# \#radiance

**URL:** https://discourse.ladybug.tools/tag/radiance/7.md

[Latest](https://discourse.ladybug.tools/latest.md) · [Categories](https://discourse.ladybug.tools/categories.md) · [Tags](https://discourse.ladybug.tools/tags.md)

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## [We are Adding 5 New Daylight Compliance Recipes to Ladybug Tools](https://discourse.ladybug.tools/t/we-are-adding-5-new-daylight-compliance-recipes-to-ladybug-tools/40514)

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**Author:** [@mikkel](https://discourse.ladybug.tools/u/mikkel)\
**Replies:** 17\
**Last updated:** [November 8, 2026, 8:02am UTC](https://discourse.ladybug.tools/t/we-are-adding-5-new-daylight-compliance-recipes-to-ladybug-tools/40514 "2026-11-08T08:02:12Z")

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Hello Ladybug Tools community, As we announced earlier this year, as part of our goal of further integrating the LBT Grasshopper plugin with the needs of large professional projects, we are starting to expose new recipe…

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## ['1. Solution exception:Could not find a part of the path' for daylight simulation](https://discourse.ladybug.tools/t/1-solution-exception-could-not-find-a-part-of-the-path-for-daylight-simulation/18504)

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**Author:** [@Nimafo](https://discourse.ladybug.tools/u/Nimafo)\
**Replies:** 7\
**Last updated:** [October 1, 2026, 9:30am UTC](https://discourse.ladybug.tools/t/1-solution-exception-could-not-find-a-part-of-the-path-for-daylight-simulation/18504 "2026-10-01T09:30:04Z")

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Hi all, I get the following error on my daylight simulation. Warning: Roughness values above .2 is uncommon. Warning: Roughness values above .2 is uncommon. Runtime error (DirectoryNotFoundException): Could not find …

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## [Honeybee\_radiance cannot import luminaire](https://discourse.ladybug.tools/t/honeybee-radiance-cannot-import-luminaire/40780)

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**Author:** [@joao.pires.i](https://discourse.ladybug.tools/u/joao.pires.i)\
**Replies:** 0\
**Last updated:** [September 14, 2026, 9:46pm UTC](https://discourse.ladybug.tools/t/honeybee-radiance-cannot-import-luminaire/40780 "2026-09-14T21:46:26Z")

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Hello! I am facing a import problem after update the lbt grasshopper to 1.10.54 using the LB Versioner in GH. When I try to use a HB Luminaire it shows: cannot import luminaire from honeybee\_radiance, others components …

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## [Spatial Glare Autonomy (sGA) Calculation](https://discourse.ladybug.tools/t/spatial-glare-autonomy-sga-calculation/40672)

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**Author:** [@MahsanM](https://discourse.ladybug.tools/u/MahsanM)\
**Replies:** 1\
**Last updated:** [August 14, 2026, 10:43pm UTC](https://discourse.ladybug.tools/t/spatial-glare-autonomy-sga-calculation/40672 "2026-08-14T22:43:51Z")

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I was wondering if the posted screen captures are the correct method to calculate sGA? The default threshold is 0.4 glare and the hours include daylong, which should be fine for 95% of the time. Thanks

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## [UDI\_lower returns 0% for sensors with 0 lux all year (expected 100%)](https://discourse.ladybug.tools/t/udi-lower-returns-0-for-sensors-with-0-lux-all-year-expected-100/40659)

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**Author:** [@vall](https://discourse.ladybug.tools/u/vall)\
**Replies:** 1\
**Last updated:** [August 13, 2026, 11:52am UTC](https://discourse.ladybug.tools/t/udi-lower-returns-0-for-sensors-with-0-lux-all-year-expected-100/40659 "2026-08-13T11:52:51Z")

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Hi everyone, I’m using Honeybee LBT 1.10.0 and noticed something that I can’t explain in the Annual Daylight results. Some rooms in my model (toilets and a dressing room) receive no daylight at all. Every sensor in tho…

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## [LB Incident Radiation — "invalid literal for float(): -nan(ind)"](https://discourse.ladybug.tools/t/lb-incident-radiation-invalid-literal-for-float-nan-ind/40422)

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**Author:** [@Romer](https://discourse.ladybug.tools/u/Romer)\
**Replies:** 5\
**Last updated:** [July 16, 2026, 6:28am UTC](https://discourse.ladybug.tools/t/lb-incident-radiation-invalid-literal-for-float-nan-ind/40422 "2026-07-16T06:28:31Z")

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Hi, I’m getting the following error when running LB Incident Radiation: Solution exception: invalid literal for float(): -nan(ind) My setup: Rhino units: millimeters Geometry: Flat planar srf. What I have tri…

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## [Running HB direct sun hrs with an analysis period](https://discourse.ladybug.tools/t/running-hb-direct-sun-hrs-with-an-analysis-period/40482)

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**Author:** [@Nicholaskerr](https://discourse.ladybug.tools/u/Nicholaskerr)\
**Replies:** 3\
**Last updated:** [July 6, 2026, 9:20am UTC](https://discourse.ladybug.tools/t/running-hb-direct-sun-hrs-with-an-analysis-period/40482 "2026-07-06T09:20:40Z")

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Hi all, I am running a daylight simulation for Greenstar buildings compliance - specifically glare. To show compliance a 1.5m strip of floor around the perimeter of the floor must be shaded for 80% of nominated hrs at …

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## [Which Domain is More Suitable for Numerical and Visual Validation in Building Simulation?](https://discourse.ladybug.tools/t/which-domain-is-more-suitable-for-numerical-and-visual-validation-in-building-simulation/40177)

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**Author:** [@Zara](https://discourse.ladybug.tools/u/Zara)\
**Replies:** 1\
**Last updated:** [April 16, 2026, 2:13am UTC](https://discourse.ladybug.tools/t/which-domain-is-more-suitable-for-numerical-and-visual-validation-in-building-simulation/40177 "2026-04-16T02:13:45Z")

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Hi everyone, I am a PhD student working on integrating immersive environments with building performance simulation in architectural design. Based on recent literature, particularly a systematic review on daylight simul…

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## [Postdoctoral researcher in Building Energy Simulation, Multi-objective Optimisation and Control](https://discourse.ladybug.tools/t/postdoctoral-researcher-in-building-energy-simulation-multi-objective-optimisation-and-control/39060)

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**Author:** [@Neg](https://discourse.ladybug.tools/u/Neg)\
**Replies:** 7\
**Last updated:** [April 13, 2026, 1:24am UTC](https://discourse.ladybug.tools/t/postdoctoral-researcher-in-building-energy-simulation-multi-objective-optimisation-and-control/39060 "2026-04-13T01:24:36Z")

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Vacancy: Post-doctoral researcher (full-time) Qualifications: PhD in Building Science, Architectural Engineering, or a related field Term: 1 year, fixed term Start date: 1 October 2025 Location: Wellington or remote …

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## [Daylight Factor, sDA and Glare analysis in Honeybee – questions about results and setup](https://discourse.ladybug.tools/t/daylight-factor-sda-and-glare-analysis-in-honeybee-questions-about-results-and-setup/40156)

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**Author:** [@Lucky](https://discourse.ladybug.tools/u/Lucky)\
**Replies:** 0\
**Last updated:** [March 27, 2026, 8:06am UTC](https://discourse.ladybug.tools/t/daylight-factor-sda-and-glare-analysis-in-honeybee-questions-about-results-and-setup/40156 "2026-03-27T08:06:13Z")

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Good morning, I am developing a Grasshopper definition (Ladybug/Honeybee) for daylight analysis in a high school classroom. I am focusing on: Daylight Factor (DF / FDm)\*\* sDA (spatial Daylight Autonomy)\*\* Glare (DGP…

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## [Help Needed: Modeling Photovoltaic Components for Glare Simulation with genBSDF](https://discourse.ladybug.tools/t/help-needed-modeling-photovoltaic-components-for-glare-simulation-with-genbsdf/37115)

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**Author:** [@taytaydirect](https://discourse.ladybug.tools/u/taytaydirect)\
**Replies:** 1\
**Last updated:** [March 4, 2026, 11:57am UTC](https://discourse.ladybug.tools/t/help-needed-modeling-photovoltaic-components-for-glare-simulation-with-genbsdf/37115 "2026-03-04T11:57:51Z")

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Hi everyone, I’m currently working on generating BSDF data for a photovoltaic (PV) module using Radiance’s genBSDF, with the goal of performing glare simulations (e.g., DGP analysis). I’ve encountered some challenges sta…

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## [Feature request: multiple workers for the HDR post-process components](https://discourse.ladybug.tools/t/feature-request-multiple-workers-for-the-hdr-post-process-components/39399)

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**Author:** [@marctavenier](https://discourse.ladybug.tools/u/marctavenier)\
**Replies:** 1\
**Last updated:** [February 11, 2026, 9:29pm UTC](https://discourse.ladybug.tools/t/feature-request-multiple-workers-for-the-hdr-post-process-components/39399 "2026-02-11T21:29:40Z")

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Hi @chris, I’d like to propose the addition of multiple workers for the following HDR post-process components: They can be quite slow with multiple HDR files because they only run single core. I’ve successfully impl…

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## [Question about Surface Normal Direction in Honeybee–Radiance Integration](https://discourse.ladybug.tools/t/question-about-surface-normal-direction-in-honeybee-radiance-integration/39497)

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**Author:** [@threegreen](https://discourse.ladybug.tools/u/threegreen)\
**Replies:** 0\
**Last updated:** [November 5, 2025, 1:02pm UTC](https://discourse.ladybug.tools/t/question-about-surface-normal-direction-in-honeybee-radiance-integration/39497 "2025-11-05T13:02:16Z")

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Hello everyone! Recently, I encountered an issue related to the surface normal direction in Honeybee. As we all know, in EnergyPlus, the surface normal is oriented from the interior toward the exterior, whereas in Radia…

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## [LB Image Viewer bug report](https://discourse.ladybug.tools/t/lb-image-viewer-bug-report/39398)

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**Author:** [@marctavenier](https://discourse.ladybug.tools/u/marctavenier)\
**Replies:** 3\
**Last updated:** [October 28, 2025, 1:19pm UTC](https://discourse.ladybug.tools/t/lb-image-viewer-bug-report/39398 "2025-10-28T13:19:55Z")

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Hi @chris and @MingboPeng, I’ve encountered a bug in the LB Image Viewer where, when multiple files with the same filename that are located in a different folder are being given, the viewer only shows one of the files. …

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## [Failed to run HB Imageless Annual Glare: dcglare issue](https://discourse.ladybug.tools/t/failed-to-run-hb-imageless-annual-glare-dcglare-issue/39298)

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**Author:** [@KoBa20](https://discourse.ladybug.tools/u/KoBa20)\
**Replies:** 1\
**Last updated:** [October 8, 2025, 11:31am UTC](https://discourse.ladybug.tools/t/failed-to-run-hb-imageless-annual-glare-dcglare-issue/39298 "2025-10-08T11:31:54Z")

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Dear Ladybug-Tools-Community, while trying to run a HB Imageless Annual Glare simulation (LB version 1.9.0 installed via Pollination), I stumbled upon the following error: 2025-10-08 11:10:20 INFO: — Logging error — 2…

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## [Is it possible to include more than one base schedule for the daylight to energy workflow?](https://discourse.ladybug.tools/t/is-it-possible-to-include-more-than-one-base-schedule-for-the-daylight-to-energy-workflow/39315)

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**Author:** [@Nicholaskerr](https://discourse.ladybug.tools/u/Nicholaskerr)\
**Replies:** 0\
**Last updated:** [October 11, 2025, 3:09am UTC](https://discourse.ladybug.tools/t/is-it-possible-to-include-more-than-one-base-schedule-for-the-daylight-to-energy-workflow/39315 "2025-10-11T03:09:42Z")

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Hi all, My model has multiple rooms with different lighting schedules. I want to feed them through the daylight to energy workflow. is there a way to include multiple base schedules, one for each room included in the a…

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## [Issue Running Single-Hour Glare Analysis in Honeybee](https://discourse.ladybug.tools/t/issue-running-single-hour-glare-analysis-in-honeybee/39196)

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**Author:** [@Rahaf03](https://discourse.ladybug.tools/u/Rahaf03)\
**Replies:** 10\
**Last updated:** [September 25, 2025, 4:03pm UTC](https://discourse.ladybug.tools/t/issue-running-single-hour-glare-analysis-in-honeybee/39196 "2025-09-25T16:03:26Z")

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Hello, I am currently working on glare analysis using Honeybee, and I am facing difficulties when trying to run a single-hour glare simulation. My goal is to obtain Daylight Glare Probability (DGP) values for one spec…

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## [Dynamic Shade Groups and Scheduling States](https://discourse.ladybug.tools/t/dynamic-shade-groups-and-scheduling-states/19244)

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**Author:** [@justinfmccarty](https://discourse.ladybug.tools/u/justinfmccarty)\
**Replies:** 35\
**Last updated:** [September 23, 2025, 2:44pm UTC](https://discourse.ladybug.tools/t/dynamic-shade-groups-and-scheduling-states/19244 "2025-09-23T14:44:31Z")

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Hello! Now that dynamic shade groups are implemented 1.5.(THANK YOU!), I have a question that relates back to an older post. For context I am working on assigning different transparent materials to tree canopies based on…

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## [Inconsistent error codes & bugs with Ladybug/Honeybee/Radiance - "The system cannot find the file x or y"](https://discourse.ladybug.tools/t/inconsistent-error-codes-bugs-with-ladybug-honeybee-radiance-the-system-cannot-find-the-file-x-or-y/39157)

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**Author:** [@day1savage](https://discourse.ladybug.tools/u/day1savage)\
**Replies:** 0\
**Last updated:** [September 8, 2025, 2:05pm UTC](https://discourse.ladybug.tools/t/inconsistent-error-codes-bugs-with-ladybug-honeybee-radiance-the-system-cannot-find-the-file-x-or-y/39157 "2025-09-08T14:05:28Z")

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Hello dearest insects, I’m running into an issue I’ve never had before with Ladybug/Honeybee: I’ve been trying to run a daylight analysis. Ive done hundreds and by now have developed an intuition with what can potentia…

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## [Possible Visual Bug: All components show up as "OLD" when opening Grasshopper](https://discourse.ladybug.tools/t/possible-visual-bug-all-components-show-up-as-old-when-opening-grasshopper/39135)

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**Author:** [@Guille01](https://discourse.ladybug.tools/u/Guille01)\
**Replies:** 3\
**Last updated:** [September 5, 2025, 5:19am UTC](https://discourse.ladybug.tools/t/possible-visual-bug-all-components-show-up-as-old-when-opening-grasshopper/39135 "2025-09-05T05:19:22Z")

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Hi everyone, I’m running into a recurring issue with Ladybug/Honeybee in Grasshopper. When I open my Grasshopper file, all LB/HB components show up marked as “OLD” as if they were the legacy tools. After a few seconds,…

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## [Radiance Prism1](https://discourse.ladybug.tools/t/radiance-prism1/773)

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**Author:** [@AlessandroCorso](https://discourse.ladybug.tools/u/AlessandroCorso)\
**Replies:** 6\
**Last updated:** [August 23, 2025, 10:32am UTC](https://discourse.ladybug.tools/t/radiance-prism1/773 "2025-08-23T10:32:40Z")

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Hello, I am currently trying to understand Radiance parameters as shown in “The RADIANCE 4.2 Synthetic Imaging System”. In particular, I’m trying to understand how to recall Prism1 in HoneyBee through the Radiance Mater…

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## [How do I use the Fly component with PITView process to produce multiple views](https://discourse.ladybug.tools/t/how-do-i-use-the-fly-component-with-pitview-process-to-produce-multiple-views/37180)

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**Author:** [@MichaelDonn](https://discourse.ladybug.tools/u/MichaelDonn)\
**Replies:** 5\
**Last updated:** [August 22, 2025, 9:17am UTC](https://discourse.ladybug.tools/t/how-do-i-use-the-fly-component-with-pitview-process-to-produce-multiple-views/37180 "2025-08-22T09:17:56Z")

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I am looking to adapt the PIT View Sample file “viewbased”. I want to combine it with the Fly component to produce a series of images of design options. To test the process, I have attached 3 louvre options to the F…

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## [Window and Opaque Conduction in HB OSM](https://discourse.ladybug.tools/t/window-and-opaque-conduction-in-hb-osm/37137)

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**Author:** [@taufiqihsan18](https://discourse.ladybug.tools/u/taufiqihsan18)\
**Replies:** 0\
**Last updated:** [August 11, 2025, 6:00am UTC](https://discourse.ladybug.tools/t/window-and-opaque-conduction-in-hb-osm/37137 "2025-08-11T06:00:55Z")

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Hello everyone, I’m new in this field. My Model I run HB Model to OSM to find out the cooling load for a small part of building. In the model I add secondary facade like this with cavity depth between the exterior wall…

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## [Honeybee Annual Irradiance: Unusually Low Values Appearing Periodically by Column Without Any Shading](https://discourse.ladybug.tools/t/honeybee-annual-irradiance-unusually-low-values-appearing-periodically-by-column-without-any-shading/36807)

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**Author:** [@Joung](https://discourse.ladybug.tools/u/Joung)\
**Replies:** 4\
**Last updated:** [July 30, 2025, 5:53am UTC](https://discourse.ladybug.tools/t/honeybee-annual-irradiance-unusually-low-values-appearing-periodically-by-column-without-any-shading/36807 "2025-07-30T05:53:56Z")

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I am encountering a strange issue with the Honeybee Annual Irradiance component (version 1.8.0). My goal is to analyze how solar radiation spreads across a building facade. To do this, I created hundreds of independent …

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## [3-Phase 5-Phase Diffusive Glass](https://discourse.ladybug.tools/t/3-phase-5-phase-diffusive-glass/37046)

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**Author:** [@AlvaroG](https://discourse.ladybug.tools/u/AlvaroG)\
**Replies:** 1\
**Last updated:** [July 23, 2025, 8:38am UTC](https://discourse.ladybug.tools/t/3-phase-5-phase-diffusive-glass/37046 "2025-07-23T08:38:57Z")

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Hi, I am simulating a diffusive glass system over a greenhouse and after going through previous feedback and checking simulations, it seems Honeybee picks always a 2-phase system. As I am using BSDFs I expected it would…

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## [How to obtain daylighting simulation results in .ill format](https://discourse.ladybug.tools/t/how-to-obtain-daylighting-simulation-results-in-ill-format/37014)

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**Author:** [@Gyeong](https://discourse.ladybug.tools/u/Gyeong)\
**Replies:** 3\
**Last updated:** [July 21, 2025, 5:21am UTC](https://discourse.ladybug.tools/t/how-to-obtain-daylighting-simulation-results-in-ill-format/37014 "2025-07-21T05:21:45Z")

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Hello, I’m running a daylighting simulation in Grasshopper. I created a grid on the workplane and used the HB Annual Daylight component. Besides DA and UDI results, I’d like to export annual illuminance data (raw da…

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## [How to add a glass radiance modifier to a HB aperture created by ratio](https://discourse.ladybug.tools/t/how-to-add-a-glass-radiance-modifier-to-a-hb-aperture-created-by-ratio/24027)

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**Author:** [@deepthi.ravi](https://discourse.ladybug.tools/u/deepthi.ravi)\
**Replies:** 4\
**Last updated:** [July 9, 2025, 4:07pm UTC](https://discourse.ladybug.tools/t/how-to-add-a-glass-radiance-modifier-to-a-hb-aperture-created-by-ratio/24027 "2025-07-09T16:07:58Z")

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How do I add a HB Glass radiance modifier to a HB Aperture that is created by ratio on the solid face? Please see the screenshot attached.

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## [Set and Render in Radiance the RGB-colours to the HB\_Modifier](https://discourse.ladybug.tools/t/set-and-render-in-radiance-the-rgb-colours-to-the-hb-modifier/36734)

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**Author:** [@LaFleur](https://discourse.ladybug.tools/u/LaFleur)\
**Replies:** 1\
**Last updated:** [May 27, 2025, 4:11pm UTC](https://discourse.ladybug.tools/t/set-and-render-in-radiance-the-rgb-colours-to-the-hb-modifier/36734 "2025-05-27T16:11:35Z")

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Hallo dear Ladybuggers Is possible to add and assign a RGB color to a material and render it using Radiance and then visualize for example after a PITView simulation, via HDR? Or is only possible to set the light reflec…

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## [Multi-processor functionality in HB Radiance](https://discourse.ladybug.tools/t/multi-processor-functionality-in-hb-radiance/36575)

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**Author:** [@Soushiyant](https://discourse.ladybug.tools/u/Soushiyant)\
**Replies:** 3\
**Last updated:** [May 8, 2025, 9:25pm UTC](https://discourse.ladybug.tools/t/multi-processor-functionality-in-hb-radiance/36575 "2025-05-08T21:25:47Z")

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Hello everyone, I recently discovered that Radiance only performs simulations on Windows with a single processor. However, according to what Sarith Subramaniam mentioned here, this limitation has been addressed in Honey…

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## [Error in 5-Phase Output from Window7.8 with Ladybug Tools](https://discourse.ladybug.tools/t/error-in-5-phase-output-from-window7-8-with-ladybug-tools/36522)

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**Author:** [@Maronaa](https://discourse.ladybug.tools/u/Maronaa)\
**Replies:** 3\
**Last updated:** [April 26, 2025, 12:51pm UTC](https://discourse.ladybug.tools/t/error-in-5-phase-output-from-window7-8-with-ladybug-tools/36522 "2025-04-26T12:51:19Z")

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I’m using Window7.8 for my simulations and applied the following settings. However, when I connect the output file to Honeybee Plus for 5-Phase simulation, I get this error: Solution exception: Failed to load the re…

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