Grasshopper

algorithmic modeling for Rhino

Hello,

I'm doing a sunlight hours analysis on a group of buildings and am interested specifically in their south facing facades. If anyone can tell me what is the best way to select surfaces according to the direction they are facing it would be greatly appreciated.

thanks!

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You can check the angle between normal of the surfaces and south vector. Here is an example.

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worked perfectly, thanks for the quick reply!

You're a guru Mostapha very useful thankyou!

Could this be in any way useful for a low-CPU-load process of finding the visible surface(s) of buildings to one particular building? I have made a definition but I think it's not the best way to do it and it's also buggy.

Check the view analysis component.

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