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Adam Marrs

@acmarrs.bsky.social

1.4K followers 87 following 35 posts

Graphics and video games. Principal Graphics Engineer at NVIDIA. Computer Science PhD. Thoughts here are my own.

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Adam Marrs @acmarrs.bsky.social · Oct 22

[August 4, 2021]
I am delighted to announce that Ray Tracing Gems II is available *now* and is *free* to download! 7 sections. 50 chapters. 90 authors from across the globe.

Download #RTGII here: link.springer.com/book/10.1007...

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Adam Marrs @acmarrs.bsky.social · 19d

Check out our webinar at 1pm EST / 10am PST

Richard, Kelsey, and I will chat about the latest updates to RTX Mega Geometry in NvRTX 5.6 and our upcoming Bonsai showcase.

Free for all. Recording available after.

Register here: nvda.ws/41BVLQR

Adam Marrs @acmarrs.bsky.social · Aug 18

Checking out RTX Mega Geometry in NvRTX 5.6?

Download our Zorah Sample Content pack and you'll get three scenes (including the scene in this image) made by our Lightspeed Art team specifically for RTX Mega Geometry.

Get it here: dlss.download.nvidia.com/demos/zorah/...

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Adam Marrs @acmarrs.bsky.social · Aug 18

Happy Gamescom! We've pushed an update to NvRTX 5.6 that improves performance, adds new debugging features, and brings RTX Mega Geometry to the main branch.

Details and instructions on how to access NvRTX: developer.nvidia.com/blog/announc...

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Reposted by Adam Marrs

Nicolas Lopez @nicolas-lopez.bsky.social · May 29

It’s really cool to see my talk freely available for everyone. I’m proud of the work our team accomplished, and it means a lot that it’s now accessible to a wider audience.
Huge thanks to the GDC team for putting it out there!

#AssassinsCreedShadows #GameDevelopment #GDC2025

Game Developers Conference @officialgdc.bsky.social · May 29

Now on GDC YouTube: Rendering 'Assassin's Creed Shadows'

AC: Shadows is a large systemic open world game with dynamic time of day cycles, a systemic weather system, and seasons. Find out how they made it happen.

www.youtube.com/watch?v=yj5p...

Rendering 'Assassin's Creed Shadows'

YouTube video by Game Developers Conference

www.youtube.com

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Adam Marrs @acmarrs.bsky.social · May 29

Wow, the REAC Conference lineup is *stacked* this year! Looking forward to all the talks. enginearchitecture.org/2025.htm

REAC: 2025 Conference.

enginearchitecture.org

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Reposted by Adam Marrs

Louis Bavoil @louisbavoil.bsky.social · May 15

New blog post: developer.nvidia.com/blog/path-tr...

Path Tracing Optimization in Indiana Jones™: Shader Execution Reordering and Live State Reductions | NVIDIA Technical Blog

This post is part of the Path Tracing Optimizations in Indiana Jones™ series. While adding a path-tracing mode to Indiana Jones and the Great Circle™ in 2024, we used Shader Execution Reordering (SER)...

developer.nvidia.com

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Reposted by Adam Marrs

Louis Bavoil @louisbavoil.bsky.social · May 15

New blog post: developer.nvidia.com/blog/path-tr...

Path Tracing Optimizations in Indiana Jones™: Opacity MicroMaps and Compaction of Dynamic BLASs | NVIDIA Technical Blog

The first post in this series, Path Tracing Optimization in Indiana Jones™: Shader Execution Reordering and Live State Reductions, covered ray-gen shader level optimizations that sped up the main path...

developer.nvidia.com

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Adam Marrs @acmarrs.bsky.social · May 15

So stoked the Slayer is back! Rip and Tear...until it is done. www.youtube.com/watch?v=uq8s...

From The Ashes - DOOM: The Dark Ages (Original Game Soundtrack) OFFICIAL

YouTube video by Finishing Move Inc.

www.youtube.com

Adam Marrs @acmarrs.bsky.social · May 14

Congrats Brian! Very well deserved.

Reposted by Adam Marrs

Kostas Anagnostou @kostasanagnostou.bsky.social · May 12

A nice, visual introduction to reservoir sampling: samwho.dev/reservoir-sa...

Reservoir Sampling

Choosing fairly when you don't know how many you're choosing from.

samwho.dev

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Adam Marrs @acmarrs.bsky.social · May 2

Our #GDC25 talk on Path Tracing Nanite in UE5 is now available on YouTube: youtu.be/8AnVpcIczyk

GDC 2025 | Path Tracing Nanite in NVIDIA Zorah - Full Session Replay

YouTube video by NVIDIA Game Developer

youtu.be

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Adam Marrs @acmarrs.bsky.social · Apr 30

Our #GDC25 talk on RTX Mega Geometry and how it was used in UE5 and Alan Wake 2 is now available on YouTube: www.youtube.com/watch?v=Kblm...

GDC 2025 | Scale Up Ray Tracing in Games With RTX Mega Geometry - Full Session Replay

YouTube video by NVIDIA Game Developer

www.youtube.com

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Adam Marrs @acmarrs.bsky.social · Apr 28

It's an astonishing achievement by a (relatively) small group. Keep on playing, there are great moments of levity and humor mixed in.

Adam Marrs @acmarrs.bsky.social · Apr 17

AC Shadows is a remarkable real-time graphics showcase. The world feels natural, alive, and I regularly find myself stopping to just watch the weather system do its thing. Screenshots don't do it justice, so go play it 😄.

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Adam Marrs @acmarrs.bsky.social · Apr 16

The Zorah Sample Content is available here: developer.nvidia.com/rtx-kit

NVIDIA RTX Kit

Render game assets with AI, create game characters with photo-realistic visuals, and more.

developer.nvidia.com

Adam Marrs @acmarrs.bsky.social · Apr 16

Instructions on how to access NvRTX, our branch of Unreal Engine, are here: developer.nvidia.com/game-engines...

Once you're setup, pull the nvrtx-5.4_zorah_experimental branch to try out the code.

NVIDIA RTX Branch (NvRTX)

Shortens development cycles and creates more stunning visuals.

developer.nvidia.com

Adam Marrs @acmarrs.bsky.social · Apr 16

Our #GDC25 talk "Scale Up Ray Tracing in Games with RTX Mega Geometry" is now online, free to watch for all: www.nvidia.com/en-us/on-dem...

Scale Up Ray Tracing in Games With RTX Mega Geometry | Game Developers Conference (GDC) 2025 | NVIDIA On-Demand

With 3D sculpting, photogrammetry, and generative AI, geometric complexity has exploded, forcing game engines to adapt

www.nvidia.com

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Adam Marrs @acmarrs.bsky.social · Apr 16

Our #GDC25 talk "Path Tracing Nanite in NVIDIA Zorah" is now online, free to watch for all: www.nvidia.com/en-us/on-dem...

Path Tracing Nanite in NVIDIA Zorah | Game Developers Conference (GDC) 2025 | NVIDIA On-Demand

In this session, we will discuss the cutting-edge algorithms and techniques behind NVIDIA's Zorah Blackwell launch demo

www.nvidia.com

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Adam Marrs @acmarrs.bsky.social · Apr 11

@nicolas-lopez.bsky.social FYI: the Zorah sample content is now posted (see the "Download Zorah Sample" button) developer.nvidia.com/rtx-kit/. It's a chonky download at 108GB. Enjoy 😄

NVIDIA RTX Kit

Render game assets with AI, create game characters with photo-realistic visuals, and more.

developer.nvidia.com

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Adam Marrs @acmarrs.bsky.social · Mar 27

Also, congrats and great job with AC Shadows! I’m happy to see you all using RTXGI/DDGI-ish irradiance probes as an infinite bounce cache after the second path vertex. This is exactly what I’ve been wanting to see in (more) games since the first release of RTXGI! 🥳

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Adam Marrs @acmarrs.bsky.social · Mar 27

Thanks, @nicolas-lopez.bsky.social! This is unintended. I think some wires may have gotten crossed. I’ll look into it and post the correct link as soon as it’s available.

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Adam Marrs @acmarrs.bsky.social · Mar 27

Yup! The talk was recorded and will be available for free on the NVIDIA On Demand site. Usually takes a few weeks for it to show up. I’ll post a link when it arrives.

Adam Marrs @acmarrs.bsky.social · Mar 22

Great work! Now let’s get those clusters in the BVH 😀

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Adam Marrs @acmarrs.bsky.social · Mar 19

We’ve released the code and content! See our talk for more info on how to access.

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Adam Marrs @acmarrs.bsky.social · Mar 19

To access the link, you need to have setup a GitHub account with Unreal Engine access. Instructions are here: developer.nvidia.com/game-engines...

NVIDIA RTX Branch (NvRTX)

Shortens development cycles and creates more stunning visuals.

developer.nvidia.com