I have the following problem, I would like to get hourly values of direct sunlight to know if a surface has for example at least x-hours of direct sunlight every day. Is that possible?


Would be great if someone has an idea.



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If it's an exterior surface, you could hack together a simple solution using vectors from the SunPosition component, and Grasshopper's MeshRay intersect component.  (Join the meshes in GH before passing to MeshRay.)  You'll have to calculate the stats yourself -- you might find it helpful to place the vectors for each day in a separate branch, like so:


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