Iso Lines Curves not matching with surface edges

why curve.ByIsoCurveOnSurface take the below behavior and not match with surface edge.

Hi @fathygad

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Hi @Kulkul , i did that but i just want to understand why dynamo don’t detect exactly the surface appear to me , it seem it detect the bounding box boundaries of the surface?

@fathygad Curve by IsoCurve on Surface will create a curve that is the isocurve on a surface by specifying the U or V direction only, and specifying the parameter in the opposite direction at which to create the curve. The ‘direction’ input determines which direction of isocurve to create. A value of one corresponds to the u-direction, while a value of zero corresponds to the v-direction. Hope that make Sense!

@fathygad Could you describe more what kind of surface your looking for?

for the below surface why iso line don’t fit with surface edges and why it extend to it’s Boundry Box Limit?!!

@fathygad You could report here

Might be related to this reported issue…