Percentage of Visible Sky

grasshopper ladybug-legacy
1

I am just wondering if there is a way to do daylight condition analysis using Waldram Diagram.

I have checked the old forum regarding this topic, and the post is as follows: http://www.grasshopper3d.com/forum/topics/creating-waldram-diagram?id=2985220%3ATopic%3A1701818&page=3#comments

Can anyone suggest an example file to calculate the percentage of sky exposure that a building’s profile allows through to the street below? What is the methodology behind to create a projection of the building on a graph?

Thank you in advance.

Best

John

2

Hi @johnchun,
Are you looking for something other than Mostapha provided in the example file in the Grasshopper thread you posted? I see a GH file that Mostapha provided in the thread.

3

Thanks for the reply.

I have checked Mostapha’s definition showing Waldram diagram, which looks promising. But, how can we calculate/read the percentage of sky exposure from the graph in the output?

Maybe I am lack of understanding this graph. Any explanation is really appreciated.

Best

John

4

Does this help?

Shading Mask
Shading Mask.png1362×516 81.2 KB
Shading Mask.gh (411.9 KB)

2 Likes
5

This would be another way to get the percentage of sky visible from a geometry.

SkyView
SkyView.png1362×516 116 KB
SkyView.gh (401.7 KB)

1 Like
6

For future reference the definition is also posted here: Cartesian solar path Waldram Diagram

1 Like
7

Great. Thank you very much.

10

For those visiting this post in the future, there will always be up-to-date example files of the sky mask here:
http://hydrashare.github.io/hydra/viewer?owner=chriswmackey&fork=hydra_2&id=Shading_Strategies_On_Sun_Path&slide=0&scale=1&offset=0,0

And of the sky view study here:
http://hydrashare.github.io/hydra/viewer?owner=chriswmackey&fork=hydra_2&id=Sky_View_in_an_Urban_Canyon&slide=0&scale=1&offset=0,0