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.
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. Click the Set axis button to specify a different axis.
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.
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.
Rebuilds the cross-section curve's control points before creating the sweep.
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.
Fit a surface through profile curves that define the surface shape.
Fit a surface through a network of crossing curves.
Rhinoceros 6 © 2010-2019 Robert McNeel & Associates. 16-May-2019