An issue about view analysis

[sufia89]

Hi
I saw “View to the Outdoors Through a Facade” file and in its description, it was said: "a quality view is defined as an area with a view factor angle of 20 degrees or greater (or 2% of this full 360 field of view). Actually, I’ve read that research paper about different views to the outdoor, but I can’t understand why we should use 2% to cover 20 degrees of 360 field of view? Isn’t correct to use 5.5%?

Thanks in advance

[mostapha]

We need more information to be able to help. This should be a helpful reference: https://discourse.ladybug.tools/faq

[m_sharajabian]

hello
this is my question too. can enyones help me? @chris

thanks

[chris]

See here for the explanation:

Occupant's view to the outdoors - ladybug component

Sorry for the late reply here. The reason why I used 2% instead of 5.6% is that we’re doing a 3D View analysis here (not a 2D one) and I took 20 degrees to be one dimension of the the solid angle of the view. So I interpret a “quality view” to be one that is 20 degrees by 20 degrees OR a non-square view with an solid angle equivalent to 20 deg x 20 deg. 2% makes sense when you consider that, when _viewTypeOrPoints is set to 1 - Horizontal 60 Degree Cone of Vision on the “Ladybug_View Analysis”…

5.5% is the correct number when the view analysis is purely 2D. But translating this into a 3D world requires a bit of interpretation.