# \#sky

**URL:** https://discourse.ladybug.tools/tag/sky/110.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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## [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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## [Relative importance of individual EnergyPlus Fields](https://discourse.ladybug.tools/t/relative-importance-of-individual-energyplus-fields/10072)

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**Author:** [@ajeb](https://discourse.ladybug.tools/u/ajeb)\
**Replies:** 5\
**Last updated:** [October 20, 2025, 12:19pm UTC](https://discourse.ladybug.tools/t/relative-importance-of-individual-energyplus-fields/10072 "2025-10-20T12:19:41Z")

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Hi guys, New Rhino/Grasshopper/Ladybug/Honeybee/OpenStudio/EnergyPlus user here. Any help/advice the experts around here could provide would be greatly appreciated. :slightly\_smiling\_face::+1: For some context, I am wo…

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## [High-resolution sky patch](https://discourse.ladybug.tools/t/high-resolution-sky-patch/35771)

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**Author:** [@HSK](https://discourse.ladybug.tools/u/HSK)\
**Replies:** 5\
**Last updated:** [July 8, 2025, 8:07pm UTC](https://discourse.ladybug.tools/t/high-resolution-sky-patch/35771 "2025-07-08T20:07:12Z")

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Hello everyone, I am trying to create a high-resolution sky patch (and its values) with a finer resolution than the Reinhart Sky, using 10-minute intervals. As shown below, there are additional options, such as 2,305 s…

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## [Sky View Factor calculation: different possible approaches](https://discourse.ladybug.tools/t/sky-view-factor-calculation-different-possible-approaches/1569)

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**Author:** [@Francesco661](https://discourse.ladybug.tools/u/Francesco661)\
**Replies:** 6\
**Last updated:** [July 27, 2023, 7:03am UTC](https://discourse.ladybug.tools/t/sky-view-factor-calculation-different-possible-approaches/1569 "2023-07-27T07:03:39Z")

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The Ladybug\_Shading Mask component allows to define the Sky View Factor starting from a 3D model. The Rayman software or other sw allow to do the same starting from a real image captured with a fish-eye. I have seen …

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## [Convert Units HB False Color to view sky luminance](https://discourse.ladybug.tools/t/convert-units-hb-false-color-to-view-sky-luminance/22192)

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**Author:** [@rxs5160](https://discourse.ladybug.tools/u/rxs5160)\
**Replies:** 7\
**Last updated:** [July 11, 2023, 9:54pm UTC](https://discourse.ladybug.tools/t/convert-units-hb-false-color-to-view-sky-luminance/22192 "2023-07-11T21:54:33Z")

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Hello, I am hoping to view sky luminance values from CIE and weather based skies. I can generate the HB false color image but would like luminance values not W/sr-m2. The legend unit input is not accepting “cd/m2”. Wh…

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## [Does EPW file take daylight savings time into consideration?](https://discourse.ladybug.tools/t/does-epw-file-take-daylight-savings-time-into-consideration/1928)

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**Author:** [@Ibby](https://discourse.ladybug.tools/u/Ibby)\
**Replies:** 5\
**Last updated:** [November 15, 2022, 8:25pm UTC](https://discourse.ladybug.tools/t/does-epw-file-take-daylight-savings-time-into-consideration/1928 "2022-11-15T20:25:52Z")

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## [TMY/TMYx EPW weather data with high East-West deviation using GenCumulativeSky.exe](https://discourse.ladybug.tools/t/tmy-tmyx-epw-weather-data-with-high-east-west-deviation-using-gencumulativesky-exe/19041)

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**Author:** [@vhoang](https://discourse.ladybug.tools/u/vhoang)\
**Replies:** 2\
**Last updated:** [July 28, 2022, 1:48pm UTC](https://discourse.ladybug.tools/t/tmy-tmyx-epw-weather-data-with-high-east-west-deviation-using-gencumulativesky-exe/19041 "2022-07-28T13:48:23Z")

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Hi everyone, We have an issue with the Honeybee\_Generate Cumulative Sky component using different TMY-Datasets. We tried with 2 different sources of EPW files, including PV-GIS and climate.onebuilding.org and both resu…

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## [LB Cumulative Sky Matrix](https://discourse.ladybug.tools/t/lb-cumulative-sky-matrix/18101)

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**Author:** [@MagnusRathenborg](https://discourse.ladybug.tools/u/MagnusRathenborg)\
**Replies:** 1\
**Last updated:** [April 29, 2022, 11:34pm UTC](https://discourse.ladybug.tools/t/lb-cumulative-sky-matrix/18101 "2022-04-29T23:34:55Z")

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Hey everyone, I’m trying to calculate different shading factors using different types of geometry and the components “LB Sky Matrix” and “LB Incident Radiation”. I wanna make it so the user can choose to get monthly val…

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## [Custom Sky in Honeybee](https://discourse.ladybug.tools/t/custom-sky-in-honeybee/3024)

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**Author:** [@devang](https://discourse.ladybug.tools/u/devang)\
**Replies:** 10\
**Last updated:** [March 11, 2022, 1:44pm UTC](https://discourse.ladybug.tools/t/custom-sky-in-honeybee/3024 "2022-03-11T13:44:05Z")

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Is there a way to generate sky with direct horizontal irradiance and diffuse horizontal irradiance?

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## [Failed to Create Sky](https://discourse.ladybug.tools/t/failed-to-create-sky/17243)

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**Author:** [@Rhynoxas](https://discourse.ladybug.tools/u/Rhynoxas)\
**Replies:** 5\
**Last updated:** [February 1, 2022, 1:04pm UTC](https://discourse.ladybug.tools/t/failed-to-create-sky/17243 "2022-02-01T13:04:54Z")

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Why do I keep getting “failed to Create Direct / Total Sky” error message from HB PMV component? I linked the report error message in which runtime error say “None zero return code: 1”. Thank’s. report\_out.txt (900.…

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## [Import EPW error using clear sky model](https://discourse.ladybug.tools/t/import-epw-error-using-clear-sky-model/17274)

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**Author:** [@David1](https://discourse.ladybug.tools/u/David1)\
**Replies:** 1\
**Last updated:** [January 30, 2022, 5:33pm UTC](https://discourse.ladybug.tools/t/import-epw-error-using-clear-sky-model/17274 "2022-01-30T17:33:13Z")

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I tried to use the clear sky mode and the python code to combine the epw and stat converted WEA file together. But after I run it, the python script throws an error like the following: Solution exception:‘EPW’ object h…

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## [Saving int\_mtx : possible?](https://discourse.ladybug.tools/t/saving-int-mtx-possible/16406)

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**Author:** [@seghier](https://discourse.ladybug.tools/u/seghier)\
**Replies:** 0\
**Last updated:** [November 1, 2021, 6:11pm UTC](https://discourse.ladybug.tools/t/saving-int-mtx-possible/16406 "2021-11-01T18:11:54Z")

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Hello, is there a way to save or internalize int\_mtx?

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## [What type of sky is generate for daylight simulation in HB+ and new HB1.3? (Isotropic, Anisotropic)](https://discourse.ladybug.tools/t/what-type-of-sky-is-generate-for-daylight-simulation-in-hb-and-new-hb1-3-isotropic-anisotropic/16204)

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**Author:** [@Matteo](https://discourse.ladybug.tools/u/Matteo)\
**Replies:** 3\
**Last updated:** [October 21, 2021, 8:28pm UTC](https://discourse.ladybug.tools/t/what-type-of-sky-is-generate-for-daylight-simulation-in-hb-and-new-hb1-3-isotropic-anisotropic/16204 "2021-10-21T20:28:42Z")

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Hello everyone, I have a question regarding the type of sky used in the simulations of Honeybee \[+\] and the new LBT. What type of sky (i.e. isotropic or anisotropic) is used in the recipes such as RAD, ANN, DC, 3 and 5…

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## [I cant make my sky matrix turn orange](https://discourse.ladybug.tools/t/i-cant-make-my-sky-matrix-turn-orange/16275)

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**Author:** [@4mardin](https://discourse.ladybug.tools/u/4mardin)\
**Replies:** 2\
**Last updated:** [October 21, 2021, 3:18pm UTC](https://discourse.ladybug.tools/t/i-cant-make-my-sky-matrix-turn-orange/16275 "2021-10-21T15:18:18Z")

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hello, i loaded anythin on this folder, but my sky matrix isnt work. help is needed , thanks

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## [Iterating (for loop) IncidentRadiation analysis over all hours of the year (HOY's) - Ladybug](https://discourse.ladybug.tools/t/iterating-for-loop-incidentradiation-analysis-over-all-hours-of-the-year-hoys-ladybug/16116)

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**Author:** [@Denis](https://discourse.ladybug.tools/u/Denis)\
**Replies:** 4\
**Last updated:** [October 8, 2021, 7:32pm UTC](https://discourse.ladybug.tools/t/iterating-for-loop-incidentradiation-analysis-over-all-hours-of-the-year-hoys-ladybug/16116 "2021-10-08T19:32:19Z")

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Hello everybody, I am performing solar analysis with Ladybug, specifically with IncidentRadiation 1.2.0. This module returns irradiation in kWh/m2 for a specific time interval, which is previously defined by means of th…

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## [Honeybee\_Reading Indoor View Factor Values](https://discourse.ladybug.tools/t/honeybee-reading-indoor-view-factor-values/14159)

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**Author:** [@Liva\_Balode](https://discourse.ladybug.tools/u/Liva_Balode)\
**Replies:** 0\
**Last updated:** [April 19, 2021, 12:35pm UTC](https://discourse.ladybug.tools/t/honeybee-reading-indoor-view-factor-values/14159 "2021-04-19T12:35:56Z")

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Dear All, Hope you are well. I am trying to conduct a study of Indoor (Interior) View Factor to see whether 80% of the space (office room) has access to direct skylight which is a criterion in BREEAM and other guidelin…

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## [Error: Shading Mask is flipped in Rhino 7](https://discourse.ladybug.tools/t/error-shading-mask-is-flipped-in-rhino-7/12455)

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**Author:** [@tiffiena](https://discourse.ladybug.tools/u/tiffiena)\
**Replies:** 13\
**Last updated:** [January 29, 2021, 6:55pm UTC](https://discourse.ladybug.tools/t/error-shading-mask-is-flipped-in-rhino-7/12455 "2021-01-29T18:55:55Z")

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Hi all, When I was running the Shading Mask component in newly installed Rhino 7, the dome shown was flipped underground as the picture. However this file works well in my Rhino 6. Not sure what the reason is. Does anyo…

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## [Honeybee and Ladybug skies for radiation analysis](https://discourse.ladybug.tools/t/honeybee-and-ladybug-skies-for-radiation-analysis/5127)

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**Author:** [@M.Gkaintatzi](https://discourse.ladybug.tools/u/M.Gkaintatzi)\
**Replies:** 8\
**Last updated:** [February 11, 2019, 8:36am UTC](https://discourse.ladybug.tools/t/honeybee-and-ladybug-skies-for-radiation-analysis/5127 "2019-02-11T08:36:34Z")

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Hi! I have a question about the different skies in HB and LB for a radiation analysis. I have seen some posts from other people asking similar questions, but I just want to make sure I understand everything correctly. A…

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## [CIE Overcast sky with specific horizontal illuminance](https://discourse.ladybug.tools/t/cie-overcast-sky-with-specific-horizontal-illuminance/3877)

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**Author:** [@farhang.tahmasebi](https://discourse.ladybug.tools/u/farhang.tahmasebi)\
**Replies:** 4\
**Last updated:** [October 6, 2018, 7:05pm UTC](https://discourse.ladybug.tools/t/cie-overcast-sky-with-specific-horizontal-illuminance/3877 "2018-10-06T19:05:32Z")

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Dear HB daylighting experts, I was wondering if there is a component or a native workflow in Honeybee to generate a CIE overcast sky using horizontal illuminance as input. Thank you for your help. On a side note, as a …

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## [Generate custom sky with gendaylit for a particular minute](https://discourse.ladybug.tools/t/generate-custom-sky-with-gendaylit-for-a-particular-minute/3116)

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**Author:** [@IasonBournas](https://discourse.ladybug.tools/u/IasonBournas)\
**Replies:** 2\
**Last updated:** [June 13, 2018, 12:09pm UTC](https://discourse.ladybug.tools/t/generate-custom-sky-with-gendaylit-for-a-particular-minute/3116 "2018-06-13T12:09:30Z")

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Hi, i have irradiance measurements in minute intervals, and would like to create a sky model using gendaylit for a particular point-in-time, for instance on March 18th, at 15:12. The genCustomSky does not have a “min…

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## [Sky dome diffuse sum not matching weather data](https://discourse.ladybug.tools/t/sky-dome-diffuse-sum-not-matching-weather-data/2991)

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**Author:** [@farhang.tahmasebi](https://discourse.ladybug.tools/u/farhang.tahmasebi)\
**Replies:** 2\
**Last updated:** [May 18, 2018, 8:35am UTC](https://discourse.ladybug.tools/t/sky-dome-diffuse-sum-not-matching-weather-data/2991 "2018-05-18T08:35:02Z")

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Hi, I am just having fun exploring skyDome, which is a great component for education and wanted to suggest that, it would be better if it gives outputs with at least three decimal places. The thing is, its unit is quit…

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## [Watch the Sky HDR output units?](https://discourse.ladybug.tools/t/watch-the-sky-hdr-output-units/2894)

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**Author:** [@IasonBournas](https://discourse.ladybug.tools/u/IasonBournas)\
**Replies:** 5\
**Last updated:** [April 29, 2018, 2:05pm UTC](https://discourse.ladybug.tools/t/watch-the-sky-hdr-output-units/2894 "2018-04-29T14:05:02Z")

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Hi, i am trying to visualize false-color images of different skies, showing cd/m2, for educational reasons. The WatchtheSky component is just perfect for this. I noticed it writes 3 different HDR files whose names end…

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## [Sky exposure factor](https://discourse.ladybug.tools/t/sky-exposure-factor/2500)

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**Author:** [@Ivanita](https://discourse.ladybug.tools/u/Ivanita)\
**Replies:** 6\
**Last updated:** [January 31, 2018, 2:58pm UTC](https://discourse.ladybug.tools/t/sky-exposure-factor/2500 "2018-01-31T14:58:09Z")

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Hi, I am using the ladybug view analysis to find out the sky exposure factor on a vertical facade. However, though the average value is acceptable, some of the result is higher than 0.5 (shouldn’t be larger than 0.5). I…

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## [Annual Radiance Study — Sky "Resolution"](https://discourse.ladybug.tools/t/annual-radiance-study-sky-resolution/1897)

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**Author:** [@JasonSmith](https://discourse.ladybug.tools/u/JasonSmith)\
**Replies:** 1\
**Last updated:** [June 4, 2017, 7:56pm UTC](https://discourse.ladybug.tools/t/annual-radiance-study-sky-resolution/1897 "2017-06-04T19:56:00Z")

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I've used forward tracing to study the effect of a series of reflectors on a west-facing facade, trying to get the limited direct light from that elevation as deeply into a space as possible. I'm now trying to run an …

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## [Can cumulative sky matrix be stored in a data component?](https://discourse.ladybug.tools/t/can-cumulative-sky-matrix-be-stored-in-a-data-component/1773)

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**Author:** [@Grasshope](https://discourse.ladybug.tools/u/Grasshope)\
**Replies:** 8\
**Last updated:** [April 13, 2017, 6:05am UTC](https://discourse.ladybug.tools/t/can-cumulative-sky-matrix-be-stored-in-a-data-component/1773 "2017-04-13T06:05:00Z")

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I got the following error when reading from a data component with one set of cumulative sky matrix data “internalized”: Does this mean cumulative sky matrix cannot be stored? Appreciate your kind advice. Ji unable…

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## [Abnormal sky radiation of Tregenza sky for low altitude sun positions](https://discourse.ladybug.tools/t/abnormal-sky-radiation-of-tregenza-sky-for-low-altitude-sun-positions/1778)

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**Author:** [@Grasshope](https://discourse.ladybug.tools/u/Grasshope)\
**Replies:** 4\
**Last updated:** [April 10, 2017, 9:04am UTC](https://discourse.ladybug.tools/t/abnormal-sky-radiation-of-tregenza-sky-for-low-altitude-sun-positions/1778 "2017-04-10T09:04:00Z")

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It seems when the sun altitude is low (early morning sun close to horizon), the Tregenza sky dome visualization of the sky radiations on the 145 patches is quite strange: sun position for 1-Jan 8pm, using Singapore epw …

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## [Use Honeybee Gen Custom Sky component as a direct radiation source](https://discourse.ladybug.tools/t/use-honeybee-gen-custom-sky-component-as-a-direct-radiation-source/1742)

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**Author:** [@MikeJohnson](https://discourse.ladybug.tools/u/MikeJohnson)\
**Replies:** 7\
**Last updated:** [April 4, 2017, 2:06pm UTC](https://discourse.ladybug.tools/t/use-honeybee-gen-custom-sky-component-as-a-direct-radiation-source/1742 "2017-04-04T14:06:00Z")

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Hi all, I would like to conduct a radiation study using Honeybee for a given solar position and given direct / diffuse radiation values. I am currently using the GenCustomSky Honeybee component (see file below). I am …

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## [Change Perez coefficients for solar radiation modelling under Ladybug or honeybee](https://discourse.ladybug.tools/t/change-perez-coefficients-for-solar-radiation-modelling-under-ladybug-or-honeybee/1741)

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**Author:** [@XULE](https://discourse.ladybug.tools/u/XULE)\
**Replies:** 2\
**Last updated:** [March 27, 2017, 10:07pm UTC](https://discourse.ladybug.tools/t/change-perez-coefficients-for-solar-radiation-modelling-under-ladybug-or-honeybee/1741 "2017-03-27T22:07:00Z")

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Hi all, i have tricky issue to ask you about customizing Perez coefficient under ladybug/honeybee/Radiance. I need to improve the accuracy for solar radiation modelling for my projects. One of the solution is to adjust s…

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## [ERROR on "runDaylightAnalysis"](https://discourse.ladybug.tools/t/error-on-rundaylightanalysis/1744)

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**Author:** [@IsabellaEloyCavalcan](https://discourse.ladybug.tools/u/IsabellaEloyCavalcan)\
**Replies:** 8\
**Last updated:** [March 25, 2017, 8:40pm UTC](https://discourse.ladybug.tools/t/error-on-rundaylightanalysis/1744 "2017-03-25T20:40:00Z")

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Hello everyone, I’m having a problem with component runDaylightAnalysis and the balon is not helping me to solve it. It just say: “solution exception: ddc8f832-a857-4377-9418…” Anyone knows what is this about?

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## [Radiation analysis without epw weather file](https://discourse.ladybug.tools/t/radiation-analysis-without-epw-weather-file/1733)

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**Author:** [@MikeJohnson](https://discourse.ladybug.tools/u/MikeJohnson)\
**Replies:** 38\
**Last updated:** [March 24, 2017, 11:05am UTC](https://discourse.ladybug.tools/t/radiation-analysis-without-epw-weather-file/1733 "2017-03-24T11:05:00Z")

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