>>385019594
>it's a single small effect.
the insidious thing about grabpasses is that they force all rendering to pause while the GPU copies the current screen contents into a new texture. no matter how small it is, it will lag people a lot. it's not a per-pixel thing, it's on or off.
>>385019695
grabpasses are hell if not properly accounted for. audiolink for instance uses a grabpass, it's still kinda bad but they mitigate it a bit with camera tricks and MSAA and HDR off.
just 3 people using this "effect" on their glasses grinds your FPS to a halt in VR, especially if you use MSAA. have like 4 different named grabpasses in the same scene and even on desktop you probably won't get more than 45 FPS.