private static Autodesk.DesignScript.Geometry.Curve Convert(Autodesk.Revit.DB.NurbSpline crv)
{
var convert = NurbsCurve.ByControlPointsWeightsKnots(crv.CtrlPoints.Select(x => x.ToPoint()).ToArray(),
crv.Weights.Cast <double>().ToArray(), crv.Knots.Cast <double>().ToArray(), crv.Degree);
if (!crv.IsBound)
{
return(convert);
}
// bound the curve parametric range
// we first get the full parametric domain from the knots
// note that some knots be negative and the domain may appear reversed
var parms = crv.Knots.Cast <double>().ToList();
var fsp = parms.First();
var fep = parms.Last();
// obtain the full domain
var fd = Math.Abs(fsp - fep);
// these are the start and end parameters of the bound curve
var sp = crv.get_EndParameter(0);
var ep = crv.get_EndParameter(1);
// get the normalized parameters for trim
var nsp = Math.Abs(fsp - sp) / fd;
var nep = Math.Abs(fsp - ep) / fd;
return(convert.ParameterTrim(nsp, nep));
}
/// <summary>
/// Convert a Revit HermiteSpline exactly to a NurbsCurve equivalent
/// </summary>
/// <param name="crv"></param>
/// <returns></returns>
public static NurbsCurve ConvertExact(Autodesk.Revit.DB.HermiteSpline crv)
{
var knots = Clamp(crv.Parameters.Cast <double>());
var points = GetNurbsPoints(crv, knots);
// the resultant nurbs curve is not rational - i.e. it's weights are 1
var weights = Enumerable.Repeat(1.0, points.Length).ToArray();
return(NurbsCurve.ByControlPointsWeightsKnots(points, weights, knots, 3));
}
public NurbsCurve CurveToNative(Curve curve)
{
var points = ArrayToPointList(curve.points, curve.units);
var dsKnots = curve.knots;
NurbsCurve nurbsCurve = NurbsCurve.ByControlPointsWeightsKnots(
points,
curve.weights.ToArray(),
dsKnots.ToArray(),
curve.degree
);
return(nurbsCurve.SetDynamoProperties <NurbsCurve>(GetDynamicMembersFromBase(curve)));
}
public static NurbsCurve ToNative(this SpeckleCurve curve)
{
var points = curve.Points.ToPoints();
var dsKnots = curve.Knots;
dsKnots.Insert(0, dsKnots.First());
dsKnots.Add(dsKnots.Last());
NurbsCurve nurbsCurve = NurbsCurve.ByControlPointsWeightsKnots(
points,
curve.Weights.ToArray(),
dsKnots.ToArray(),
curve.Degree
);
return(nurbsCurve.SetSpeckleProperties <NurbsCurve>(curve.Properties));
}
internal static Curve CurveFromMfnNurbsCurveFromDag(MDagPath dagPath, MSpace.Space space)
{
Point3DCollection controlVertices;
List <double> weights, knots;
int degree;
bool closed, rational;
decomposeMayaCurve(dagPath, space, out controlVertices, out weights, out knots, out degree, out closed,
out rational);
// var controlPoints = new List<Point>(controlVertices.Count);
var curvePoints = new PointList(controlVertices.Count);
if (MGlobal.isYAxisUp)
{
curvePoints.AddRange(controlVertices.Select(cv => Point.ByCoordinates(cv.X, -cv.Z, cv.Y)));
}
else
{
curvePoints.AddRange(controlVertices.Select(cv => Point.ByCoordinates(cv.X, cv.Y, cv.Z)));
}
Curve theCurve;
if (closed)
{
theCurve = NurbsCurve.ByControlPoints(curvePoints, degree, true);
}
else
{
theCurve = NurbsCurve.ByControlPointsWeightsKnots(curvePoints, weights.ToArray(), knots.ToArray(),
degree);
}
curvePoints.Dispose();
return(theCurve);
}
private static NurbsCurve ElevateBezierDegreeBy1(NurbsCurve crv)
{
var cpts = crv.ControlPoints();
var n = crv.Degree + 1;
var cptsFinal = new List <Point>();
cptsFinal.Add(cpts.First());
for (var i = 1; i < cpts.Length; i++)
{
cptsFinal.Add(Interp(cpts[i - 1], cpts[i], (double)i / n));
}
cptsFinal.Add(cpts.Last());
var oldKnots = crv.Knots();
var knots = HermiteToNurbs.Clamp(new[] { oldKnots.First(), oldKnots.Last() }, n);
var weights = Enumerable.Repeat(1.0, cptsFinal.Count).ToArray();
return(NurbsCurve.ByControlPointsWeightsKnots(cptsFinal, weights, knots, n));
}
