public override bool Draw(RenderContext11 renderContext, float opacity, bool flat)
        {
            renderContext.WorldBase = renderContext.World ;
            renderContext.ViewBase = renderContext.View;
            Earth3d.MainWindow.MakeFrustum();
            renderContext.MakeFrustum();
            Earth3d.MainWindow.PaintLayerFullTint11(imageSet, this.Opacity * opacity * 100, Color);

            return true;
        }