Evan Hart

NvRTX-5.4 non-preview finally released. Some good cvar/control refactoring (much stuff now available in PPV). Good ReSTIR GI improvements.

Also, thanks to Richard Cowgill for the work on the kitchen scene for showing off the enhancements.

A special mention to @Jiayin_Cao as his work on the ReSTIR GI stuff is the major upgrade in this release.

After a delay, we've finally released an nvrtx-5.4 branch for those that want to play with ReSTIR DI & GI in UE5.4. This is just a preview at this point as we're working on some refactoring. github.com/NvRTX/UnrealEn…

This was pretty rewarding discovery from days of staring at profiles. I’m glad I could sneak it in.

@SebAaltonen If it’s the series posted, I’ll take the blame. Things have changed a bit since then, but a lot still applies. Where things get more in the weeds is bindless and buffer pointers in the root sig.

Anybody remember an old blog post by Nvidia, where they recommend using constant buffers for tiled deferred lights (instead of structured buffer)? Trying to find it somewhere but my google-fu is lacking. This was Pascal (GTX 1080) generation stuff (Turing had faster raw loads).

Great news - our #GDC2024 talk on Real-Time Path-Traced Light Transport in UE5 is now freely available on the GDC Vault. No login required! gdcvault.com/play/1034648/A…

Branch in question: github.com/NvRTX/UnrealEn… (remember, you need UE permissions from Epic, since this is a derivative of their code)

Our GDC update for the nvrtx branch of UE5 is out. Some great work by @Jiayin_Cao in shipping an experimental implementation or ReSTIR GI. Attached video is only lit via emissive surfaces w/ ReSTIR GI.

@Alwaysthesame4 @acmarrs Talking to our DLSS plugin team, we don’t actively support VR for the plugin, because the engine interface used doesn’t support VR. That said, we’ll try to take a look.

@PixelCurmudgeon @acmarrs Hi, seem that DLSS 3.7 update in nvrtx-5.3 branch broke VR compatibility (crash in Streamline)

Today is the day. If you want to see some cool lighting tech, @acmarrs and I are talking at 4:10 at GDC. 1k+ dynamic lights and GI all at >60 fps built on a branch of UE5.

@Alwaysthesame4 @acmarrs I’ll check with the DLSS maintainers. Thanks for the report.

@lumpy668 @acmarrs @Jiayin_Cao Sorry, the talk was a GDC invited one, so the recording is GDC’s. We have discussed doing some follow-up material.

@acmarrs @PixelCurmudgeon @Jiayin_Cao Hi. Is it possible to watch this for free? As a UE5 developer, this talk seems extremely important and I would love to know more about it. However, the GDC Vault is $649 which is impossible for me to pay. Thank you.

Our #GDC2024 talk on Real-Time Path-Traced Light Transport in UE5 is now available in the GDC Vault. gdcvault.com/play/1034648/A…

Excited to talk about how we accomplished real-time path-traced light transport in #UnrealEngine5 with @PixelCurmudgeon at our #GDC2024 Advanced Graphics Summit talk on Monday! See you there: schedule.gdconf.com/session/advanc…

Discover how to bring real-time path-traced lighting to life in #UnrealEngine5 at our #GDC2024 Advanced Graphics Summit. Learn about ReSTIR, the key to complex lighting environments, and gain insights from our integration experiences.

Can Lumen function as part of a path tracer? 🤔 Come see my talk with @acmarrs at GDC for some deeper thoughts. schedule.gdconf.com/session/advanc…

@manish4u2 @acmarrs @Jiayin_Cao No, we’re still polishing it, but even when that is done, the asset size is impractical for a git repo. We do intend to release it at some point.

@PixelCurmudgeon @acmarrs @Jiayin_Cao Is this scene available in the branch ?

Happy to announce our nvrtx-5.3 branch for those interested in enhanced UE5 features. Good work as always by the team. github.com/NvRTX/UnrealEn… #SER #RTXDI

@volodXYZ And I definitely understand the merge pain as I feel it every few months. We always strive for upstreaming features, but size, complexity, etc can make it slow.

@PixelCurmudgeon Thanks for the answer. I suspected as much, but glad to hear it from the source.

Shipped an update to our NvRTX branch of UE5 yesterday. Offers some pretty cool real-time effects, including semi-transparent shadows.

@volodXYZ Some things don’t fit into plugins, or would require crazy amounts of extra work to use. ReSTIR and the transparent shadows are in these categories. The only vendor specific code in NvRTX are optional optimizations for SER.

@PixelCurmudgeon Why was the RTXGI Plugin approach abandoned post 5.0? It's quite hard to integrate changes from the NvRTX branch while keeping projects vendor-agnostic. It seemed like the ideal solution, by having everything wrapped in a plugin that users can enable. DLSS adoption proves it.