eInvalidContext exception when calling SubDMesh.ConvertToSolid method

[cgcamilo]

Hello,

I am using the RealDWG2015 sdk. I am using it to export into dwg my own representation.

The code is something like:

using (Database db = new Database(true, true))
{
using (Transaction tr = db.TransactionManager.StartOpenCloseTransaction())
{
// Open the block table.
BlockTable bt = (BlockTable)tr.GetObject(db.BlockTableId, OpenMode.ForRead);
// Find the model space block and open it for write.
ObjectId modelSpace = bt[BlockTableRecord.ModelSpace];
BlockTableRecord table = (BlockTableRecord)tr.GetObject(modelSpace, OpenMode.ForWrite);
Traverse(table, tr, db); // HERE I start creating entities
tr.Commit();
}
db.SaveAs(path, DwgVersion.Newest);
}

In the traverse method at some point I create a SubDMesh and add it to the database. Everything works, but if instead of the SubDMesh database I want to create a Solid3D, I am doing:

Solid3d solid = mesh.ConvertToSolid(true, true);

However I always get "eInvalidContext" when calling that method. Is there any reason for this?

Also, What I doing exactly is exporting my solids which are geometries compused of triangles with share vertices, what would be the best entity in this case? solid3D?

Thank you!

[LE3]

You may need to provide more code detail of what you use in your traverse method, maybe it is a complex mesh and cannot be converted into a solid, wrapped into try-catch blocks. HTH 

[cgcamilo]

Hello LE3 again,

thank you for your interest in this question. The code is simple, is just this:

SubDMesh mesh = new SubDMesh();

Point3dCollection vertarray = new Point3dCollection();
Int32Collection facearray = new Int32Collection();

// adding points
for (int i = 0; i < allMyPoints.Count; i++)
{
 var p = allMyPoints[i];
 vertarray.Add(new Point3d(p.X, p.Y, p.Z));
}

// adding triangles
for (int i = 0; i < allMyTriangles.Count; i++)
{
 int v1 = allMyTriangles[i * 3];
 int v2 = allMyTriangles[i * 3 + 1];
 int v3 = allMyTriangles[i * 3 + 2];
 facearray.Add(3); // because is a triangle
 facearray.Add(v1);
 facearray.Add(v2);
 facearray.Add(v3);
}

mesh.SetDatabaseDefaults();
mesh.SetSubDMesh(vertarray, facearray, 0);

// following throws eInvalidContext exception
Solid3d solid = mesh.ConvertToSolid(true, true);

At the end what I want is to create a dwg file that shows solids when opening it. I know that with "Face" class it works, but Face class represent just a a single triangle (or quad) without sharing vertices among other faces. SubDMesh class do what I want but when I open the generated dwg file I do not see it as a solid (but lines).

Thank you!

[Balaji_Ram · Accepted solution]

Hello Camilo,

Can you verify if the mesh is not self-intersecting and closed ?

That is the usual cause of this exception.

I would suggest creating the SubDMesh using the same information in AutoCAD and 

converting it to a solid using the "CONVTOSOLID" command.

That should provide some hints on what could be wrong with the mesh.

Also try creating a simple box mesh using your code and see if that succeeds in converting it to a solid.

Regards,

Balaji