Parametric columns

Hii im pretty new to ghp, and I was wondering if anyone could help me find a way where I can make my columns to stop right where the ceiling ends? I cant figure out how to make every column to stop right where the ceiling does so no column is peeking like the back ones. Thanks in advance! (3.6 MB)

Here is a way, it is not

because the surface are not planar. So you choose planar surfaces or not planar end of column.

Take many point on each circle, move them quite high. Then throw a ray toward the ground, take the higher coordinate. I join meshes to have a single mesh. (3.6 MB)

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Thank you so much! I see why now