# Ladybug for large urban scenes, shading context and solar radiation

**URL:** <https://discourse.ladybug.tools/t/ladybug-for-large-urban-scenes-shading-context-and-solar-radiation/21429>\
**Category:** ladybug-tools\
**Tags:** ladybug, shading, radiation\
**Created:** [April 11, 2023, 3:52pm UTC](https://discourse.ladybug.tools/t/ladybug-for-large-urban-scenes-shading-context-and-solar-radiation/21429 "2023-04-11T15:52:37Z")\
**Posts on this page:** 1\
**Showing post:** 10

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**Author:** ![eshirinyan](https://discourse.ladybug.tools/user_avatar/discourse.ladybug.tools/eshirinyan/32/31501_2.png) [@eshirinyan](https://discourse.ladybug.tools/u/eshirinyan)\
**Post date:** [April 19, 2023, 9:01am UTC](https://discourse.ladybug.tools/t/ladybug-for-large-urban-scenes-shading-context-and-solar-radiation/21429/10 "2023-04-19T09:01:41Z")

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This was very insightful, Charlie!

I hope I have some results for you.

- Sky Mask component is not linked directly to the calculation itself, as we have discussed above
- If Tregenza Sky dome is set, patch vectors are a bit misaligned with the resulting dome. And we can see that the matrix with 145 patches (x2 for full sphere ?) is not sufficient for complex urban scene. But I don’t get it why LB uses a highres version of Tregenza - just for viz purposes?
- If Reinhart Sky dome is set, we get all the vectors aligned with patches.
- Finally I have tried to get the real sky mask using Mesh Ray intersection.
- in 1.6.0 there is an output from Sky dome as “vis\_set” (I have been used 1.5.0) but I didn’t find anything interesting.

It was quite useful to me to enhance my understanding of some Grasshopper basics, thanks to your definition.

 ![reinhart](https://discourse.ladybug.tools/uploads/default/original/3X/2/c/2c8c3014ecd549b841c7e9066815d92088ce24ad.jpeg)  
[Sky Mask Radiation Visualisation\_ES.gh](https://discourse.ladybug.tools/uploads/short-url/gza8zeHxnyjGuVGI9bvtZiG0Aqk.gh) (55.6 KB)  
 ![sky_mask_reinhart](https://discourse.ladybug.tools/uploads/default/original/3X/9/4/940c935e22c823ae9e22b797d2b5d01b448784cc.jpeg)  
 ![tregenza](https://discourse.ladybug.tools/uploads/default/original/3X/6/4/6476492246570e5fc61e6ea798c778afc170e36c.jpeg)

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