# Accelerating multiple "HB point-in-time grid-based" simulations

**URL:** <https://discourse.ladybug.tools/t/accelerating-multiple-hb-point-in-time-grid-based-simulations/30188>\
**Category:** feature\
**Tags:** ladybug, daylight\
**Created:** [July 22, 2024, 7:32am UTC](https://discourse.ladybug.tools/t/accelerating-multiple-hb-point-in-time-grid-based-simulations/30188 "2024-07-22T07:32:05Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Simon\_O\_Weber](https://discourse.ladybug.tools/letter_avatar_proxy/v4/letter/s/57b2e6/32.png) [@Simon\_O\_Weber](https://discourse.ladybug.tools/u/Simon_O_Weber)\
**Post date:** [July 22, 2024, 7:32am UTC](https://discourse.ladybug.tools/t/accelerating-multiple-hb-point-in-time-grid-based-simulations/30188/1 "2024-07-22T07:32:05Z")

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Dear scientific Ladybug community,

within my research on switchable membrane cushion constructions I need the so-called incidence operator of the facade for different angles of incidence. (You can find more about the RadiCal methodology in the dissertation by Daniel Rüdisser [https://www.radi-cal.org/](https://www.radi-cal.org/))

Here’s my gh script:  
[main.gh](https://discourse.ladybug.tools/uploads/short-url/r61feGNwQEozV9eq9tj345mTtPP.gh) (90.5 KB)

Compared to a simulation with the “HB Annual Daylight”, no sky matrices based on real weather data at a specific location are required. In a broader sense, multiple “HB point-in-time grid-based” simulations are carried out. The sensor brightnesses are simulated for different incidence angle pairs, in my case 1000 randomly selected pairs over the hemisphere, with a defined direct normal radiation **without** diffuse horizontal radiation. Without diffuse horizontal radiation and with a slope facing up (slope=0), there is also no ground diffuse radiation active.

 ![grafik](https://discourse.ladybug.tools/uploads/default/original/3X/2/d/2d9c7b4cafbe461b8f546a032f9e1986a4b1d319.jpeg)

However, my current Grasshopper script requires between 3 and 24 hours, depending on the radiance accuracy to calculate the 1000 incidence angle pairs. I am of the opinion that a reduction to 5-10 minutes is possible by creating a quasi-“HB Annual Daylight” simulation with own “weather data” and by merging certain work steps.

Do you know how to solve that problem? We would also support the programming of a Grasshopper plugin financially. I would be very happy about your help or quotations.

Kind regards

Simon Weber, M.Sc.  
Research Associate

Institute for Acoustics and Building Physics  
Pfaffenwaldring 7  
70569 Stuttgart  
Germany  
E-Mail: [simon.weber@iabp.uni-stuttgart.de](mailto:simon.weber@iabp.uni-stuttgart.de)

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<div class="post-metadata">

**Author:** ![Simon\_O\_Weber](https://discourse.ladybug.tools/letter_avatar_proxy/v4/letter/s/57b2e6/32.png) [@Simon\_O\_Weber](https://discourse.ladybug.tools/u/Simon_O_Weber)\
**Post date:** [July 1, 2026, 8:20am UTC](https://discourse.ladybug.tools/t/accelerating-multiple-hb-point-in-time-grid-based-simulations/30188/2 "2026-07-01T08:20:25Z")

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Hi all,

this was solved with the help of @sarith. Thanks for that. It’s part of the sampling step within the incidence operator method. More details in our publication: [https://www.researchgate.net/publication/395416022\_A\_parametric\_design\_integrated\_sampling\_and\_general\_training\_approach\_for\_optimal\_control\_oriented\_surrogate\_models\_of\_light-related\_quantities](https://www.researchgate.net/publication/395416022_A_parametric_design_integrated_sampling_and_general_training_approach_for_optimal_control_oriented_surrogate_models_of_light-related_quantities)

Feel free to contact, in case you have the same problem.

Kind regards

Simon Weber, M.Sc .

Research Associat e

Institute for Acoustics and Building Physi cs

Pfaffenwaldring 7

70569 Stuttgart

Germany

Tel: +49 711 685 66301

E-Mail: [simon.weber@iabp.uni-stuttgart.de](mailto:simon.weber@iabp.uni-stuttgart.de)

Website: [http://www.iabp.uni-stutt](http://www.iabp.uni-stutt) [gart](http://gart.de)[.de](http://gart.de)

[https://orcid.org/0000-0002-6](https://orcid.org/0000-0002-6) 268- 8547