Engineering Fellow at Epic Game. I love games, graphics and lighting. https://knarkowicz.wordpress.comhttps://bsky.app/profile/knarkowicz.bsky.socialhttps://bsky.app/profile/knarkowicz.bsky.social/post/3msk2srbark2mIt's great to see ARM being so open about their neural joint denoising and upsampling, explaining their approach, network inputs, temporal stability and how they trained this network: https://community.arm.com/cfs-file/__key/communityserver-blogs-components-weblogfiles/00-00-00-20-66/2026_2D00_mmg_2D00_liam_2D00_nssd.pdf08 Aug 2026 02:51 +0000at://did:plc:od4bc4adtyrpkrnpj2e5l4b5/app.bsky.feed.post/3msk2srbark2mhttps://bsky.app/profile/knarkowicz.bsky.social/post/3mjbdjbuf2s2cAn interesting idea to use surfels not only as a surface cache (PBGI), but also as a geo approx to trace against. The main use case is mobile, where triangle ray tracing isn’t widely supported in HW, and raymarching SDFs isn’t a great fit for bandwidth-limited devices. https://gdcvault.com/play/1035619/The-Evolution-of-Real-Time12 Apr 2026 02:46 +0000at://did:plc:od4bc4adtyrpkrnpj2e5l4b5/app.bsky.feed.post/3mjbdjbuf2s2chttps://bsky.app/profile/knarkowicz.bsky.social/post/3mfldunkpb22sFloat to R8_UNorm conversion has a permitted tolerance of 0.6ulp in the DX spec. 0.55/255 on some GPUs rounds down to 0 and on others rounds up to 1/255. Dangerous behavior when R8_UNorm NumFramesAccumulated=0 is used by a denoiser to mark invalid history... https://microsoft.github.io/DirectX-Specs/d3d/archive/D3D11_3_FunctionalSpec.htm#3.2.3.6%20FLOAT%20-%3E%20UNORM24 Feb 2026 04:38 +0000at://did:plc:od4bc4adtyrpkrnpj2e5l4b5/app.bsky.feed.post/3mfldunkpb22shttps://bsky.app/profile/knarkowicz.bsky.social/post/3metghbb4j222Inspiring examples of stylized rendering in UE without any modifications to the engine. Just clever meshes and textures. Though I wonder if it holds up with changing lighting conditions? www.artstation.com/artwork/JrJKVv www.artstation.com/artwork/kNXBx2 https://www.artstation.com/artwork/JrJKVv14 Feb 2026 16:20 +0000at://did:plc:od4bc4adtyrpkrnpj2e5l4b5/app.bsky.feed.post/3metghbb4j222https://bsky.app/profile/knarkowicz.bsky.social/post/3metatz3rkc25Interesting paper showing great results for replacing standard low-res rendering + temporal upsampling (DLSS) with high-res GBuffer + adaptive sampling. Makes sense given rising costs of lighting computations vs GBuffer. arxiv.org/abs/2602.08642 https://arxiv.org/abs/2602.0864214 Feb 2026 14:40 +0000at://did:plc:od4bc4adtyrpkrnpj2e5l4b5/app.bsky.feed.post/3metatz3rkc25https://bsky.app/profile/knarkowicz.bsky.social/post/3lxcyzlje5s2vMegaLights slides were just posted online. There's a bunch of details in slide notes if you're curious how our new Stochastic Direct Lighting solution works, why we made it and want to learn a bit about the problem space. [contains quote post or other embedded content]26 Aug 2025 17:10 +0000at://did:plc:od4bc4adtyrpkrnpj2e5l4b5/app.bsky.feed.post/3lxcyzlje5s2vhttps://bsky.app/profile/knarkowicz.bsky.social/post/3lwh26ctyik22Thank you @ceruleite.bsky.social for 20 years of organizing the Adavances course. I did learn a lot from it over the years. And also for a really well chosen speaker swag :)15 Aug 2025 14:16 +0000at://did:plc:od4bc4adtyrpkrnpj2e5l4b5/app.bsky.feed.post/3lwh26ctyik22https://bsky.app/profile/knarkowicz.bsky.social/post/3ltyvromntc23Amazing talk about Neural Materials. Lots of insight - from why layered materials are important to an overview of current neural solutions and their tradeoffs: https://youtu.be/xUnXPNFWJUY?si=FqTDoJxXpIrKjuF_15 Jul 2025 12:29 +0000at://did:plc:od4bc4adtyrpkrnpj2e5l4b5/app.bsky.feed.post/3ltyvromntc23https://bsky.app/profile/knarkowicz.bsky.social/post/3lm5kyqwofc2lAnother great article from Chips and Cheese. This time about dynamic RDNA4 register allocation. Having full dynamic allocation would be huge for all those complex shaders we write nowadays, but as the article shows it's not easy to get there. [contains quote post or other embedded content]06 Apr 2025 13:38 +0000at://did:plc:od4bc4adtyrpkrnpj2e5l4b5/app.bsky.feed.post/3lm5kyqwofc2lhttps://bsky.app/profile/knarkowicz.bsky.social/post/3lkc4n3zajc2yInteresting to see a bit of details behind the amazing DLSS tech: https://research.nvidia.com/labs/adlr/DLSS4/13 Mar 2025 22:14 +0000at://did:plc:od4bc4adtyrpkrnpj2e5l4b5/app.bsky.feed.post/3lkc4n3zajc2yhttps://bsky.app/profile/knarkowicz.bsky.social/post/3lci62rxcv22cGraphics Programming Conference 2024 talks are up. Looking forward to learning the new Tomasz magic :) https://www.youtube.com/playlist?list=PLLaly9x9rqjsXLW1tMFruyh_657sh8epk04 Dec 2024 12:34 +0000at://did:plc:od4bc4adtyrpkrnpj2e5l4b5/app.bsky.feed.post/3lci62rxcv22chttps://bsky.app/profile/knarkowicz.bsky.social/post/3larw3wemfk2fDoes anyone know whether DoF is done through path tracing or post in offline movie rendering? I've heard that it's mostly done in post due to performance and extra flexibility, but I wonder whether that's still the case, and whether some shots are rendered (challenging DoF) and some in post.12 Nov 2024 22:48 +0000at://did:plc:od4bc4adtyrpkrnpj2e5l4b5/app.bsky.feed.post/3larw3wemfk2fhttps://bsky.app/profile/knarkowicz.bsky.social/post/3l7qfheicwp2eMegaLights release took me a bit by surprise. It was just a small prototype on a backburner, not planned to be showcased in UE 5.5. Now trying to catch up after the demo push, starting from writing the official docs which just went online: https://dev.epicgames.com/documentation/en-us/unreal-engine/megalights-in-unreal-engine30 Oct 2024 14:52 +0000at://did:plc:od4bc4adtyrpkrnpj2e5l4b5/app.bsky.feed.post/3l7qfheicwp2ehttps://bsky.app/profile/knarkowicz.bsky.social/post/3kg7cm7lxxy2h@demofox.bsky.social Hi, your ST blue noise is amazing, but I can't figure out how to draw N scalar values per pixel for N rays. Tex(screenPos+R2, frameIndex) or similar offsets have correlation artifacts (see img). frac(Tex(screenPos,frameIndex) + Golden ratio*FrameIndex%N) has worse convergence.10 Dec 2023 16:16 +0000at://did:plc:od4bc4adtyrpkrnpj2e5l4b5/app.bsky.feed.post/3kg7cm7lxxy2h