Rebuild
Toolbar  Menu 


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

Select the curves or surfaces.
Or, press Ctrl (CMD) + Shift to select a polycurve segment.
Curves and extrusion objects
To rebuild curves
 Click Preview to see what the rebuilt curves will look like.
 When you are satisfied with the results, click OK.
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.
History is supported when Delete Input is unchecked.
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.
Make SubD friendly
Makes the output curve compatible with SubD. Details...
When this option is enabled, the Degree option is disabled. The output curve can only be degree 3.
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.
Displays a preview of the output.
If you change the settings, click the
button again to refresh the display.To access hidden commandline options
 Type a hyphen in front of the command name: Rebuild.
Commandline options  

Type subcrv to select part of a curve as input. 
Surfaces
To rebuild surfaces
 Click Preview to see what the rebuilt surfaces will look like.
 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.
The calculation tests how far away the new surface is at knot line intersections and halfway 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.
Displays a preview of the output.
If you change the settings, click the
button again to refresh the display.Toolbar  Menu 



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.
Steps
 Select surfaces to rebuild.
Commandline options  

Direction 
Specify the u, v, or both directions. 
PointCount 
Specifies the number of control points in the result. 
Type 
LooseThe 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. NormalThe 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 sectionsCreates a ruled surface. The sections between the curves are straight. TightThe surface closely follows the original. This is a good choice when the input curves are going around a corner. UniformMakes the object knot vectors uniform. 
DeleteInput 
YesDeletes the original geometry. NoRetains the original geometry. 
CurrentLayer 
The output will be on the current layer. 
Trims the rebuilt surface with the original trimming curves. 
Toolbar  Menu 



The RebuildCrvNonUniform command interactively modifies selected curves by nonuniformly respacing the control points.
Steps
 Select the curves.
 Drag the points on the curves.
 Click the direction arrows to reverse the curve direction.
Commandline 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 
YesDeletes the original geometry. NoRetains the original geometry. 
ResetPoints 
Resets the editing points to their original locations. 
Type subcrv to select part of a curve as input. 