How to create a U/V Curve on a surface?

hohox

How can I create a U/V Curve on a select surface?

I did this with "GetURange", "GetVRange", "CreateParametricCurveU" and "CreateParametricCurveV".

Sometime it works well, but sometime it cannot create the curve.

I guess the range along U or V sometimes got wrong.

 

Dose anyone konw how to do? Thanks a lot! 

Johannes Weiman old account

It sounds like you're doing it right. Do you get an error message?

regards,
Johannes

hohox

yes, get error message like this: Geometry system(ACIS) Error code: 87003 "attempt to fit curve to zero knot span"

And sometimes it can create some curves, but the parameter range seems wrong. The curves in the range only appears in one half of the surface, but acturally the other half of the surface should be able to have curves.

 

Thanks a lot