I disagree that you really need to put much effort into updating the materials to get benefits from rtx. HL1 RTX looks pretty great with only the bare minimum PBR remasters, because PBR and RTX are 2 separate things that both improve a game’s look. PBR materials help rtx just as much as PBR materials help regular rendering, and rtx helps PBR materials only a little bit more than rtx helps regular materials. All of the effects used in PBR materials apply the same to regular rendering as with RTX.