Creates a surface through profile curves that define the surface shape and one curve that defines a surface edge.
Steps:
-
Select a single rail curve.
-
Select cross-section curves in the order that the surface will pass through them.
-
For closed curves, adjust the curve seams
as necessary.
-
Adjust the options.
Options
ChainEdges
Chain selects curves that meet end to end in the same way as the SelChain
command.
Press Ctrl + left mouse button to deselect a segment selected by ChainEdges.
Point
Creates a surface that begins or ends at a point, use this option only at the start or end of the curve series.
Style Options
Freeform
The shape curve rotates to maintain its angle to the rail throughout the sweep.
Roadlike
Top
The shape curve maintains its angle to the Top construction plane throughout the sweep.
Right
The shape curve maintains its angle to the Right construction plane throughout the sweep.
Front
The shape curve maintains its angle to the Front construction plane throughout the sweep.
Align with surface
If the rail is a surface edge, the shape will twist with the surface edge. If the shapes are tangent to the surface, the new surface should also be tangent.
On
Off
Creates a closed surface, continuing the surface past the last curve around to the first curve. This option is only available after you select two cross-section curves.
Global shape blending
The sweep is linearly blended from one end to the other, creating sweeps that taper from one cross-section curve to the other. Otherwise, the sweep stays constant at the ends and changes more rapidly in the middle.
On
Off
Untrimmed Miters
If the sweep creates a polysurface with kinks, the component surfaces will be untrimmed.
On
Off
Cross-section curve options
Align Shapes
Allows reversing the direction of the cross-section curves.
Do not simplify
Does nothing to the shape curves before creating the sweep.
Rebuild with
Rebuilds the shape curves control points
before creating the sweep.
Refit within
Refits the shape curves before creating the sweep. The default distance is the global tolerance value set in the Document Properties dialog box Units
page.
Preview
Click to preview the surface.
Notes
-
To create a single surface, the cross-section curves need to be compatible. If you use the Refit within option, the cross-section curves are refit with compatible cubic splines. If you do not use the Refit within option, the cross-section curves are made compatible by degree
elevation and knot
addition. (The original curves are not modified.) You can specify the fitting tolerance for the cross-section curves with the Refit within option, but the fitting tolerance for the rail curve is controlled by the Absolute tolerance
in the Unit page of the Document Properties dialog box. -
With closed rail curves, the first cross-section curve you select is added to the end of the list if you choose to create a closed surface.
-Sweep1
|
Surface > Sweep 1 Rail
Surface > Sweep 1 Rail
|
Related topics…
Creates a surface through profile curves that define the surface shape and two curves that define the surface edges.
Steps:
-
Select two curves as the rails.
-
Select cross-section curves in the order in which the surface will pass through them.
-
For closed curves, adjust the curve seams
as necessary.
-
Adjust the options.
Options
ChainEdges
Chain selects curves that meet end to end in the same way as the SelChain
command.
Press Ctrl + left mouse button to deselect a segment selected by ChainEdges.
Point
Creates a surface that begins or ends at a point. Use this option only at the start or end of the curve series.
Cross-section curve options
Do not simplify
Creates the sweep without doing anything to the shape curves.
Rebuild with control points
Rebuilds the shape curve control points
before creating the sweep. Shape curves reconstruct with non-rational curves, so as to enable the continuity option.
Refit within units
Refits the shape curves before creating the sweep. The default distance is the global tolerance value set in Document Properties dialog box Units
page. Shape curves are reconstructed with non-rational curves, so the continuity option can be enabled.
Preserve shapes
Preserve first shape
When you are matching edge tangency or curvature, your surface may pull away from your profile curves. This option forces the surface shape to match the first profile curve.
Preserve last shape
When you are matching edge tangency or curvature, your surface may pull away from your profile curves. This option forces the surface shape to match the last profile curve.
Maintain height
By default, shape curves normally scale in both the height and width dimensions. To remove the association between the height scaling from the width scaling, use the Maintain height option.
On
Off
Rail curve options
Continuity is only enabled if the rails are surface edges and the shape curves are non-rational (all control point weights are 1). Exact arcs and ellipse segments are rational.
Note: Only continuity options that the curve structure (point count and rational/non rational) supports will be available.
Creates a closed surface that continues the surface past the last curve around to the first curve. This option is only available after you select two cross-section curves.
Simple sweep
Creates surfaces using exact input. This option generates simpler surfaces in cases when the curves are perfectly set up. The surface inherits the structure of the input curves.
Note: Place more sections to do Simple Sweep. The sections must be placed at the edit points of the two rails.
On (single cross-section curve)
On (multiple cross-section curves)
Off
Add Slash
Adds additional cross-section alignments to control how the surface is created between sections.
Preview
Click to preview the surface.
Notes
-
Make the degree and structure of the rail curves match each other.
-
Place cross-section curves so the endpoints are on the ends of the rails or on edit points of the rails.
-
Turn on edit points
and use Point
object snap to place the section curves between matching edit points on the rails. -
If only one section curve is used, the entire length of the rails are used for the surface, regardless of the settings.
-
Section curves can have differing structures. The surface takes the complexity of the most complex one.
-
To use same shape curve in the whole sweep, with control over where the sweep ends, use the Orient
commands to create a scaled copy of the shape curve and place its ends at the places on the rail curves where you want the sweep to stop.
-Sweep2
|
Surface > Sweep 2 Rails
Surface > Sweep 2 Rails
|
