# ladybug-tools

**URL:** https://discourse.ladybug.tools/c/ladybug-tools/27.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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## [About the ladybug-tools category](https://discourse.ladybug.tools/t/about-the-ladybug-tools-category/2109)

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**Author:** [@admin](https://discourse.ladybug.tools/u/admin)\
**Replies:** 0\
**Last updated:** [September 22, 2017, 4:14pm UTC](https://discourse.ladybug.tools/t/about-the-ladybug-tools-category/2109 "2017-09-22T16:14:14Z")

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Use idea category for topics that are about new thoughts and ideas which is not a #feature. All the discussions related to operating systems, overall discussions about the plugins or the community should be tagged as #la…

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## [Outdoor comfort under a tree](https://discourse.ladybug.tools/t/outdoor-comfort-under-a-tree/40909)

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**Author:** [@ec](https://discourse.ladybug.tools/u/ec)\
**Replies:** 4\
**Last updated:** [November 7, 2026, 10:21pm UTC](https://discourse.ladybug.tools/t/outdoor-comfort-under-a-tree/40909 "2026-11-07T22:21:22Z")

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Hello, I would like to investigate the changes in thermal stress around buildings with and without trees using the ready-made Grasshopper (.gh) file called “Outdoor Comfort Under a Tree.” However, the areas where trees…

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## [Publishing Interactive Web Dashboards for Honeybee Energy / Daylight Reports with Fast LCP & WCAG 2.2 Compliance](https://discourse.ladybug.tools/t/publishing-interactive-web-dashboards-for-honeybee-energy-daylight-reports-with-fast-lcp-wcag-2-2-compliance/40908)

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**Author:** [@cadguide](https://discourse.ladybug.tools/u/cadguide)\
**Replies:** 0\
**Last updated:** [November 6, 2026, 5:20am UTC](https://discourse.ladybug.tools/t/publishing-interactive-web-dashboards-for-honeybee-energy-daylight-reports-with-fast-lcp-wcag-2-2-compliance/40908 "2026-11-06T05:20:20Z")

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When architectural engineering and sustainability teams export Ladybug / Honeybee annual daylight (UDI / sDA) and EnergyPlus thermal comfort matrices into interactive web dashboards for client delivery or municipal permi…

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## [HB Model to OSM fails on sample files: OS\_PortList BOOST\_ASSERT (LBT 1.10 / OpenStudio 3.10)](https://discourse.ladybug.tools/t/hb-model-to-osm-fails-on-sample-files-os-portlist-boost-assert-lbt-1-10-openstudio-3-10/40898)

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**Author:** [@tru](https://discourse.ladybug.tools/u/tru)\
**Replies:** 1\
**Last updated:** [November 3, 2026, 8:48am UTC](https://discourse.ladybug.tools/t/hb-model-to-osm-fails-on-sample-files-os-portlist-boost-assert-lbt-1-10-openstudio-3-10/40898 "2026-11-03T08:48:16Z")

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Hi I am getting this error with my Openstudio running the sample definition. Anyone could help to identify the problem? Thanks in advance Error message: \[BOOST\_ASSERT\] \<2\> Assertion oObj failed on line 33164 of auto …

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## [Rhino 9 for Mac compatibility with Ladybug/Honeybee on Apple M5 Pro](https://discourse.ladybug.tools/t/rhino-9-for-mac-compatibility-with-ladybug-honeybee-on-apple-m5-pro/40899)

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**Author:** [@maha](https://discourse.ladybug.tools/u/maha)\
**Replies:** 0\
**Last updated:** [November 3, 2026, 12:24am UTC](https://discourse.ladybug.tools/t/rhino-9-for-mac-compatibility-with-ladybug-honeybee-on-apple-m5-pro/40899 "2026-11-03T00:24:19Z")

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Hello, I am starting a daylight study and have not installed or purchased Rhino yet. My computer is an Apple M5 Pro Mac with 64 GB memory, and macOS Tahoe 26.5.2. Rhino’s download page offers Rhino 9, but the Ladybug …

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## [HB Blend ProgramTypes produces inconsistent schedules](https://discourse.ladybug.tools/t/hb-blend-programtypes-produces-inconsistent-schedules/40885)

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**Author:** [@gzorzeto](https://discourse.ladybug.tools/u/gzorzeto)\
**Replies:** 0\
**Last updated:** [October 29, 2026, 5:07pm UTC](https://discourse.ladybug.tools/t/hb-blend-programtypes-produces-inconsistent-schedules/40885 "2026-10-29T17:07:31Z")

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Hi everyone, I’ve been comparing multi vs single-zone models, and I might have spotted a problem with the HB Blend ProgarmTypes component. I think the averaging method works fine for the design load capacities, but fail…

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## [HB Subface Subset dose not work for windows](https://discourse.ladybug.tools/t/hb-subface-subset-dose-not-work-for-windows/40813)

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**Author:** [@Aliarch](https://discourse.ladybug.tools/u/Aliarch)\
**Replies:** 2\
**Last updated:** [October 28, 2026, 8:11am UTC](https://discourse.ladybug.tools/t/hb-subface-subset-dose-not-work-for-windows/40813 "2026-10-28T08:11:11Z")

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Hi @chris changing the materials of window by HB subset through HB Const Set is not possible. However i can change them by HB apply window constr only.

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## [HB PMV Comfort Map 1.10.0 fails at CreateIrradianceContribMap with \_collection\_type / collectiontype error](https://discourse.ladybug.tools/t/hb-pmv-comfort-map-1-10-0-fails-at-createirradiancecontribmap-with-collection-type-collectiontype-error/40520)

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**Author:** [@changf](https://discourse.ladybug.tools/u/changf)\
**Replies:** 7\
**Last updated:** [October 26, 2026, 2:12pm UTC](https://discourse.ladybug.tools/t/hb-pmv-comfort-map-1-10-0-fails-at-createirradiancecontribmap-with-collection-type-collectiontype-error/40520 "2026-10-26T14:12:31Z")

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Hi everyone, I was running HB PMV Comfort Map 1.7.0 without problems but since I updated to version 1.10.0, I got a repeated failure in CreateIrradianceContribMap. The recipe failed with: AttributeError: 'str' object …

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## [Dynamic shade with states for EnergyPlus simulation](https://discourse.ladybug.tools/t/dynamic-shade-with-states-for-energyplus-simulation/23941)

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**Author:** [@ChrsitianDegn](https://discourse.ladybug.tools/u/ChrsitianDegn)\
**Replies:** 6\
**Last updated:** [October 22, 2026, 8:14am UTC](https://discourse.ladybug.tools/t/dynamic-shade-with-states-for-energyplus-simulation/23941 "2026-10-22T08:14:18Z")

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Hello, Is there a way to run an EnergyPlus simulation with dynamic shade groups controlled with states and a schedule similar to how Radiance daylight simulations work now? In practice, I would like to run an EnergyPlu…

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## [Rosetta 2 for ladybug on Mac?](https://discourse.ladybug.tools/t/rosetta-2-for-ladybug-on-mac/40852)

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**Author:** [@Murray1111](https://discourse.ladybug.tools/u/Murray1111)\
**Replies:** 4\
**Last updated:** [October 20, 2026, 7:32pm UTC](https://discourse.ladybug.tools/t/rosetta-2-for-ladybug-on-mac/40852 "2026-10-20T19:32:57Z")

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Hi all, Quick rather simplistic question, is Rosetta 2 required to install ladybug on a Mac? The installer in grasshopper says it is… For context I am using rhino 8 and trying to install LB 1.10.0 Thanks in advance.

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## [HB Internal Walls](https://discourse.ladybug.tools/t/hb-internal-walls/40855)

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**Author:** [@asezel](https://discourse.ladybug.tools/u/asezel)\
**Replies:** 0\
**Last updated:** [October 14, 2026, 10:18am UTC](https://discourse.ladybug.tools/t/hb-internal-walls/40855 "2026-10-14T10:18:56Z")

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Hello, In a floor level simulation, is it possible to add internal walls without adding new zones? I want to basically have 1 volume for the floor and add internal walls without creating a zone for every room. I’d very…

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## [No module named honeybee\_radiance.config](https://discourse.ladybug.tools/t/no-module-named-honeybee-radiance-config/40846)

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**Author:** [@dumpling](https://discourse.ladybug.tools/u/dumpling)\
**Replies:** 0\
**Last updated:** [October 11, 2026, 10:40pm UTC](https://discourse.ladybug.tools/t/no-module-named-honeybee-radiance-config/40846 "2026-10-11T22:40:04Z")

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Does anyone know how to find / where I can install honeybee\_radiance.config? Thanks!

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## [Ladybug Installation Mac M5](https://discourse.ladybug.tools/t/ladybug-installation-mac-m5/40845)

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**Author:** [@Murray1111](https://discourse.ladybug.tools/u/Murray1111)\
**Replies:** 0\
**Last updated:** [October 11, 2026, 7:11pm UTC](https://discourse.ladybug.tools/t/ladybug-installation-mac-m5/40845 "2026-10-11T19:11:55Z")

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Hi all, Quick rather simplistic question, is rosetta required to install ladybug on a Mac? The installer in grasshopper says it is… For context I am using rhino 8 and trying to install LB 1.10.0 Thanks in advance.

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## [Ladybug tools fails to load in Rhino InsideRevit](https://discourse.ladybug.tools/t/ladybug-tools-fails-to-load-in-rhino-insiderevit/40839)

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**Author:** [@Asisnath](https://discourse.ladybug.tools/u/Asisnath)\
**Replies:** 3\
**Last updated:** [October 10, 2026, 6:09pm UTC](https://discourse.ladybug.tools/t/ladybug-tools-fails-to-load-in-rhino-insiderevit/40839 "2026-10-10T18:09:56Z")

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Hello all! When I used Revit and open Rhino using RIR and then open Ladybug tools this issue arises. Ladybug tools not loading in RIR. everthing works well when opened Rhino as stand alone. Already tried reinstalling. I …

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## [Ladybug 1.10 is not loading in Rhino 8](https://discourse.ladybug.tools/t/ladybug-1-10-is-not-loading-in-rhino-8/40807)

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**Author:** [@Doris](https://discourse.ladybug.tools/u/Doris)\
**Replies:** 7\
**Last updated:** [October 2, 2026, 10:21pm UTC](https://discourse.ladybug.tools/t/ladybug-1-10-is-not-loading-in-rhino-8/40807 "2026-10-02T22:21:30Z")

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Hi @chris I hope you are going well. I am writing to ask for your help, please. I have installed Ladybug version 1.10 through Pollination for Grasshopper (plugins\_release\_PollinationGHInstaller-1.71.1.exe). However, whe…

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## [I cannot use LBT with my Rhino educator license](https://discourse.ladybug.tools/t/i-cannot-use-lbt-with-my-rhino-educator-license/40809)

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**Author:** [@PatriciaEdithCampore](https://discourse.ladybug.tools/u/PatriciaEdithCampore)\
**Replies:** 1\
**Last updated:** [September 27, 2026, 12:28am UTC](https://discourse.ladybug.tools/t/i-cannot-use-lbt-with-my-rhino-educator-license/40809 "2026-09-27T00:28:01Z")

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After the last Rhino update, I opened it and LBT tools had disappeared. I reinstallled LBT tools from food4 Rhino. In the command bar appeared this legend: LBT Plugin: C:\\Program Files\\ladybug\_tools\\python\\Lib\\site-pack…

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## [The illuminance calculation of electric light is not correct](https://discourse.ladybug.tools/t/the-illuminance-calculation-of-electric-light-is-not-correct/40799)

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**Author:** [@mrbass](https://discourse.ladybug.tools/u/mrbass)\
**Replies:** 2\
**Last updated:** [September 23, 2026, 7:51am UTC](https://discourse.ladybug.tools/t/the-illuminance-calculation-of-electric-light-is-not-correct/40799 "2026-09-23T07:51:44Z")

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i followed the sample of electric light, but the result seems wrong when I check the illuminance in DIAlux. Did anybody know how to fix this?

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## [Ironbug component does not turn red with invalid empty plant branch, fatal EnergyPlus error "Missing required property 'component\_name'"](https://discourse.ladybug.tools/t/ironbug-component-does-not-turn-red-with-invalid-empty-plant-branch-fatal-energyplus-error-missing-required-property-component-name/40795)

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**Author:** [@cpc](https://discourse.ladybug.tools/u/cpc)\
**Replies:** 1\
**Last updated:** [September 20, 2026, 1:20pm UTC](https://discourse.ladybug.tools/t/ironbug-component-does-not-turn-red-with-invalid-empty-plant-branch-fatal-energyplus-error-missing-required-property-component-name/40795 "2026-09-20T13:20:03Z")

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Hello everyone, hope you’re doing well. I’m building HVAC systems with Ironbug + Honeybee 1.8.0 in Grasshopper. Problem 1: Ironbug components do NOT show red/orange warning colour on canvas even when the generated plant…

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## [Bug of DumpVisSet? Or incomplete known issues](https://discourse.ladybug.tools/t/bug-of-dumpvisset-or-incomplete-known-issues/39972)

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**Author:** [@ZhengrongTao](https://discourse.ladybug.tools/u/ZhengrongTao)\
**Replies:** 13\
**Last updated:** [September 18, 2026, 4:57pm UTC](https://discourse.ladybug.tools/t/bug-of-dumpvisset-or-incomplete-known-issues/39972 "2026-09-18T16:57:06Z")

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hi,@chris I am attempting to use the DumpVisSet component to export the SVG image. Its application in the flat or three-dimensional images provided by Ladybug has been very successful. However, when I used the Visualiza…

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## [Is this a bug in the source code for Calculating DHI?](https://discourse.ladybug.tools/t/is-this-a-bug-in-the-source-code-for-calculating-dhi/40750)

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**Author:** [@cdwu](https://discourse.ladybug.tools/u/cdwu)\
**Replies:** 4\
**Last updated:** [September 16, 2026, 2:19pm UTC](https://discourse.ladybug.tools/t/is-this-a-bug-in-the-source-code-for-calculating-dhi/40750 "2026-09-16T14:19:35Z")

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Hi Mostapha and Chris, While I was working on a research project using the “direct solar irradiance” component in Ladybug, I realized that the equation used to calculate diffuse irradiance for anisotropic sky is (0.313 \*…

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## [Custom EPW file import in Ladybug Grasshopper from PC folder](https://discourse.ladybug.tools/t/custom-epw-file-import-in-ladybug-grasshopper-from-pc-folder/23663)

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**Author:** [@Anastasiia](https://discourse.ladybug.tools/u/Anastasiia)\
**Replies:** 8\
**Last updated:** [September 16, 2026, 10:17am UTC](https://discourse.ladybug.tools/t/custom-epw-file-import-in-ladybug-grasshopper-from-pc-folder/23663 "2026-09-16T10:17:36Z")

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Hello! I am surviving some kind of a crisis here:) The aim of my research is to compare the two summer temperature scenarios (the current situation VS the R.C.P. 4.5 projection to the 2050). I managed to successfully mo…

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## [DownloadEPW component not reading file path EPW files](https://discourse.ladybug.tools/t/downloadepw-component-not-reading-file-path-epw-files/40784)

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**Author:** [@Rob](https://discourse.ladybug.tools/u/Rob)\
**Replies:** 4\
**Last updated:** [September 15, 2026, 1:00pm UTC](https://discourse.ladybug.tools/t/downloadepw-component-not-reading-file-path-epw-files/40784 "2026-09-15T13:00:25Z")

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The DownloadEPW comes up with an error (below) when trying to use a saved weather file via a file path: Input parameter \_weather\_URL failed to collect data! It seems to keep looking for a web source EPW rather than th…

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## [Daylight is not transported through a horizontal reflective light pipe in a Point-in-Time Grid study](https://discourse.ladybug.tools/t/daylight-is-not-transported-through-a-horizontal-reflective-light-pipe-in-a-point-in-time-grid-study/40593)

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**Author:** [@fatalay](https://discourse.ladybug.tools/u/fatalay)\
**Replies:** 1\
**Last updated:** [September 13, 2026, 8:42pm UTC](https://discourse.ladybug.tools/t/daylight-is-not-transported-through-a-horizontal-reflective-light-pipe-in-a-point-in-time-grid-study/40593 "2026-09-13T20:42:27Z")

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Hello, I am trying to model a horizontal light pipe entering through the façade using Grasshopper–Honeybee. The internal surface of the pipe is intended to have 99% reflectance, while the exterior collector and interior…

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## [Mac Ladybug Installation Hanging](https://discourse.ladybug.tools/t/mac-ladybug-installation-hanging/40759)

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**Author:** [@ps3ratt](https://discourse.ladybug.tools/u/ps3ratt)\
**Replies:** 2\
**Last updated:** [September 11, 2026, 6:08am UTC](https://discourse.ladybug.tools/t/mac-ladybug-installation-hanging/40759 "2026-09-11T06:08:41Z")

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I am trying to install LBT 1.10.0 for Rhino 8 on my Macbook M3 Pro however no matter what I try it gets stuck with the spinning wheel on step 2 of the installer .gh file. I have tried installing older versions of LBT, a…

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## [Pollinator install problem loading errors](https://discourse.ladybug.tools/t/pollinator-install-problem-loading-errors/40749)

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**Author:** [@Alakelele](https://discourse.ladybug.tools/u/Alakelele)\
**Replies:** 1\
**Last updated:** [September 8, 2026, 3:52pm UTC](https://discourse.ladybug.tools/t/pollinator-install-problem-loading-errors/40749 "2026-09-08T15:52:04Z")

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Hello there, notification at grasshopper start, Rhino 8 windows 11, everything fresh install and last stable version as of 2 days. Priority: CategoryIcon { Call PollinationLogger.LogHelper.OneTimeSetup(ILoggerFactory …

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## [Ladybug/Honeybee on Mac](https://discourse.ladybug.tools/t/ladybug-honeybee-on-mac/40756)

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**Author:** [@Murray1111](https://discourse.ladybug.tools/u/Murray1111)\
**Replies:** 3\
**Last updated:** [September 7, 2026, 2:55pm UTC](https://discourse.ladybug.tools/t/ladybug-honeybee-on-mac/40756 "2026-09-07T14:55:24Z")

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Hi all, new here so hope this is the relevant section to ask, I am a Architecture student hoping to start using Ladybug and honeybee plugins with Rhino, my question is how does this run on Mac? Is a MacBook a viable opti…

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## [FAILING simple multi-storey geometry / model sketch - HELP!](https://discourse.ladybug.tools/t/failing-simple-multi-storey-geometry-model-sketch-help/40755)

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**Author:** [@MichaelDonn](https://discourse.ladybug.tools/u/MichaelDonn)\
**Replies:** 5\
**Last updated:** [September 6, 2026, 9:51pm UTC](https://discourse.ladybug.tools/t/failing-simple-multi-storey-geometry-model-sketch-help/40755 "2026-09-06T21:51:15Z")

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Hi I am trying to demonstrate how a 12 storey urban building might be sketched with the potential to have different Window-to-wall ratios and different shading on each type of floor. RHINO Layers: Script design …

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## [Chilled Water Plant Loop - Pump Error](https://discourse.ladybug.tools/t/chilled-water-plant-loop-pump-error/40713)

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**Author:** [@Mara](https://discourse.ladybug.tools/u/Mara)\
**Replies:** 0\
**Last updated:** [August 24, 2026, 1:23pm UTC](https://discourse.ladybug.tools/t/chilled-water-plant-loop-pump-error/40713 "2026-08-24T13:23:32Z")

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Hi all, I’m running into a reproducible bug with Ironbug’s ChilledWaterLoop/CWLoop component and wanted to check whether this is known, and whether there’s a canvas-side fix I’m missing. Setup: Ironbug 1.21.0.0 on Rh…

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## [Free Future Meteorological Years (FMYs) for 5,000+ European locations](https://discourse.ladybug.tools/t/free-future-meteorological-years-fmys-for-5-000-european-locations/40704)

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**Author:** [@LittleBuddha](https://discourse.ladybug.tools/u/LittleBuddha)\
**Replies:** 0\
**Last updated:** [August 20, 2026, 10:52am UTC](https://discourse.ladybug.tools/t/free-future-meteorological-years-fmys-for-5-000-european-locations/40704 "2026-08-20T10:52:10Z")

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Following on from our TMY release, we’re excited to announce that Future Meteorological Years (FMYs) are now available on ClimateDataForBuildings.eu — giving practitioners a free, simulation-ready way to design for the c…

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## [Ladybug \[dragonfly\_grasshopper\] not loading after update with LB Versioner: "Access is denied"](https://discourse.ladybug.tools/t/ladybug-dragonfly-grasshopper-not-loading-after-update-with-lb-versioner-access-is-denied/40655)

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**Author:** [@AbrahamYezioro](https://discourse.ladybug.tools/u/AbrahamYezioro)\
**Replies:** 7\
**Last updated:** [August 16, 2026, 2:32am UTC](https://discourse.ladybug.tools/t/ladybug-dragonfly-grasshopper-not-loading-after-update-with-lb-versioner-access-is-denied/40655 "2026-08-16T02:32:27Z")

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Hi, After updating to the last version of LBT with the versioner, GH is failing to load LBT. The following image shows the image I get. It is related to access denied to Dragonfly\_grasshopper. I installed again LBT…

[Next page](https://discourse.ladybug.tools/c/ladybug-tools/27.md?page=1)