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Texture pixel have max color from all pixels above

Hi. I want to make texture pixels get the max color value from itself and all pixels above. It should change something like this

https://forums.unrealengine.com/filedata/fetch?filedataid=152671&type=thumb

into this

https://forums.unrealengine.com/filedata/fetch?filedataid=152686&type=thumb

. I don’t know a lot about material editor, so maybe there already is a node for it or it’s not posible.