Hi,
I don’t know why the bottom half of the building doesn’t show any solar radiation on surface. Is there a trick to it i am missing? I have run this on many projects before and it never did this.
Thanks!
Climate Study Error.gh (58.0 KB)
It’s a surface normals problem
I assume the model comes from rhino, so all the surfaces where the arrow in going inside of your geometry (full blue surfaces, not partial blue), you should use the rhino command “Flip”.
But only on those ones, don’t flip the whole model 
Climate Study Error.gh (56.0 KB)
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Yes, i started suspecting it and was trying to reverse the surface normals as you mentioned. I appreciate the help! Thanks.