I have this code run in C#.net Framework 4.8 in visual studio 2022 does anyone know how to change from paint 2 color alternate on solid3d object to paint 2 color alternate on every face in solid3d object.

More specific: when chosing 2 color from autocad paint window(1-255), color1 will apply to even faces, color2 will apply to odd faces, now i want to change both two color will apply alternate on every face on solid3d object.

One more thing im first try using Solid3d.SetSubentityMaterial method(Solid3d.SetSubentityColor method applies a single color) but failed, anyone know better way
here my code:

private void ApplyColorsTo3DObject()
{
    // Get the active document and its database
    Document doc = Application.DocumentManager.MdiActiveDocument;
    Database db = doc.Database;
    Editor ed = doc.Editor;

    // Check if both colors have been chosen, if not, prompt the user
    if (_color1 == null || _color2 == null)
    {
        ed.WriteMessage("nPlease choose 2 colors.");
        return;
    }

    // Lock the document to prevent other operations while applying the colors
    using (var lck = doc.LockDocument())
    {
        // Prompt the user to select a 3D object
        PromptEntityOptions peo = new PromptEntityOptions("nSelect 3D object:");
        peo.SetRejectMessage("nNot a Solid3d object.");
        peo.AddAllowedClass(typeof(Solid3d), true); // Only allow Solid3d objects
        var per = ed.GetEntity(peo);

        // If the user did not select an object, exit the function
        if (per.Status != PromptStatus.OK)
        {
            ed.WriteMessage("nObject not found.");
            return;
        }

        // Start a transaction to modify the 3D object
        using (Transaction tr = db.TransactionManager.StartTransaction())
        {
            // Get the Solid3d object from the ObjectId
            Solid3d solid3d = tr.GetObject(per.ObjectId, OpenMode.ForWrite) as Solid3d;
            if (solid3d == null)
            {
                // If the selected object is not a valid Solid3d, show an error
                ed.WriteMessage("nSelected object is not a valid Solid3d.");
                return;
            }

            // Create a FullSubentityPath to access the BREP (boundary representation)
            var fullSubentityPath = new FullSubentityPath(new[] { per.ObjectId }, new SubentityId(SubentityType.Null, IntPtr.Zero));
            
            using (var brep = new Brep(fullSubentityPath))
            {
                int faceIndex = 0;
                var faces = brep.Faces.ToArray(); // Get all the faces of the 3D object

                // Loop through each face and apply alternating colors
                foreach (var face in faces)
                {
                    try
                    {
                        var subEntityId = face.SubentityPath.SubentId;
                        var colorToApply = (faceIndex % 2 == 0) ? _color1 : _color2; // Apply color1 to even faces, color2 to odd faces
                        solid3d.SetSubentityColor(subEntityId, colorToApply); // Set the color of the face
                        faceIndex++; // Move to the next face
                    }
                    catch (System.Exception ex)
                    {
                        // Handle any exceptions and display an error message
                        ed.WriteMessage($"nERROR: {ex.Message}");
                    }
                }

                // Commit the transaction to apply the changes
                tr.Commit();
            }
        }
    }
}