U or V isoCurve on Surface?

by Gene Kao

Feb 4, 2014

I just wondering how does the Surface determined which is U and which is V? 

Sometimes it is a little bit annoying when I try to find curves on surface...... anyone got explanation or know how to solve this? 

Or is it because EdgeSurface component cause the problem? 

  • up

    David Rutten

    It depends on the type of surface. PlaneSurface uses the axis directions of the underlying plane (x=u, y=v). RevSurface always has u going around and v going up, i.e. the revolution profile is the direction of v. For nurbs surfaces it just depends on how the control-points are oriented.

    However surface U V directions can be flipped and transposed, so it's difficult to predict ahead of time which will be which.

    --

    David Rutten

    david@mcneel.com

    1

    Feb 4, 2014