@kenchan I knew that.
I want not stacking by z-order, I want simultaneous stacking.
It works something like that by default (if opacity of items is 0.5 )
output = Merge(Merge(background, 0.5 × item1), 0.5 × item2)
I want something like that
output = Merge(background, 0.5 × item1, 0.5 × item2)
aka simultaneous merge items to scene, so it not depends from z-order.
(example — I want ⅓ background, ⅓ item1 and ⅓ item2, Indifferently to items z-order)
