Rebuild

Toolbar Menu

Curve Tools

Surface Tools

Edit

Rebuild

The Rebuild command reconstructs selected curves or surfaces to a specified degree and control point number.

Steps

Curves and extrusion objects

To rebuild curves

  1. Click Preview to see what the rebuilt curves will look like.
  2. When you are satisfied with the results, click OK.

Note

Rebuild options

Point count

Reports in parentheses the current number and sets the number of control points in the result.

Degree

Reports in parentheses the current number and sets the degree of the curve. Degree in Rhino can be up to 11.

Point count and Degree values change automatically to fulfill the minimum requirement of Point count = Degree + 1. For example, when Point count=4 and Degree=3, reducing Point count also reduces Degree; increasing Degree also increases Point count. In closed curves/surfaces, the start and end points are overlapped and counted as one. They have one less point than open curves/surfaces.

DeleteInput

Deletes the original geometry.

Create new object on current layer

Creates the new objects on the current layer. Clear this check box to place the new objects on the layer of the original curves.

Preserve end tangent directions

The new curve matches the input curve end tangents if the curve is open, the degree is two or more, and the point count is four or more.

Select Master Curve

Rebuild a curve to match another curve's parameter structure.

The Loft, Sweep1 and Sweep2 commands create a better surface from section curves with the same parameter structure.

Span counts

Reports in parentheses the minimum number of spans and the proposed number of spans.

Maximum deviation

Reports the maximum deviation from the original curve when Preview is clicked.

Preview

Displays a preview of the output.

If you change the settings, click the Preview button again to refresh the display.

To access hidden command-line options

Command-line options

SubCrv

Type subcrv to select part of a curve as input.

Surfaces

To rebuild surfaces

  1. Click Preview to see what the rebuilt surfaces will look like.
  2. When you are satisfied with the results, click OK.

Rebuild Surface Options

Point count

U

Reports in parentheses the current number and sets the number of points in the u direction.

V

Reports in parentheses the current number and sets the number of points in the v direction.

Degree

U

Reports in parentheses the current number and sets the degree in the u direction.

V

Reports in parentheses the current number and sets the degree in the v direction.

Point count and Degree values change automatically to fulfill the minimum requirement of Point count = Degree + 1. For example, when Point count=4 and Degree=3, reducing Point count also reduces Degree; increasing Degree also increases Point count. In closed curves/surfaces, the start and end points are overlapped and counted as one. They have one less point than open curves/surfaces.

Options

DeleteInput

Deletes the original geometry.

Current Layer

Creates the new surfaces on the current layer. Clear this checkbox to place the new surfaces on the layer of the original surfaces.

Retrim

Trims the rebuilt surface with the original trimming curves.

Span counts

U

Reports in parentheses the minimum number of spans and the proposed number of spans in the u direction.

V

Reports in parentheses the minimum number of spans and the proposed number of spans in the v direction.

Maximum deviation

Reports the maximum deviation from the original surface.

Calculate

The calculation tests how far away the new surface is at knot line intersections and half-way between knot lines. Conducts tests at knot line intersections and halfway between knot lines.

The display color indicates how far away the new surface is from the original. Points are green if the surface is within absolute tolerance, yellow if it is between tolerance and 10 times tolerance, and red if it is farther away than that.

Preview

Displays a preview of the output.

If you change the settings, click the Preview button again to refresh the display.

RebuildUV

Toolbar Menu

Surface Tools

Not on menus.

The RebuildUV command reconstructs selected surfaces to a specified control point number in either the u or v directions independently.

Steps

Command-line options

Direction
(Surfaces only)

Specify the u, v, or both directions.

PointCount

Specifies the number of control points in the result.

Type

Loose

The surface control points are created at the same locations as the control points of the original. This is a good option if the control points will be edited later.

Normal

The surface has an average amount of stretching between the curves. This is a good choice when the curves are proceeding in a relatively straight path or there is a lot of space between the curves.

Straight sections

Creates a ruled surface. The sections between the curves are straight.

Tight

The surface closely follows the original. This is a good choice when the input curves are going around a corner.

Uniform

Makes the object knot vectors uniform.

DeleteInput

Yes

Deletes the original geometry.

No

Retains the original geometry.

CurrentLayer

The output will be on the current layer.

RebuildCrvNonUniform

Toolbar Menu

Curve Tools

Not on menus.

The RebuildCrvNonUniform command interactively modifies selected curves by non-uniformly re-spacing the control points.

Steps

  1. Select the curves.
  2. Drag the points on the curves.
  3. Click the direction arrows to reverse the curve direction.
Command-line options

RequestedTolerance

Specifies the maximum distance the rebuilt curves can deviate from the originals. If you do not provide enough control points, the rebuilt curves may deviate more than RequestedTolerance from the originals.

The maximum deviation from the original curves is reported at the command line and marked with a point on the curve.

MaxPointCount

Specifies the maximum number of control points per curve used to rebuild.

Quarters

Displays two more controls along each curve to influence how the RebuildCrvNonUniform command distributes control points. The controls at the end of the curves can be used to shorten the resulting curves.

DeleteInput

Yes

Deletes the original geometry.

No

Retains the original geometry.

ResetPoints

Resets the editing points to their original locations.

SubCrv

Type subcrv to select part of a curve as input.

See also

Edit surfaces

 

 

 

Rhinoceros 6 © 2010-2019 Robert McNeel & Associates. 16-May-2019