2D B-Spline Curve Edit Mode

Opens a closed curve.

Closes an open curve.

Makes the active point the first point of a closed curve. The functions s, t, T, and move multiple point's functions may affect the wrong half of the curve. Moving the control point to a different part of the curve can cure this problem.

Rotates several control points simultaneously around a given point. Select the first and last points to be rotated with the left mouse button, then locate the position of the center point of rotation, which does not have to be on a control point.

Duplicates or triples all the control points of a curve, like the function c for individual points, or makes all the control points single.

Replaces all double and triple control points with a circular arc rounding in the same way as function r does.

Changes the number of control points used to define a curve. Note: Changing the number of control points usually changes the shape of the curve.

Doubles the number of control points used to define a curve without changing the shape of the curve.

Alters the scale of the viewing window in the same way as Display=>Zoom function in main mode.

Returns the viewing window to what it was when editing was begun.

Erases the screen and redraws the contents. This may be needed to clean up the display after graphical moving.

Displays and hides the knot points. The knot points determine the positions of the cross-sections for the command BUILDÞCreate:Surface.

Changes the curve back to the size it had when editing was begun. This may be useful when editing cross-sections for building a surface, to keep them in the scales forced by the projection curves.

Computes the volume of a surface that would be created by rotating the edited curve around the vertical axis. If the curve does not touch the axis then the volume is calculated as the end of the curve was projected onto the axis.

2D Bézier Curve Edit Mode

Opens a closed curve.

Closes an open curve.

Makes the active point the first point of a closed curve. The functions s, t, T, and move multiple point's functions may affect the wrong half of the curve. Moving the control point to a different part of the curve can cure this problem.

Rotates several control points simultaneously around a given point. Select the first and last points to be rotated with the left mouse button, then locate the position of the center point of rotation, which does not have to be on a control point.

Duplicates or triples all the control points of a curve, like the function c for individual points, or makes all the control points single.

Replaces all double and triple control points with a circular arc rounding in the same way as function r does.

All corner points become smooth.

Doubles the number of control points used to define a curve without changing the shape of the curve.

Alters the scale of the viewing window in the same way as Display=>Zoom function in main mode.

Returns the viewing window to what it was when editing was begun.

Erases the screen and redraws the contents. This may be needed to clean up the display after graphical moving.

Displays and hides the knot points. The knot points determine the positions of the cross-sections for the command BUILDÞCreate:Surface.

Changes the curve back to the size it had when editing was begun. This may be useful when editing cross-sections for building a surface, to keep them in the scales forced by the projection curves.

Computes the volume of a surface that would be created by rotating the edited curve around the vertical axis. If the curve does not touch the axis then the volume is calculated as the end of the curve was projected onto the axis.