private static Autodesk.DesignScript.Geometry.Helix Convert(Autodesk.Revit.DB.CylindricalHelix crv)
{
if (crv.IsRightHanded)
{
// a negative pitch and axis vector produces helix in opposite direction
return(Autodesk.DesignScript.Geometry.Helix.ByAxis(crv.BasePoint.ToPoint(), (-1.0 * crv.ZVector).ToVector(),
crv.GetEndPoint(0).ToPoint(), -crv.Pitch, (crv.Height / crv.Pitch) * 360.0));
}
// clockwise is default
return(Autodesk.DesignScript.Geometry.Helix.ByAxis(crv.BasePoint.ToPoint(), crv.ZVector.ToVector(),
crv.GetEndPoint(0).ToPoint(), crv.Pitch, (crv.Height / crv.Pitch) * 360.0));
}
public static NurbsCurve ToRhino(DB.CylindricalHelix helix)
{
var nurbsCurve = NurbsCurve.CreateSpiral
(
AsPoint3d(helix.BasePoint),
AsVector3d(helix.ZVector),
AsPoint3d(helix.BasePoint) + AsVector3d(helix.XVector),
helix.Pitch,
helix.IsRightHanded ? +1 : -1,
helix.Radius,
helix.Radius
);
nurbsCurve.Domain = new Interval(helix.GetEndParameter(0), helix.GetEndParameter(1));
return(nurbsCurve);
}
public static Curve ToCurve(this DB.CylindricalHelix value)
{
var rhino = RawDecoder.ToRhino(value); UnitConverter.Scale(rhino, UnitConverter.ToRhinoUnits); return(rhino);
}
public static NurbsCurve ToRhino(this DB.CylindricalHelix helix) => RawDecoder.ToRhino(helix);
