U and V Iso Curves

U and V iso curves are dependent curves created from the iso (isoparametric) lines of a NURBS surface. You can use U and V iso curves to trim surfaces.

• Select a NURBS object. > Modify panel > Create Curves rollout > Dependent Curves group box > U Iso Curve button or V Iso Curve button
• Select a NURBS object. > Modify panel > NURBS toolbox > (Create U Iso Curve) or (Create V Iso Curve)

Iso curves in the U and V dimensions

Procedures

To create an iso curve:

• Turn on (Create U Iso Curve) or (Create V Iso Curve), then drag over the surface.

  The iso lines are highlighted in blue as you drag.

  Click to create the curve from the highlighted iso line.

Interface

Iso Curve rollout (creation time)

Position

Sets the iso curve's position along the U or V axis of the surface.

This parameter is animatable.

Trim Controls group

Trim

When on, trims the surface against the iso curve.

Flip Trim

When on, flips the direction of the trim.

Seed 1 / Seed 2

Change the UV location of the seed value on the surface. If there is a choice of projections, the projection closest to the seed point is the one used to create the curve.

Iso Curve rollout (modification time)

Position

Sets the iso curve's position along the U or V axis of the surface.

This parameter is animatable.

Trim Controls group

Trim

When on, trims the surface against the iso curve.

Flip Trim

When on, flips the direction of the trim.

Seed 1 / Seed 2

Change the UV location of the seed value on the surface. If there is a choice of projections, the projection closest to the seed point is the one used to create the curve.

Replace Base Surface

Lets you replace the parent surface. Click the button, then click the new surface on which to base the iso curve.