Sweep 1 Rail
Crease splitting enabled
The Sweep1 command fits a surface through a series of profile curves that define the surface cross-sections and one curve that defines a surface edge.
Select connected edge/curve segments based on the continuity between segments.
Creates a surface that begins or ends at a point.
Adjust seam options (Closed curves only)
Reverses the curve direction.
Attempts to align the seam points and directions without intervention.
Moves the seam points to the way they were at the beginning of the command.
The seam points are always at the knots. You can only move them among the knots.
The seam points may leave the knots. You can move them without restriction.
Select each seam point and move it along the curve to line up all curve seams.
Use the Flip option to make all seam arrows point to the same side.
Press Enter to continue.
Sweep 1 Rail Options
A frame is a 3-D point and three direction vectors. It can be drawn as something that looks like the Rhino world axes icon. It describes a unique coordinate system in space. Frames are calculated along the rail and are used to orient the cross-section curves at those locations. In a simple case with one cross-section, frames are made at the cross-section curve location and where the calculated cross-section is going to go. The 3-D rotation between those two frames determines the rotation of the cross-section curve at its new location.
Freefrom is the default Frame style. The selected Frame style will be remembered in the current Rhino for next use.
The cross-section curve rotates to maintain its angle to the rail throughout the sweep.
Specify an axis for calculating the 3-D rotation of the cross-section.
The default Roadlike axis will be different depending on the rail curve. For a planar rail curve, the default axis is perpendicular to the curve plane. For a non-planar rail curve, world-Z axis will be used.
Sets the axis direction for the Roadlike style.
If the rail is a surface edge, the cross-section curve will twist with the surface edge. If the shapes are tangent to the surface, the new surface should also be tangent.
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.
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.
If the sweep creates a polysurface with kinks, the component surfaces will be untrimmed.
Refits the rail curve before creating the sweep.
Allows reversing the direction of the cross-section curves.
Creates the sweep without altering the cross-section curves.
Refits the cross-section curves before creating the sweep.
To determine the movement of a cross-section, one frame is found at an existing cross-section location and another is calculated at the desired location along the rail. The difference between those frames defines the movement of the cross-section.
The frames are found like this:
If the rail tangent and the arbitrary vector are parallel, they do not define a plane and the cross product does not produce a vector, so the frame is under-defined, and it will twist around the rail tangent since that is the only defined information.
Fit a surface through profile curves and two edge curves.
The SubDSweep1 command sweeps a shape curve along a rail curve to create a SubD.
The SubDSweep2 command sweeps a shape curve along two rail curves to create a SubD.
Fit a surface through profile curves that define the surface shape.
Fit a surface through a network of crossing curves.
Rhinoceros 7 © 2010-2022 Robert McNeel & Associates. 25-May-2022