/// <summary>
 /// Sets the material association for a layer.
 /// </summary>
 /// <param name="LayerIndex"></param>
 /// <param name="Abs">0 to 100</param>
 /// <param name="Scat">0 to 100</param>
 /// <returns></returns>
 public static bool Material_SetLayer(int LayerIndex, int[] Abs, int[] Scat, int[] Trans)
 {
     Rhino.DocObjects.Layer layer = Rhino.RhinoDoc.ActiveDoc.Layers[LayerIndex];
     layer.SetUserString("ABSType", "");
     layer.SetUserString("Acoustics", RC_PachTools.EncodeAcoustics(Abs, Scat, Trans));
     return(Rhino.RhinoDoc.ActiveDoc.Layers.Modify(layer, LayerIndex, false));
 }
            /// <summary>
            /// Sets the material association for a layer.
            /// </summary>
            /// <param name="LayerName"></param>
            /// <param name="Abs">0 to 100</param>
            /// <param name="Scat">0 to 100</param>
            /// <returns></returns>
            public static bool Material_SetLayer(string LayerName, int[] Abs, int[] Scat, int[] Trans = null)
            {
                int layer_index = Rhino.RhinoDoc.ActiveDoc.Layers.Find(LayerName, true);

                Rhino.DocObjects.Layer layer = Rhino.RhinoDoc.ActiveDoc.Layers[layer_index];
                layer.SetUserString("Acoustics", RC_PachTools.EncodeAcoustics(Abs, Scat, Trans));
                return(Rhino.RhinoDoc.ActiveDoc.Layers.Modify(layer, layer_index, false));
            }