Rebuild

Toolbar	Menu
Curve Tools Surface Tools	Edit Rebuild

 History enabled

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

Curves and extrusion objects

Note

• Turn on control points and curvature graph to see the details of the curve structure.
• A group of curves will be rebuilt with curves of a specified degree and specified number of control points. The knot of the resulting curve more evenly spaced. To rebuild a curve with uneven knot spacing but a more accurate fit, use the FitCrv command.

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.

Delete Input

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 SubD friendly state of the master curve will be ignored.

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.

Command-line options
SubCrv	Type subcrv to select part of a curve as input.

Surfaces

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.

Toolbar	Menu
Surface Tools	Not on menus.

The RebuildUV command reconstructs selected surfaces to degree 3, with a specified control point number, in either the u or v direction. The surface structure in the other direction is left unchanged.

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.
ReTrim	Trims the rebuilt surface with the original trimming curves.

Toolbar	Menu
Curve Tools	Not on menus.

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

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