all edges are perfectly vertical why is this happening?
Upload the file so people can look at it.
if you want to analyse Normal direction use the
_dir command
you screenshot shows the gumball - the blue (z-) direction depends on
_gumballAlignment- that can be Cplane/Object/World or freely adjusted…
the artefacts of your surface look like a meshing - problem.
save the File with a new name and choose option “save small” close rhino maybe restart and reopen the “save small” file. - this will force rhino to recalculate the render-mesh.
to make sure / analyse if it is the render-mesh, you can _extractRenderMesh and look at this mesh.
_shrinkTrimmendSurface
_mergeFaces
delete face and _cap
… might be other approaches
and yes as @christopher.ho told you: post the file with only the affected polysurface and we can help better.
good look - best -tom
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