EMap and curviture analysis not responding well

Serengeti (Rhino WIP)
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send to forum.3dm (222.0 KB)
Hi Forum, Try and use emap or curvature analysis. Getting unusual results. Thanks,Mark
Also trying to snap a line while surface points are on to a point. It will snap to some.

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It looks fine here:

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Hi John, can you turn the points on the surface and start line command and get the start point of the line to snap to any of the points turned on ? Thank you ,Mark

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Yes, when using the Vertex osnap.

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Thanks for checking. —Mark