topic Re: Get Point Collection from 3dsolid in .NET Forum

Get Point Collection from 3dsolid

Anonymous — Wed, 29 Feb 2012 23:49:15 GMT

I know this must be an easy answer, but for the life I me I can't find the method that returns a point collection for a given 3dsoild. I have to think that a property exists that contains all the points for a solid (the ones shown when you select a 3dsolid). I appreciate the help. Thanks!

Re: Get Point Collection from 3dsolid

Alexander.Rivilis — Thu, 01 Mar 2012 06:36:10 GMT

Solution: http://through-the-interface.typepad.com/through_the_interface/2008/09/traversing-a-3d.html

Re: Get Point Collection from 3dsolid

Anonymous — Thu, 01 Mar 2012 13:39:39 GMT

Thank you for the link. I guess it wasn't quite as easy as I would have thought. I figured there would just be a property for 3dsolids that contained all the points. Never the less, I can probably get that code to work. Thanks again.

Re: Get Point Collection from 3dsolid

_gile — Sat, 03 Mar 2012 10:28:08 GMT

Hi,

If you only need the solid vertices, you don't need to run through the whole brep tree.

Here's a little sample.

        public Point3dCollection GetSolidVertices(ObjectId id)
        {
            Database db = HostApplicationServices.WorkingDatabase;
            using (Transaction tr = db.TransactionManager.StartTransaction())
            {
                Solid3d sol = tr.GetObject(id, OpenMode.ForRead) as Solid3d;
                if (sol == null) return null;
                try
                {
                    Point3dCollection pts = new Point3dCollection();
                    using (Brep brp = new Brep(sol))
                    {
                        foreach (var vtx in brp.Vertices)
                        {
                            pts.Add(vtx.Point);
                        }
                        return pts;
                    }
                }
                catch { return null; }
            }
        }

Re: Get Point Collection from 3dsolid

Anonymous — Sat, 03 Mar 2012 14:13:05 GMT

Thanks _guile, that was more along the lines of what I was looking for. Excellent.

Re: Get Point Collection from 3dsolid

Hugh_Compton — Fri, 08 Nov 2013 11:03:37 GMT

Sorry for my ignorance but when I convert this to VB.Net I get an unknown type for 'var'...?

Re: Get Point Collection from 3dsolid

_gile — Fri, 08 Nov 2013 11:38:05 GMT

Hi,

In C#, var keyword stands for 'implicit type', the (strongly typed) variable type is determined by the compiler at edition time.

In this case, the infered type is: Autodesk.AutoCAD.BoundaryRepresentation.Vertex

Re: Get Point Collection from 3dsolid

Hugh_Compton — Fri, 08 Nov 2013 11:52:06 GMT

Thanks Giles!