CloseCrv

Closes open curves either with a straight segment or by moving the endpoints to the start point if they are within joining tolerance of one another.

Steps:

• Select open curves and press Enter.

• The number of curves closed by adding segments and the number closed by moving endpoints are reported.

CrvSeam

Changes the seam (start/end) location on closed curves.

Steps:

1. Select one or more closed curves.

   The seam point of each closed curve is indicated with a point. Each seam point is connected with a tracking line. Arrows indicate the direction of each curve.

2. Adjust the curve seams.

CurveBoolean

Trims, splits, and joins curves based on their overlapping regions.

Steps:

1. Select two or more curves.

2. Click inside the areas you want to keep.

   Click an area again to remove it.

   The region that will be retained highlights.

   A planar curve is created around the chosen region.

Options

DeleteInput

None

Deletes no input curves.

All

Deletes all input curves.

Used

Deletes only the parts of the input curves that correspond to the newly-created curves.

CombineRegions

If Yes, the selected regions append to the previously edited regions.

InsertLineIntoCrv

Straightens a curve between selected locations.

Steps:

1. Select a curve.

2. Pick the start of the straight segment on the curve.

3. Pick the end of the straight segment.

   A straight line replaces part of the curve, and the parts join together.

HBar

Edit a curve or surface with Bézier curve style handlebars.

Steps: for curves

1. Select a curve.

2. Click and drag the handlebar grips to move it around.

3. Click near the object to move the handlebar to the marker position.

4. Press Enter to end the command.

Steps: for surfaces

1. Select a surface.

2. Click and drag one of the handlebar grips to move it around.

   Press and hold the Alt key to drag points on the surface in the surface normal direction.

3. Click near the object to move the handlebar to the marker position.

4. Press Enter to end the command.

Options

Tangents

If Yes, the tangent and normal grips are shown with the grip on the surface.

AlignProfiles

Lines up and adjusts the length of one curve to another based on their bounding boxes.

Steps:

1. Select the curve to align to.

2. Select the curve to change.

   The curve will be translated and scaled so that its bounding box aligns with that of the first curve.

   The curves must be planar, and both of the planes must be parallel to a world construction plane: World Top, World Front, or World Right.

   The translation and rescaling is in the world axis directions.

SoftEditCrv

Moves the curve area surrounding a selected point smoothly relative to the distance from selected point.

Editing is done by moving the selected point. This location on the curve is moved, and the move is smoothly tapered off with increasing distance along the curve from this point.

Use this command to fine-tune curves with many control points.

The command takes over the moving of the control points so that the curve stays smooth. This is difficult on curves that are very dense. The falloff distance is adjustable, allowing the changes made to the curve to be more or less local.

Steps:

1. Select a curve.

2. Pick a point on the curve.

3. Pick a point to move to.

4. Press Enter to end the command.

Notes

• The selection point snaps to the closest edit point.

• Corresponding control points of the curve/surface are moved.

Options

Distance

The distance, in model units, along the curve from the editing point over which the strength of the editing falls off smoothly.

Copy

FixEnds

Keeps the position of the curve ends fixed.

No

If the Distance setting is larger than the distance to one or both ends of the curve, the end of the curve will be allowed to move.

Yes

If the Distance setting is larger than the distance to one or both ends of the curve, the end of the curve will not be allowed to move.

All control points are moved as they would be according to the normal falloff except the end control points. This can lead to an abrupt change in the curve near the end on dense curves.

FixedLengthCrvEdit

Allows editing a curve without changing its length.

There is no other way to maintain length while editing a NURBS curve. They are infinitely stretchy.

Steps:

1. Select a curve.

2. Pick a point on the curve.

3. Pick a point to move to.

4. Press Enter to end the command.

Options

Copy