[abenedik]

You can check the Tag on the MeshObjectNode inside your FilterObjectsFunction - for example:

Code:

private static bool FilterObjectsByTagFunction(RenderablePrimitiveBase renderablePrimitiveBase)
{
    var originalSceneNode = renderablePrimitiveBase.OriginalObject as SceneNode;
    if (originalSceneNode != null)
    {
        var tag = originalSceneNode.Tag;
        return true; // Add check
    }

    return false;
}