public void PrepareGroupStyles(Graph3D.Plot.Groups.PlotGroupStyleCollection externalGroups, Graph3D.Plot.Groups.PlotGroupStyleCollection localGroups, Graph3D.IPlotArea layer, Graph3D.Plot.Data.Processed3DPlotData pdata)
 {
     VariableColorGroupStyle.PrepareStyle(externalGroups, localGroups, GetColor);
 }
 public void PrepareGroupStyles(PlotGroupStyleCollection externalGroups, PlotGroupStyleCollection localGroups, IPlotArea layer, Processed2DPlotData pdata)
 {
     VariableColorGroupStyle.PrepareStyle(externalGroups, localGroups, GetColor);
 }