Topic: Getting subentity vertex points of solid in AutoCAD

[Smirzor]

I am trying to find the vertex points of a swept polyline. So i have a solid that was created by sweeping a circle along a 3D polyline. It looks like that:


Googeling the whole of friday last week i think i have to play around with the subentity part. I found out how to change the color of the subentity edges for instance, but couldnt for christs sake not find out how to access the geometric

This is what i tried out so far, but as i noted right at the bottom i am kinda lost there. (or am i completly on the wrong path with subentity)

(long story short, I want to get the coordinates of the vertices of the 3D solid that was swept from a 3dpolyline by using a circle)

Code: [Select]

    [CommandMethod("SubEntExample")]
    public void SubEntExample()
    {
        Document doc = Application.DocumentManager.MdiActiveDocument;
        Database db = doc.Database;
        Editor ed = doc.Editor;

        PromptEntityOptions peo = new PromptEntityOptions("\nSelect a 3D solid: ");
        peo.SetRejectMessage("\nInvalid selection...");
        peo.AddAllowedClass(typeof(Solid3d), true);

        PromptEntityResult per = ed.GetEntity(peo);

        if (per.Status != PromptStatus.OK)
            return;

        using (Transaction Tx = db.TransactionManager.StartTransaction())
        {
            Solid3d solid = Tx.GetObject(per.ObjectId, OpenMode.ForWrite) as Solid3d;

            ObjectId[] ids = new ObjectId[] { per.ObjectId };

            FullSubentityPath path = new FullSubentityPath(ids, new SubentityId(SubentityType.Null, IntPtr.Zero));

            List<SubentityId> subEntIds = new List<SubentityId>();

            using (Autodesk.AutoCAD.BoundaryRepresentation.Brep brep =
                new Autodesk.AutoCAD.BoundaryRepresentation.Brep(path))
            {                   
                foreach (Autodesk.AutoCAD.BoundaryRepresentation.Edge edge in brep.Edges)
                {
                    subEntIds.Add(edge.SubentityPath.SubentId);
                }                   
            }

            foreach (SubentityId subentId in subEntIds)
            {

                *** here i am lost ***

            }
            Tx.Commit();
        }
    }

[Bryco]

_SURFEXTRACTCURVE  gives you isolines that may be handy

[Alexander Rivilis]

IMHO I've answered to Smirzor: https://forums.autodesk.com/t5/net/getting-subentity-vertex-points-of-swept-solid/m-p/6662855#M50857

Code - C#: [Select]

1. using System;
2. using Autodesk.AutoCAD.Runtime;
3. using Autodesk.AutoCAD.ApplicationServices;
4. using Autodesk.AutoCAD.DatabaseServices;
5. using Autodesk.AutoCAD.Geometry;
6. using Autodesk.AutoCAD.EditorInput;
7. using Autodesk.AutoCAD.BoundaryRepresentation;
8.  
9. // This line is not mandatory, but improves loading performances
10. [assembly: CommandClass(typeof(GetSweepAxis.MyCommands))]
11.  
12. namespace GetSweepAxis
13. {
14.  
15.   public class MyCommands
16.   {
17.  
18.     [CommandMethod("FindCylinderAxis")]
19.     public void FindCylinderAxis()
20.     {
21.       Document doc = Application.DocumentManager.MdiActiveDocument;
22.       Editor ed = doc.Editor;
23.       PromptEntityOptions peo = new PromptEntityOptions("Pick a 3DSOLID: ");
24.       peo.SetRejectMessage("\nA 3d solid must be selected.");
25.       peo.AddAllowedClass(typeof(Autodesk.AutoCAD.DatabaseServices.Solid3d), true);
26.       PromptEntityResult per = ed.GetEntity(peo);
27.       if (per.Status != PromptStatus.OK)
28.         return;
29.  
30.       using (Transaction tr = doc.Database.TransactionManager.StartTransaction())
31.       {
32.         Solid3d sld = tr.GetObject(per.ObjectId, OpenMode.ForRead, false) as Solid3d;
33.         Point3d axisPt1 = Point3d.Origin;
34.         Point3d axisPt2 = Point3d.Origin;
35.         Point3dCollection pts = new Point3dCollection();
36.         if (GetCylinderAxis(sld, ref  pts))
37.         {
38.           for (int i = 0; i < pts.Count; i++)
39.           {
40.             ed.WriteMessage("\nPt[{0}] = {1}", i, pts[i]);
41.           }
42.         }
43.         else
44.         {
45.           ed.WriteMessage("\nNot a sweeped solid");
46.         }
47.         tr.Commit();
48.       }
49.     }
50.  
51.     private bool GetCylinderAxis(Solid3d solid, ref Point3dCollection pts)
52.     {
53.       using (Brep brep = new Brep(solid))
54.       {
55.         BrepEdgeCollection edges = brep.Edges;
56.         foreach (Edge edge in edges)
57.         {
58.           Curve3d curv = ((ExternalCurve3d)edge.Curve).NativeCurve;
59.           if (curv is CircularArc3d)
60.           {
61.             CircularArc3d circle = curv as CircularArc3d;
62.             if (!pts.Contains(circle.Center)) pts.Add(circle.Center);
63.           }
64.           else if (curv is EllipticalArc3d)
65.           {
66.             EllipticalArc3d circle = curv as EllipticalArc3d;
67.             if (!pts.Contains(circle.Center)) pts.Add(circle.Center);
68.           }
69.         }
70.       }
71.       return (pts.Count > 1) ? true : false;
72.     }
73.   }
74. }

[Bryco]

Oh that is nice

[kdub_nz]

Oh that is nice

Yes, it is , isn't it.

Thanks Alexander

[lamarn]

Any possibility to test it using a .dll file?

[Alexander Rivilis]

Any possibility to test it using a .dll file?

Sorry but I did not understand this question.