Light sources in video games and such. If you have a light source with a very large falloff range illuminating a large area, you'll have noticable steps in the gradient.
Ordered dithering is a very cheap solution to this.
Truly random per-frame noise looks bad and grainy (imho), but various noise functions work well, yes.
Many implementations just sample some noise texture, possibly because that's cheaper - but hardware is so fast nowadays that even sampling some non-trivial noise function many times per pixel hardly registers.
A deferred 2.5D renderer I wrote some while ago just does this screen-wide on the entire framebuffer in a post process step and that pretty much hides all banding already:
You might call this random noise (though it's static). It's enough if you're operating in high precision framebuffers for most rendering steps, and will do a decent job at hiding banding when things are downsampled to whatever the screen supports.
If you can't afford to just rgba16float everything you might have to be smarter about what you do on an individual light level. Probably using some fancier noise/making sure overlapping lights don't amplify the noise.
Shallow color gradients (e.g. blue sky or anime) result in visible banding on 8bpc displays, which is a large fraction of displays.
Ordered dithering is GPU-friendly, so it's useful to reduce higher-bpc content to those display formats without introducing banding.
Any time you want a sequence to be deterministic, seem familiar, and also have a roughly even mix of element types. Think shuffling playlists, ordering search results, etc.
I would think that it would only be beneficial on devices that don't maintain a full frame rendering buffer or if they wanted to do partial updates.
If the full frame is maintained with more values then quite a lot of things like Floyd Steinberg optimize well enough to be integrated with a full frame update.
While there are always those lows, when the kids are sick, scream, have tantrums, do something stupid, I would not trade a second of that away. A lot of happiness and laughs as well, along the way.
They grow and you're privileged to live with them for a while. Also you'll grow with them.
So I guess Chuck Norris has now keys for the Pearly Gates and is the one who gets to pick the heavenly club members. I'm sure roundhouse kicks are somehow part of the process.
A short term benefit from government subsidized RAM will burn you down the road when the Chinese are the only place to get your goods. But I guess that was the original achilles heel of capitalism anyway.
I wouldn't be surprised if both 'adsharma' and 'jcalvinowens' were right, just at different points in time, perhaps in a bit different context. Things change.
reply