using virtual reality headsets - Application to architectural light environment design
  • Ömercan Yazici
    Using Radiance as a baseline for interactive glare risk assessment on the GPU
  • Christian Knoflach
    Small glare sources in the periphery of the field of vision

10:35     Coffee                 

10:55     Presentations

  • Zhe Kong
    Visual and Non-visual Impacts of Commercial Self-luminous Signboards in Residential Areas in China
  • Margarita Alwalidi
    The effect of multichannel spectral simulation on the evaluation of lighting energy demand in an office room
  • John Mardaljevic, Lukas Prost
    Validation of VELUX Daylight Visualizer CBDM Predictions Against Radiance
  • David Geisler-Moroder, Lukas Prost
    Validation of DVIZ simulations with BSDFs against Radiance

12:30     Lunch                  

13:30     Presentations

  • Ingrid Demanega
    Coupling Radiance and Computational Fluid Dynamic simulation for a detailed characterization of façades with integrated shading device
  • Miriam Nader Elias
    Evaluating the Effectiveness of Four-Sided Wind Towers for Daylighting: Parametric Daylight Performance & Optimization Study of a Complex Fenestration System Using Radiance
  • Daniel Plörer
    Daylight Glare Probability and Façade Openness Analysis of moveable Blind Systems using Raytraverse
  • Christian Knoflach
    The workflow challenges in daylighting calculations with RADIANCE for huge architectural structures

15:00     Coffee                 

15:25    Presentations   

  • Francesco Anselmo
    Designing the Full Moon Theatre
  • Rob Shakespeare
    Designing Visually Accessible Spaces
  • Andreas Noback
    phos4dtools: Reconstructing the daylight conditions in an insula of antique Pompeii

16:30     Radiance refactoring

  • Greg Ward
    Update on refactoring progress
  • All

17:45     Closing

Thursday, August 31: Excursion: HELLA factory tour in the region of Osttirol

07:50     Meeting at the bus station at Hofgarten (here)

08:00     Transfer to HELLA

10:45     Arrival and welcome by André Kraler in Abfaltersbach

11:00     HELLA factory tour

12:30     Keynote Robert Weitlaner: “Radiance at HELLA”

13:00     Lunch

14:00     Departure to Heinfels

14:30     Guided tour at Castle Heinfels

15:30     Coffee & cake

16:00     Return to Innsbruck

19:00     Arrival in Innsbruck at the Hofgarten bus station

Radiance Workshop 2023
| Program | Call for Speakers | Registration | Information

Call for Speakers

Greg is looking for speakers in Innsbruck…

Greg Ward searching for speakers
Source: David Geisler-Moroder


Submission closed June 15, 2023.

The workshop is an optimal platform for researchers, practitioners, educators and all other daylight, HDR, rendering, and lighting simulation lovers to present and discuss their Radiance-related work. It does not matter whether you are a complete newbie, an experienced user or an expert – all contributions are welcome. Speakers not only have the possibility to discuss their results and ongoing work with experts and get valuable feedback from the community, but also receive a discount on the workshop registration.

Presentations at the workshop will be 15 minutes + 5 minutes for Q&A. After the workshop the presentations will be made available on the Radiance website.



Radiance Workshop 2023 | Program | Call for Speakers | Registration | Information


Jump on and be there!

David Geisler-Moroder jumping on another level
Source: Greg Ward

Registration closed, 31 Juli.
(In case of emergency, send a message to radianceworkshop2023@uibk.ac.at)

Thanks to our generous sponsors, we are able to keep the conference fees low and additionally offer a free factory tour at HELLA and an excursion to a scenic area.

Packages & Fees

Tutorial Day (August 28) & 2-Day Workshop (August 29-30)

  • Attendee                    € 400
  • Speaker                      € 300
  • Student                       € 150

Tutorial Day Only (August 28)

  • Attendee                     € 150
  • Student                       € 75

2-Day Workshop only (August 29-30)

  • Attendee                     € 300
  • Speaker                       € 200
  • Student                       € 100
  • Online Attendance    € 100

HELLA factory tour and excursion (August 31)

  • Attendee                     FREE (extra registration required!)

Registration closed, 31 July.

If you have any question about the regristration process don't hesitate to send an email to


We are looking forward to welcoming you in Innsbruck!

Welcome to the Radiance Workshop 2023
Source: David Geisler-Moroder


Radiance Workshop 2023 | Program | Call for Speakers | Registration | Information



The Radiance Workshop 2023 will take place from 28 to 31 August:

  • August 28           Tutorial day
  • August 29 & 30  Workshop days
  • August 31           HELLA factory tour and excursion with a short hike

Welcome to the Radiance Workshop 2023
Source: David Geisler-Moroder


August 28: Tutorial Day @ Bartenbach

Bartenbach GmbH is located at Aldrans (Address: Rinner Straße 14, 6071 Aldrans), nearby Innsbruck. A shuttle bus is organized to take all participants from the city centre to Aldrans in the morning and back after the workshop has ended at the end of the day. If anyone plans to come directly to Aldrans, please let the organisational team know, so we don't have to wait with the bus.

The pick-up and drop-off location and times of the shuttle bus are:

  • Departure location: in front of the Rathaus Galerien / Penz Hotel entrance at the Adolf-Pichler-Platz (here)
  • Departure time: 7:50 a.m.
  • Arrival time after the workshop: ca. 18:00 p.m.
Bus departure location Adolf-Pichler-Platz
Bus departure location in front of the Rathaus Galerien / Penz Hotel entrance at the Adolf-Pichler-Platz

August 29 & 30: Workshop day 1 & 2 @ University of Innsbruck, Campus Technik:

Seminar room ("Seminarraum") nr. 1 and 2 at the ground floor ("EG" or "Erdgeschoss") of the ICT-Building ("ICT-Gebäude") at the Campus Technik (which is located in the west of Innsbruck). This building i.a. hosts the Informatics department of the University of Innsbruck, which offers a good description on how to arrive at the ICT-Building from the city on their website. This includes the public transport possibilies from the city centre to the Campus Technik, mainly practical are the following two trams that generally depart every ten minutes (online timetable for Innsbruck can be found at: www.ivb.at):

Coming from the main train station:

  • Tram 5 (Technik West) takes you directly to Innsbruck Technik (17min / 9 stops)

Coming from the historic center:

  • Tram 2 (Peerhofsiedlung or Technik West) takes you directly to Innsbruck Technik (about 13min)

The address of the ICT-Building is:

Technikerstraße 21a
A - 6020 Innsbruck

In the picture below, the bigger building in the middle/left is the Engineering Sciences Building; here the hosting unit (Unit of Energy Efficient Building) is located; however, the Workshop Days take place at the ground floor of the ICT-Building, which is the smaller four-story building at the right side.

UIBK Campus Technik - Engineering Sciences Building
Source: Universität Innsbruck/Birgit Pichler

August 31: HELLA Factory tour and visit to the region of Ost-Tirol

HELLA is located at Abfaltersbach, in the region of Ost-Tirol. A shuttle bus is organized to take all participants from the city centre to HELLA in the morning and back after the visit to Ost-Tirol has ended at the end of the day. The pick-up and drop-off location and times are:


In Innsbruck there are numerous accommodations in all price ranges that you can book via Booking, Airbnb, or similar platforms.

With some hotels you get special conditions through the University of Innsbruck, subject to availability:

  • Hotel Mondschein
    Use the code “promo23” when booking on their website to receive a 10% discount on the daily rates.

  • Basic Hotel Innsbruck
    Use the code “Radiance” when booking on their website to receive a special rate.

  • Hotel Innsbruck
    When booking, inform them that you are coming for the Radiance Workshop at the University of Innsbruck to receive a special rate.

  • Hotel Neue Post
    When booking, inform them that you are coming for the Radiance Workshop at the University of Innsbruck to receive a special rate.

  • Meininger Hotels
    Use the code “CORP2023” when booking on their website to receive a 10% discount.

Cooperation partners:

We gratefully acknowledge the generous sponsorship by

HELLA      Bartenbach GmbH  Zumtobel

The workshop is further made possible through our international cooperation in the IEA SHC Task 70 “Low Carbon, High Comfort Integrated Lighting”, nationally supported by the Federal Ministry for Climate Action, Environment, Energy, Mobility, Innovation and Technology (BMK) and the Austrian Research Promotion Agency (FFG).

FFG en    BMK en    IEA Cooperation en


Send any questions or comments to radianceworkshop2023@uibk.ac.at or to David Geisler-Moroder.

Hosting Unit:
Unit for Energy Efficient Building of the University of Innsbruck
Technikerstraße 13, 5th Floor - South, 6020 Innsbruck, Austria

Radiance Workshop 2023 | Program | Call for Speakers | Registration | Information

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