Project: HiCAD 3-D

Freehand B-Spline

Sketch > Draw > Freehand

You use this function to draw a "freehand" B-spline by using the cursor to define a sequence of points. The B-spline is interpolated by means of these points.

Specify the start point of the spline.
Define the next points.
Use the right mouse button to end the creation of the B spline.

If the start and end points of a B-spline are identical, the two are joined tangentially.

Clicking opens a menu with further functions:

	Cubic spline	Derives cubic splines.
	Cubic spline, tangential	Derives tangential cubic splines.
	Akima spline	Derives Akima splines.
	B-spline, NURBS	Derives B-splines and NURBS.
	Spirals*	Derives spirals.
	Transition curve	Automatic creation of a curve (Hermite spline) with moderated curvature between 2 points.
	Curve from FFS	Applies parametric or boundary lines of a freeform surface as a curve.
	CONS from polyline	Derives surface curves.
	C-edge->NURBS	Converts elements of a 3-D sketch to a NURBS curve.
	Vector equation	Definition of 3-D polylines via vector equations. The support points are connected by lines.
	Circular vector equation	Definition of 3-D polylines via vector equations. The support points are connected by circular arcs.
	Smooth c-edge	Smoothes elements of a 3-D sketch.

* only for 3-D sketches

If you use theHCM (Parametrics) functions, you can modify curve elements with the dragger. Select Sketch > HCM > Fix... > Spline property to specify the behaviour of the curve during dragging. The following options are possible:

Rigid

The curve can only be moved with the dragger.

Flexible

The curve can be changed dynamically with the cursor.

Scalable

The curve can be moved, rotated and scaled with the dragger.

3-D Sketch (3-D) • Sketch Functions (3-D)

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