chena

@SebAaltonen @dkharms_ It seems to be just reducing the permutation explosion caused by state changes, but most permutation explosion is caused by shader static condition branch, state don't change.

@dkharms_ I have some ideas in my blog post: sebastianaaltonen.com/blog/no-graphi…

The PSO explosion has grown so much that today we need massive cloud servers to deliver the PSOs. Each vendor has their own solutions. We should fix the root cause instead of building this massive infrastructure. tomshardware.com/pc-components/…

@panoskarabelas Did you use aftermath? breadcrumbs seems can't get more detailed info.

If you have no GPU breadcrumbs, implement them, yesterday.

@SoftEngineer Did any of the talks mention shadow culling? Thanks.

Doom Etarnal and its predecessor were ultra-optimized towards light counts. There are great presentations for both from SIGGRAPH. Elernal more-so. Makes sense that the team would push it as far as it goes. As for TDA - I guess part of it is the open-world(-ish) nature of the game. Unless your game is super-duper dark, it's actually really hard to make good use of local lighting in outdoor scenes. If you take a good-looking open-world game, they typically find ways to cover up the sky to create good environment for varied lighting. Such as a dense forest with occasional clearings and tall brush. Other games lean into making the landscape look beautiful, but that's not a lighting thing anymore. If you have walls and a ceiling - it gives you so many options for lighting fixtures. As humans we know that the sun is really freaking bright, so any light sources outside can't be too bright or they will look fake. Sad times. So yeah, you have to tone down main directional light source and make it overcast, push towards twilight and night as far as possible. Most games that have a day/night cycle cheat by making sunrise and sunset last several times longer proportionally than in real-life, because lighting is more interesting during those times.

@FilippoTarpini Which decompiler did you use? I can't find a decompiler support dxil.

@chena_cpp Yes. There's a few decompiler around for multiple shader model versions. Plus, as I said, Musa has reverse engineered the previous games. Pragmata wasn't much different.

How does Resident Evil Requiem, and more generally the latest RE Engine games, handle HDR? Here’s a technical breakdown of the defects we think it has. Obviously the game has HDR grading so that's already great in itself, and the on final screen results are good. For context: I’m a big RE fan, so this is not meant as hate or criticism; just a technical analysis! @MusaRenoDX, a fellow modder and collaborator, has been making mods to improve HDR and grading most of their games, and did for this one too (REverse engineering and replacing game shaders). They are pretty popular in the PC gaming community! Biggest problems: - Wrong transfer function used for SDR, which shifts the look unintentionally in SDR only, this gets baked into the default look of the game and assets, and is not transposed in HDR, hence HDR has a very different look on shadow (more raised). - HDR LUTs are pre tonemapped to 1k nits, and then re-tonemapped to your display peak. This means that if you set it to 1k nits, you actually get less as it tonemaps twice. This also means you can't get more than ~1k nits. - Improper paper white scaling. The user brightness is scaled in the wrong place, which skews all the colors sampled from the LUT. For example if the LUT tinted shadow red and midtones blue, if you double you brightness setting, shadow will start to be tinted blue, which breaks the game intended look. Minor problems: - They use separate LUT files for SDR and HDR, including one for each SDR gamma/OETF settings. The SDR one bakes in tonemapping, while the HDR one does display mapping after. A IMO simpler and more reliable workflow would be to have a single HDR LUT and neutrally compress to SDR or HDR at the end. - Setting the Gamma/OETF to Rec.709 apparently causes major banding. Either way it shouldn't be used if as it's not a transfer function used by displays. - LUTs input is in the AP0 (ACES storage) color space which means much of the input range is wasted as the game renders in Rec.709, a much smaller gamut. - There's no separate control for UI brightness which isn't ideal for UI visibility or OLED in general. - UI transparency blending looks a bit different between SDR and HDR which makes it unreliable from an artistic point of view, but it's not bad here. Previous games used SDR LUTs all the way and stretched them to HDR with sub optimal math, hence in HDR you'd have some weird hue shifts on shadow and broken gradients. They recently improved on that. The tonemapper here seems to be ACES (per channel + hue shifts) but we can't confirm as it's within LUTs. I really wish I could reach out to CAPCOM :D! SDR vs HDR pics.

@eclmist Hi, how to use dx12 RT in wpf? Thanks.

Last weekend I decided to write an editor for my DX12 renderer. I started a WPF project, but was immediately disappointed by the lack of a built-in window docking system. So I wrote one in🙂

@aviel08 Hi, when to release Reverie?

I'm putting together a simple Unreal scene to test Reverie out. I'll share the project files

@elliotgraytho So, just train once and support time of day?

Sick! Impressive when static but “we extend pre-computing a neural irradiance volume … by introducing new inputs to the model, e.g. the current position of the moving emitters. We train the irradiance field while randomly sampling the variable scene parameter” is a real mic drop

@guycalledfrank @devsh_gfx_prog github.com/AlexSabourinDe…

@devsh_gfx_prog It won't stretch THAT much though. Unless you supersample a very detailed noisy normal map (and even then... not sure... feels like there must some other factor at play). Cook Torrance won't stretch that much on a flat plane.

A regular Cook Torrance grazing lobe is anisotropic, the only reason you don't see that in games is because: - dynamic lights have cut-off radiuses - far away specular is almost always done with IBL or SSR IBL assumes V=N which makes the lobe isotropic and prefilters likewise.

@leegoonz73 Cool, maxSmoothness = 1.35/(1+pow(1.15*(0.0315*angularDiameter+0.4),2))-0.11; minRoughness = (1-maxSmoothness)^2; Where did the formula come from? Or How to derive it? Thanks.

Unity URP PBR 고도화 개발 사례: AAA급 렌더링 품질을 향한 여정 mazeline.tech/blogs/URPAdvan… #mazeline #unity #pbr #rendering #preintegratedFDG

@XorDev someguys use clamp(d / fwidth(d), 0.0, 1.0), don't use clamp(0.5 + d / fwidth(d), 0.0, 1.0), which one is correct? Thanks.

Easy anti-aliasing for anything: vec2 dxy = vec2(dFdx(d), dFdy(d)); float aa = smoothstep(-1.0, 1.0, d / max(length(dxy), 0.0001));

@FilippoTarpini Can't dm you, must be premium user?

@chena_cpp There's many problems with it. DM me if you are interested.

Quite excited to share Digital Foundry has discussed my recent HDR focused interview at length in their new stream youtu.be/VG2xDC1ZjOc?t=… Given HDR has an awareness+knowledge problem, the more exposure it gets, the sooner we’ll be able to enjoy it in all games without hassle!

@Red3rdeye420 @topotoylabs No, you send me a email?

@chena_cpp @topotoylabs Got a email?

Some more infrastructure for planetary-level terrain data streaming & rendering I am working on: "Edge-length"-based (raster) quad-tree splitting + frustum/horizon culling. #indiedev #gamedev #computergraphics #procedural #terrain #rendering

@Red3rdeye420 @topotoylabs Cool，Could you provide more info？Paper link or something？Thanks.

@VictoryLuode 第三个是什么场景？是游戏吗？

3 pieces to get to know me

@samuel_krug Beautiful cloud. How to simulate it?

Btw here's this cloud with a bit more density

@warheart1 Cool, When will it to be released?

WIP a bit on the "threads" window so you can see which thread/wave of the group you are watching, and whether the other threads are active/inactive. Also allows fast switching between threads in the group. #quackdebugger

@guycalledfrank Don't use gameobject, bake it to yourself data, load it use your streaming, and use brg to render it.

Are there some known optimization best practices for openworld-ish games in Unity? I got custom tex/mesh streaming, but there're basically too many GameObjects (renderers, colliders) and I'm not sure if it scales well even if I turn them off by range +there's cost of doing that…

@BenSimsTech @Trans_Lykeia Sky and cloud is two pass or single pass? Use 1 sample per pixel importance sampling to get ambient lighting or just shadow?

@Trans_Lykeia It uses a few LUTs yeah, but the sky is rendered using raymarching so it can sample shadow+volumetric cloud shadowmaps. Since this can be a bit expensive, it uses importance sampling proportional to sky-luminace, so the samples are concentrated in the most noticeable locations.

Shaders are fun. Sky+lightrays rendered together with 1 sample per pixel+temporal with importance sampling) Clouds+sky integrate with ambient probe and aerial perspective so environment light is cohesive. End result is quite nice, only change between these pics is sun+view angle