Load and unload Model3DGroup dynamically?

I have a changing list, from which I am reading data. (position values, and an ID for each entry). What i am trying to do, is load and unload Models into a helix Viewport as the list updates. I have approached this by loading 50 (the max possible number of list entries) into a vector, and then adding and removing them from the Model3DGroup that is set as the content for the ModelVisual3D. This works, but causes a lot of flickering. Is there a more sensible way to approach this?

Right now I have:

        //marker model
        public Model3DGroup modelMarker;

        //parent group
        public Model3DGroup rootGrp;

       //list of all objects
        public List<Model3DGroup> markerModels = new List<Model3DGroup>();

         //importer
           ModelImporter import = new ModelImporter();
            modelMarker = import.Load("data\\assets\\Marker.obj"); // load object

            rootGrp = new Model3DGroup();

            //load 50 markers into list
                for (int i=0;i< 50;i++)
               {
                    var markerTmp = new Model3DGroup();
                    markerTmp = modelMarker;
                    markerModels.Add(markerTmp);
                }

            model.Content = rootGrp; //model is the ModelVisual3D, set parent node as content

And (On a dispatcher timer):

      tmpList = Dense.pullData(); // fills list
                    if (tmpList.Count != 0) // if list is not empty
                    {
                        rootGrp.Children.Clear(); // clear the parent group

                        for (int i = 0; i < tmpList.Count; i++) // for each list entry
                        {
                            int index = Convert.ToInt32(tmpList[i].id); // the ID of each object
                            transMarker.X = tmpList[i].position[0];  // the positional data
                            transMarker.Y = tmpList[i].position[1] ;
                            transMarker.Z = tmpList[i].position[2];

                            quatMarker.X = tmpList[i].rotationQuats[0]; // the rotation data
                            quatMarker.Y = tmpList[i].rotationQuats[1];
                            quatMarker.Z = tmpList[i].rotationQuats[2] ;
                            quatMarker.W = tmpList[i].rotationQuats[3];

                            var matrixMarker = new Matrix3D(); // create a new Matrix3d
                            matrixMarker.Rotate(quatMarker);
                            matrixMarker.Translate(transMarker);
                    
                          rootGrp.Children.Add(markerModels[index]);  // add to the parent group

                             //transform the object
                            markerModels[index].Transform = new MatrixTransform3D(matrixMarker);
                        }

This works, but the objects flicker on and off, and are never all displayed at the same time. Is there a smarter way to do this?

thank you.

[holance]

You can download the source code, or use myget link from the home page of this project. The lastest build is the unstable version

[holance]

I would suggest to change to use sharpdx version. There is an instancing demo, which is doing exactly what you want.