How to create a CadPolyline with 3D data (Z coordinates)?

Aspose.CAD Product Family
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1

I’m using Aspose.CAD for .NET (C#) and I’m generating a DwgImage completely from scratch.

I’ve successfully created a CadLwPolyline using 2D coordinates, but now I need to represent actual 3D data — meaning coordinates that include Z-values. For that purpose, I assume I need to use CadPolyline, but I couldn’t find a clear example or explanation in the documentation.

Question:
Could you please clarify if it’s possible to properly create a CadPolyline with full 3D coordinates (X, Y, and Z), and what the recommended way is to achieve this in a newly created DwgImage?

Thanks in advance!

2

@Abne

Could you please provide more details about the specific method or properties you are using to create the CadPolyline with 3D coordinates in Aspose.CAD for .NET?

3

I’m currently using a custom method called CreateCadLwPolyline to create CadLwPolyline objects using 2D points that I extract from 3D data (by dropping the Z-coordinate).

Here’s a simplified version of the method:

internal CadLwPolyline? CreateCadLwPolyline(Feature feature, CadImage templImage)
{
    var points = Create2DPointsFrom3DData(feature);
    if (points.Count < 2) return null;
    var cadPolyline = new CadLwPolyline
    {
        Coordinates = points,
        Flag = CadLwPolylineFlag.None,
        PointCount = points.Count,
        LayerName = feature.SymbolName,
        IsByLayer = true,
    };
    return cadPolyline;
}

This works well for 2D representation, but since I now want to include real 3D coordinates (with Z values), I’d like to switch from CadLwPolyline to CadPolyline.

My question is: how can I properly build a CadPolyline with 3D vertices in a new DwgImage, and what is the recommended way to associate the 3D points with the polyline object?

4

@Abne,
Hi,
we have created CADNET-10143 to investigate issues with adding this entity.

1 Like
5

@Abne,
Hello,
please, test if this example is useful:

 var dwgImage = new DwgImage();
 var cadPolyline3D = new CadPolyline3D()
 {
     ObjectHandle = NextAvailableHandle(dwgImage),
     Flag = CadPolylineFlag.POLY_3D
 };

 var points = new List<Cad3DPoint>()
 {
     new Cad3DPoint(00, 0, 10),
     new Cad3DPoint(40, 40, 50),
     new Cad3DPoint(80, 80, -10)
 };

 foreach (var point in points)
 {
     var vertex = new Cad3DVertex()
     {
         ObjectHandle = NextAvailableHandle(dwgImage),
         SoftOwner = cadPolyline3D.ObjectHandle,
         XDirMissingFlag = true,
         LocationPoint = point,
     };

     cadPolyline3D.ChildObjects.Add(vertex);
 }

 var seqend = new CadSeqend()
 {
     ObjectHandle = NextAvailableHandle(dwgImage),
     SoftOwner = cadPolyline3D.ObjectHandle,
     XDirMissingFlag = true,
 };

 cadPolyline3D.ChildObjects.Add(seqend);
 dwgImage.AddEntity(cadPolyline3D);

 dwgImage.Save("3dpolyline.dwg");
1 Like
6

Yes, the code is working well. Thank you!
So far, I’m able to create layers, blocks, and polygons. I still need to check if I can copy blocks from one DWG file to a new one.
Thanks again for your help — if I run into any issues, I’ll let you know.

1 Like