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Editing NURBS

Editing NURBS

Align a curve with a curve or surface

 

User Guide > Modeling > NURBS Modeling > Editing NURBS > 

Reshape a curve or surface manually

To move CVs on a curve or surface

1. Choose the Move tool.
2. Press on the curve or surface and choose Control Vertex.
3. Select the CVs you want to edit and use the manipulator to move them.
   TipWith a CV selected you can press the and keys to select the next/previous CV in the row. On a surface, press the and keys to select the next/previous CV in the column.
   NoteAvoid tweaks (moving CVs) on objects with history. If you tweak an object with history, the tweak is applied to a specific component ID. Subsequent changes to the object’s history can cause the component IDs to change, altering the effect of the tweak.

   For example, if you revolve a curve to create a surface, then tweak CV number 3 on the surface, the tweak will always apply to CV number 3. If you later change the revolve node attributes to reduce the number of segments on the surface, the CV that you tweaked will now have a new number, and the tweak will no longer be applied to it. The tweak will be applied to the CV that is now number 3, which may be in a different location on the surface.

To reshape a curve with the Curve Editing tool

1. Select Edit Curves > Curve Editing Tool.
2. Click the curve.

   

3. Do any of the following:
   • Drag the parameter position handle to move the manipulator along the curve.
   • Drag the point position handle to move this point. The curve will reshape so the curve passes through the point as you move it.
   • Drag the tangent direction handle to change the direction of the curve at this point.
   • Drag the tangent scale handle to change the “speed” of the curve at this point.
   • Click a dashed line to align the tangent at this point with one of the axes.

To reshape a surface with the Surface Editing tool

1. Select Edit NURBS > Surface Editing > Surface Editing Tool.
2. Click the surface.

   

3. Do any of the following:
   • Drag the parameter position handle to move the manipulator across the surface.
   • Drag the point position handle to move this point. The surface will reshape so the surface touches the point as you move it.
   • Click the tangent direction toggle (the double circle) to switch between editing the U, V, and Normal tangent.
   • Drag the tangent direction handle (the box) to change the tangent of the surface at this point.
   • Drag the tangent scale handle to change the “speed” of the tangent at this point.
   • Click a dashed line to align the tangent at this point with one of the axes.
     TipThe Surface Editing Tool deforms a region within two spans of the manipulator. Deformation decreases with distance from the tool position.

     You can use the Snap to curves option in the Status Line to snap the manipulator to an isoparm, or Snap to grids to snap to a patch corner. The snapping occurs to the isoparms or patch corners that appear when you display the object with Display > NURBS > Rough—not the isoparms or patch corners that appear only with finer Smoothness settings.

To reshape a curve or surface with the Soft Modification tool, see the following:

• Smooth a curve
• Extend a surface
• Sculpt a NURBS or polygon surface mesh
• What is soft modification? in the Deformers guide
• Use the Soft Modification Tool in the Deformers guide
• What are deformers? in the Deformers guide