static public bool Displayed(this IDrawTask draw, IDrawer drawer = null, IDrawClient drawClient = null, ISceneNode sceneRoot = null)
{
return(draw.Rendered &&
(drawer == null ||
(sceneRoot == null || drawer.DrawPredicate(sceneRoot)) &&
(draw.DrawPredicate == null || draw.DrawPredicate(drawer))) &&
(drawClient == null || draw.DrawClientFilter == null || draw.DrawClientFilter.Filter(drawClient)));
}