NurbsCurveCreateSpiral Method (Curve, Double, Double, Point3d, Double, Double, Double, Double, Int32)

public static NurbsCurve CreateSpiral(
	Curve railCurve,
	double t0,
	double t1,
	Point3d radiusPoint,
	double pitch,
	double turnCount,
	double radius0,
	double radius1,
	int pointsPerTurn
)

Public Shared Function CreateSpiral ( 
	railCurve As Curve,
	t0 As Double,
	t1 As Double,
	radiusPoint As Point3d,
	pitch As Double,
	turnCount As Double,
	radius0 As Double,
	radius1 As Double,
	pointsPerTurn As Integer
) As NurbsCurve

Parameters

railCurve

Type: Rhino.GeometryCurve
The rail curve.

t0

Type: SystemDouble
Starting portion of rail curve's domain to sweep along.

t1

Type: SystemDouble
Ending portion of rail curve's domain to sweep along.

radiusPoint

Type: Rhino.GeometryPoint3d
Point used only to get a vector that is perpedicular to the axis. In particular, this vector must not be (anti)parallel to the axis vector.

pitch

Type: SystemDouble
The pitch. Positive values produce counter-clockwise orientation, negative values produce clockwise orientation.

turnCount

Type: SystemDouble
The turn count. If != 0, then the resulting helix will have this many turns. If = 0, then pitch must be != 0 and the approximate distance between turns will be set to pitch. Positive values produce counter-clockwise orientation, negitive values produce clockwise orientation.

radius0

Type: SystemDouble
The starting radius. At least one radii must benonzero. Negative values are allowed.

radius1

Type: SystemDouble
The ending radius. At least ont radii must be nonzero. Negative values are allowed.

pointsPerTurn

Type: SystemInt32
Number of points to intepolate per turn. Must be greater than 4. When in doubt, use 12.

Return Value

Rhino for Mac

Rhino for Windows

Reference