public static Rhino.Commands.Result IntersectCurves(Rhino.RhinoDoc doc)
{
// Select two curves to intersect
var go = new Rhino.Input.Custom.GetObject();
go.SetCommandPrompt("Select two curves");
go.GeometryFilter = Rhino.DocObjects.ObjectType.Curve;
go.GetMultiple(2, 2);
if (go.CommandResult() != Rhino.Commands.Result.Success)
return go.CommandResult();
// Validate input
var curveA = go.Object(0).Curve();
var curveB = go.Object(1).Curve();
if (curveA == null || curveB == null)
return Rhino.Commands.Result.Failure;
// Calculate the intersection
const double intersection_tolerance = 0.001;
const double overlap_tolerance = 0.0;
var events = Rhino.Geometry.Intersect.Intersection.CurveCurve(curveA, curveB, intersection_tolerance, overlap_tolerance);
// Process the results
if (events != null)
{
for (int i = 0; i < events.Count; i++)
{
var ccx_event = events[i];
doc.Objects.AddPoint(ccx_event.PointA);
if (ccx_event.PointA.DistanceTo(ccx_event.PointB) > double.Epsilon)
{
doc.Objects.AddPoint(ccx_event.PointB);
doc.Objects.AddLine(ccx_event.PointA, ccx_event.PointB);
}
}
doc.Views.Redraw();
}
return Rhino.Commands.Result.Success;
}
https://developer.rhino3d.com/samples/rhinocommon/calculate-curve-intersections/
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