EMap and curviture analysis not responding well

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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.

It looks fine here:

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

Yes, when using the Vertex osnap.

Thanks for checking. —Mark