A Valve engineer fixed 3D lighting so hard he had to tell all the graphics card manufacturers their math was wrong, and the reaction was: 'I hate you' (www.pcgamer.com)

submitted 1 week ago by pookie@lemmy.blahaj.zone to c/technology@lemmy.world

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cross-posted from: https://lemmy.ca/post/34328210

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[-] ch00f@lemmy.world 5 points 1 week ago

For those who just wanna know: cards at the time performed math on brightness values assuming a linear brightness scale when it should be logarithmic.

[-] wewbull@feddit.uk 3 points 1 week ago

....ish

The maths was right, except it was all being done on colour values than already had the CRTs response curve baked into them. You may have heard of "gamma correction". Well, this is when you correct an images colour values for the display you'll view it on.

Blending before gamma correction and after gamma correction produce very different results. The cards were doing it after. This story is about doing it before.

Paul Debevec had similar observations around the same time. His work at the time was all about HDRI and that was put into Source a few years later.

[-] ch00f@lemmy.world 1 points 1 week ago

Figured someone would do it better than me. Thanks for the correction

[-] ekZepp@lemmy.world 2 points 1 week ago

1s77mh-2680624083

[-] SpaceNoodle@lemmy.world 1 points 1 week ago

I do this to my silicon vendor. I apparently made some people's lives very uncomfortable for a good while this past year after I decompiled some of their binary blobs.

[-] jagged_circle@feddit.nl 1 points 1 week ago

Everyone's saying RGB is the problem, but what's the alternative? CMYK?

[-] Asidonhopo@lemmy.world 1 points 1 week ago* (last edited 1 week ago)

Allow me to introduce you to the perceptually uniform color spaces, CIELAB, CIELUV and HSLuv, something I needed for a project I was working on a few years ago:

https://programmingdesignsystems.com/color/perceptually-uniform-color-spaces/

[-] SkaveRat@discuss.tchncs.de 1 points 1 week ago

When the HL2 documentary came out, someone said "all these gaming news sites will have contant for months" and they were absolutely right

this post was submitted on 06 Dec 2024

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