Replies to This Discussion

Permalink Reply by Dale Fugier on March 6, 2013 at 9:13am

Hi Simon,

If you use Rhino's Sweep2 command, can you rebuild the shape with 4 control points?

Can you post the geometry?

Thanks,

 -- Dale

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Permalink Reply by Simon Zhou on March 6, 2013 at 4:32pm

Hi Dale,

 

Rhino's Sweep2 command works well.

The test code as below,Please help to check.

 

Thanks,

Simon

 

private List<Brep> Sweep2(Curve Rail1, Curve Rail2, List<Curve> shape_curves, int m_rebuild_count)
        {
           // if (!Rhino.Geometry.Curve.DoDirectionsMatch(Rail1, Rail2))
            //    Rail2.Reverse();
            Rhino.Geometry.SweepTwoRail sweep = new Rhino.Geometry.SweepTwoRail();
            RhinoDoc doc = RhinoDoc.ActiveDoc;

            sweep.AngleToleranceRadians = doc.ModelAngleToleranceRadians;
            sweep.ClosedSweep = Rail1.IsClosed & Rail2.IsClosed;
            sweep.SweepTolerance = doc.ModelAbsoluteTolerance;
            sweep.MaintainHeight = true;
            var breps = sweep.PerformSweepRebuild(Rail1, Rail2, shape_curves, m_rebuild_count);
            return  new List<Brep>(breps);
        }

        protected override Result RunCommand(RhinoDoc doc, RunMode mode)
        {
            doc.Objects.UnselectAll();
            Rhino.DocObjects.ObjRef rail1_ref;
            var rc = RhinoGet.GetOneObject("Select rail curve1", false, Rhino.DocObjects.ObjectType.Curve, out rail1_ref);
            if (rc != Rhino.Commands.Result.Success)
                return rc;

            var rail1_crv = rail1_ref.Curve();
            if (rail1_crv == null)
                return Rhino.Commands.Result.Failure;
            doc.Objects.UnselectAll();
            Rhino.DocObjects.ObjRef rail2_ref;
             rc = RhinoGet.GetOneObject("Select rail curve2", false, Rhino.DocObjects.ObjectType.Curve, out rail2_ref);
            if (rc != Rhino.Commands.Result.Success)
                return rc;

            var rail2_crv = rail2_ref.Curve();
            if (rail2_crv == null)
                return Rhino.Commands.Result.Failure;

            if (!Rhino.Geometry.Curve.DoDirectionsMatch(rail1_crv, rail2_crv))
                rail2_crv.Reverse();

            Line line1 = new Line(rail1_crv.PointAtStart, rail2_crv.PointAtStart  );
            Line line2 = new Line(rail1_crv.PointAtEnd, rail2_crv.PointAtEnd );

            List<Curve> sectionLine  =new List<Curve> ();
            sectionLine.Add(line1.ToNurbsCurve());
            sectionLine.Add(line2.ToNurbsCurve());

            List<Brep> breps=Sweep2(rail1_crv, rail2_crv, sectionLine, 5);
            foreach (Brep brep in breps)
            {
                doc.Objects.AddBrep(brep);
            }

          
            doc.Views.Redraw();
           
            return Result.Success;
        }

Attachments:

• test.3dm, 23 KB

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Permalink Reply by Dale Fugier on March 7, 2013 at 10:49am

Hi Simon,

Thank you for posting your geometry. With it, I was able to track down a bug in Rhino that was causing the shape curves to not rebuild. I have fixed the problem in Rhino. But it is too late for the fix to make it into Rhino 5 SR2. So, look for the fix when Rhino 5 SR3 is available.

Thanks again.

 -- Dale

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Permalink Reply by Simon Zhou on March 8, 2013 at 6:33pm

Hi Dale,

 

I'm looking forward to the Rhino 5 SR3 can release earlier.

Is there any other way to replace PerformSweepRebuild function in RhinoCommon?

 

Thanks,

Simon

 

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Permalink Reply by Simon Zhou on March 11, 2013 at 12:22am

Hi Dale,

 

If no way to replace PerformSweepRebuild function,can you tell me how to get the count of control point in U direction? 

 

Thanks,

Simon

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Permalink Reply by Dale Fugier on March 11, 2013 at 10:00am

SweepOneRail.PerformSweepRebuild returns an array of Breps. You'd have to:

1. Get a Brep from the results
2. Get a BrepFace from the Brep.
3. Get the face's underlying surface.
4. Make sure the surface is a NURBS surface.
5. Get the NURBS surface's point count in the U direction.

Let me know if you need an example.

 -- Dale

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Permalink Reply by Dale Fugier on March 11, 2013 at 9:56am

The only work around, until SR3, is to script the Sweep1 command using Rhino.RhinoApp.RunScript.

 -- Dale

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