Self intersecting surfaces

How to check a surface for self-intersection. Also, then identifying the intersection for a probable fix to the geometry…?

Thanks in advance!!

Hello- setting a display mode to show colored back faces is one way to locate these:

-Pascal

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I would use Mesh command to convert the surface to a mesh and then I would use MeshSelfIntersect command to find the self-intersections.

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IntersectSelfSrf is somethig that I also need, and a few others in other topics.
Any chance for it in Rhino 8?

Kind regards.