/// <summary>
/// Convert a Nucleus Linear Element to a Rhino Extrusion, if possible
/// </summary>
/// <param name="element"></param>
/// <returns></returns>
public static RC.Extrusion ConvertToExtrusion(LinearElement element)
{
Curve perimeter = element?.Family?.Profile?.Perimeter;
CurveCollection voids = element?.Family?.Profile?.Voids;
if (perimeter != null && element.Geometry != null)
{
RC.Curve profile = Convert(perimeter);
var cSystem = element.Geometry.LocalCoordinateSystem(0, element.Orientation);
if (element.Geometry is Line)
{
//If a line, create an extrusion:
RC.Extrusion ext = new RC.Extrusion();
ext.SetPathAndUp(
Convert(element.Geometry.EndPoint), Convert(element.Geometry.StartPoint),
ConvertVector(cSystem.Z));
ext.SetOuterProfile(profile, true);
if (voids != null)
{
var voidCrvs = Convert(voids);
foreach (var rCrv in voidCrvs)
{
ext.AddInnerProfile(rCrv);
}
}
//RC.Surface surface = RC.Extrusion.CreateExtrusion(profile, new RC.Vector3d(Convert(element.End.Position - element.Start.Position)));
return(ext);
}
}
return(null);
}
/// <summary>
/// Convert a Nucleus extrusion volume to a Rhino one
/// </summary>
/// <param name="extrusion"></param>
/// <returns></returns>
public static RC.Extrusion Convert(Extrusion extrusion)
{
if (extrusion.IsValid)
{
Curve perimeter = extrusion.Profile?.Perimeter;
CurveCollection voids = extrusion.Profile?.Voids;
if (perimeter != null)
{
RC.Curve profile = Convert(perimeter);
// var cSystem = new CartesianCoordinateSystem(new Vector(), extrusion.Path);
//If a line, create an extrusion:
RC.Extrusion ext = new RC.Extrusion();
ext.SetPathAndUp(new RC.Point3d(0, 0, 0), Convert(extrusion.Path), RC.Vector3d.YAxis); //TODO: Test!
//ConvertVector(cSystem.Z));
ext.SetOuterProfile(profile, true);
if (voids != null)
{
var voidCrvs = Convert(voids);
foreach (var rCrv in voidCrvs)
{
ext.AddInnerProfile(rCrv);
}
}
//RC.Surface surface = RC.Extrusion.CreateExtrusion(profile, new RC.Vector3d(Convert(element.End.Position - element.Start.Position)));
return(ext);
}
}
return(null);
}
public static bool TryGetExtrusion(this Surface surface, out Extrusion extrusion)
{
extrusion = null;
var nurbsSurface = surface as NurbsSurface ?? surface.ToNurbsSurface();
for (int direction = 1; direction >= 0; --direction)
{
var oposite = direction == 0 ? 1 : 0;
if (surface.IsClosed(direction))
{
continue;
}
var domain = nurbsSurface.Domain(direction);
var iso0 = nurbsSurface.IsoCurve(oposite, domain.Min);
var iso1 = nurbsSurface.IsoCurve(oposite, domain.Max);
if (iso0.TryGetPlane(out var plane0) && iso1.TryGetPlane(out var plane1))
{
if (plane0.Normal.IsParallelTo(plane1.Normal, RhinoMath.DefaultAngleTolerance / 100.0) == 1)
{
var rowCount = direction == 0 ? nurbsSurface.Points.CountU : nurbsSurface.Points.CountV;
var columnCount = direction == 0 ? nurbsSurface.Points.CountV : nurbsSurface.Points.CountU;
for (int c = 0; c < columnCount; ++c)
{
var point = direction == 0 ? nurbsSurface.Points.GetControlPoint(0, c) : nurbsSurface.Points.GetControlPoint(c, 0);
for (int r = 1; r < rowCount; ++r)
{
var pointR = direction == 0 ? nurbsSurface.Points.GetControlPoint(r, c) : nurbsSurface.Points.GetControlPoint(c, r);
var projectedPointR = plane0.ClosestPoint(pointR.Location);
if (projectedPointR.DistanceToSquared(point.Location) > RhinoMath.SqrtEpsilon)
{
return(false);
}
if (Math.Abs(pointR.Weight - point.Weight) > RhinoMath.ZeroTolerance)
{
return(false);
}
}
}
// Extrusion.Create does not work well when 'iso0' is a line-like curve,
// plane used to extrude is "arbitrary" in this case
//extrusion = Extrusion.Create(iso0, zAxis.Length, false);
var axis = new Line(iso0.PointAtStart, iso1.PointAtStart);
var zAxis = iso1.PointAtStart - iso0.PointAtStart;
var xAxis = (iso0.IsClosed ? iso0.PointAt(iso0.Domain.Mid) : iso0.PointAtEnd) - iso0.PointAtStart;
var yAxis = Vector3d.CrossProduct(zAxis, xAxis);
extrusion = new Extrusion();
if (!iso0.Transform(Transform.PlaneToPlane(new Plane(iso0.PointAtStart, xAxis, yAxis), Plane.WorldXY)))
{
return(false);
}
return(extrusion.SetPathAndUp(axis.From, axis.To, yAxis) && extrusion.SetOuterProfile(iso0, false));
}
}
}
return(false);
}