The surface created in Grasshopper is actuallyIs it on a plane where construction is possible?There are often cases to check.

Slightly rough plane check

Inside Grasshopper's native components"Is Planar” is available. It is a component that determines whether the input Surface is flat or not by True/False.Even if it is not a perfect plane, it will be True. It can only be used for rough flatness checks.

Precise flatness check

For a more precise flatness check, use LunchBox's "Flatness check"there is. to DeviationsActual distortion displayed as a numberwill be

Considering that construction errors will occur in later processes, it is necessary to generate a more precise model in the design phase.