Extracts an isoparametric curve from a surface in U or V direction. This command creates a curve that is not attached to the surface although it exactly runs on the surface.
This command is useful for creating trimming curves on surfaces.
Isoparametric curves can also be used to recreate a given surface with different parameterization. Extract several isoparms and use the Loft or Skin command to create a surface through them. An isoparametric curve extracted from a surface can be used as a snappable location when you need to place an object on such surface.
How to use
1. Select a NURBS surface.
2. Click the Extract isoparametric curve icon or choose the Tools > Curves > Extract isoparametric curve command.
3. In the Modeling Tool panel specify the direction (U or V). In the Parameter section, type a value between 0 and 1 or move the slider to interactively change the position of the isoparametric curve over the surface. The isoparametric curve is displayed in dark green.
4. Press the Go button when you have reached the desired position.
Options
Isoparm direction
To choose whether to extract the isoparm in the U or V direction.
Modeling
Tool panel. Switch one of the following
radio buttons on:
U direction if you want to extract a curve in the U direction.
V direction if you want to extract a curve in the V direction.
Parameter
To choose where to extract the curve along the U or V direction.
Modeling Tool panel. Set the value either by moving the slider or by typing it in the data field and pressing Enter. The value can range from 0 to 1.