Adam Marrs
@acmarrs.bsky.social
Graphics and video games. Principal Graphics Engineer at NVIDIA. Computer Science PhD. Thoughts here are my own.
Pinned
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...
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...
Reposted by Adam Marrs
Everything about making video games is harder than you think.
November 6, 2025 at 11:07 AM
Everything about making video games is harder than you think.
We've made the content and project files for our new Bonsai demo freely available, so you can run it yourself.
Download the project, a developer guide, and even a binary executable of the demo here: developer.nvidia.com/game-engines...
Download the project, a developer guide, and even a binary executable of the demo here: developer.nvidia.com/game-engines...
October 21, 2025 at 6:56 PM
We've made the content and project files for our new Bonsai demo freely available, so you can run it yourself.
Download the project, a developer guide, and even a binary executable of the demo here: developer.nvidia.com/game-engines...
Download the project, a developer guide, and even a binary executable of the demo here: developer.nvidia.com/game-engines...
Today we released a new demo showcasing RTX Mega Geometry, ReSTIR PT, and DLSS all running together in our NvRTX branch of UE 5.6.
www.youtube.com/watch?v=3qyo...
www.youtube.com/watch?v=3qyo...
Bonsai Diorama Demo | NVIDIA RTX Unreal Engine 5.6.1
YouTube video by NVIDIA Game Developer
www.youtube.com
October 21, 2025 at 6:50 PM
Today we released a new demo showcasing RTX Mega Geometry, ReSTIR PT, and DLSS all running together in our NvRTX branch of UE 5.6.
www.youtube.com/watch?v=3qyo...
www.youtube.com/watch?v=3qyo...
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
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
September 23, 2025 at 2:59 PM
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
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
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/...
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/...
August 18, 2025 at 9:22 PM
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/...
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/...
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...
Details and instructions on how to access NvRTX: developer.nvidia.com/blog/announc...
August 18, 2025 at 9:13 PM
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...
Details and instructions on how to access NvRTX: developer.nvidia.com/blog/announc...
Reposted by Adam Marrs
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
Huge thanks to the GDC team for putting it out there!
#AssassinsCreedShadows #GameDevelopment #GDC2025
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...
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
May 29, 2025 at 5:42 PM
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
Huge thanks to the GDC team for putting it out there!
#AssassinsCreedShadows #GameDevelopment #GDC2025
Wow, the REAC Conference lineup is *stacked* this year! Looking forward to all the talks. enginearchitecture.org/2025.htm
REAC: 2025 Conference.
enginearchitecture.org
May 29, 2025 at 1:01 PM
Wow, the REAC Conference lineup is *stacked* this year! Looking forward to all the talks. enginearchitecture.org/2025.htm
Reposted by Adam Marrs
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
May 15, 2025 at 4:38 PM
New blog post: developer.nvidia.com/blog/path-tr...
Reposted by Adam Marrs
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
May 15, 2025 at 4:39 PM
New blog post: developer.nvidia.com/blog/path-tr...
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
May 15, 2025 at 1:07 PM
So stoked the Slayer is back! Rip and Tear...until it is done. www.youtube.com/watch?v=uq8s...
Reposted by Adam Marrs
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
May 12, 2025 at 12:39 PM
A nice, visual introduction to reservoir sampling: samwho.dev/reservoir-sa...
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
May 2, 2025 at 1:48 PM
Our #GDC25 talk on Path Tracing Nanite in UE5 is now available on YouTube: youtu.be/8AnVpcIczyk
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
April 30, 2025 at 9:06 PM
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...
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 😄.
April 17, 2025 at 3:39 PM
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 😄.
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
April 16, 2025 at 1:18 PM
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...
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
April 16, 2025 at 1:16 PM
Our #GDC25 talk "Path Tracing Nanite in NVIDIA Zorah" is now online, free to watch for all: www.nvidia.com/en-us/on-dem...
"Zorah" is a showcase of our work on RTX Mega Geometry, ReSTIR PT, and more in UE5. Really happy with the results and astonished at the incredible assets our art team built.
If you are at GDC, come to our talk "Path Tracing Nanite in Zorah" tomorrow to learn more!
www.youtube.com/watch?v=5wbp...
If you are at GDC, come to our talk "Path Tracing Nanite in Zorah" tomorrow to learn more!
www.youtube.com/watch?v=5wbp...
Zorah | Neural Rendering, Powered by GeForce RTX 50 Series and AI
YouTube video by NVIDIA GeForce
www.youtube.com
March 19, 2025 at 5:36 AM
"Zorah" is a showcase of our work on RTX Mega Geometry, ReSTIR PT, and more in UE5. Really happy with the results and astonished at the incredible assets our art team built.
If you are at GDC, come to our talk "Path Tracing Nanite in Zorah" tomorrow to learn more!
www.youtube.com/watch?v=5wbp...
If you are at GDC, come to our talk "Path Tracing Nanite in Zorah" tomorrow to learn more!
www.youtube.com/watch?v=5wbp...
Just 2 weeks until our #GDC25 talk "Path Tracing Nanite in NVIDIA Zorah". I'm excited to talk about how we're ray tracing insanely detailed Nanite geometry in real-time.
Add it to your schedule and come say hi: schedule.gdconf.com/session/path...
Add it to your schedule and come say hi: schedule.gdconf.com/session/path...
March 5, 2025 at 7:57 PM
Just 2 weeks until our #GDC25 talk "Path Tracing Nanite in NVIDIA Zorah". I'm excited to talk about how we're ray tracing insanely detailed Nanite geometry in real-time.
Add it to your schedule and come say hi: schedule.gdconf.com/session/path...
Add it to your schedule and come say hi: schedule.gdconf.com/session/path...
I'll be back at GDC this year!
I'm stoked for our talk: "Path Tracing Nanite in NVIDIA Zorah" with my colleagues Evan Hart and Jiayin Cao. We'll discuss RTX Mega Geometry, ReSTIR PT, and other goodness in our NvRTX branch of UE5 that powers Zorah.
Session: schedule.gdconf.com/session/path...
I'm stoked for our talk: "Path Tracing Nanite in NVIDIA Zorah" with my colleagues Evan Hart and Jiayin Cao. We'll discuss RTX Mega Geometry, ReSTIR PT, and other goodness in our NvRTX branch of UE5 that powers Zorah.
Session: schedule.gdconf.com/session/path...
February 11, 2025 at 9:33 PM
I'll be back at GDC this year!
I'm stoked for our talk: "Path Tracing Nanite in NVIDIA Zorah" with my colleagues Evan Hart and Jiayin Cao. We'll discuss RTX Mega Geometry, ReSTIR PT, and other goodness in our NvRTX branch of UE5 that powers Zorah.
Session: schedule.gdconf.com/session/path...
I'm stoked for our talk: "Path Tracing Nanite in NVIDIA Zorah" with my colleagues Evan Hart and Jiayin Cao. We'll discuss RTX Mega Geometry, ReSTIR PT, and other goodness in our NvRTX branch of UE5 that powers Zorah.
Session: schedule.gdconf.com/session/path...
Reposted by Adam Marrs
Game engines and shader stuttering: Unreal Engine's solution to the problem www.unrealengine.com/en-US/tech-b...
Game engines and shader stuttering: Unreal Engine's solution to the problem
Take a dive into Pipeline State Object (PSO) precaching and find out how this technique has evolved to the point that it now prevents most kinds of shader compilation stutters.
www.unrealengine.com
February 4, 2025 at 9:30 PM
Game engines and shader stuttering: Unreal Engine's solution to the problem www.unrealengine.com/en-US/tech-b...
Reposted by Adam Marrs
Thanks to a lot of colleagues' great work, happy to share Vulkan samples for RTX Mega Geometry. They should run on all RTX GPUs using today's new drivers
github.com/nvpro-sample...
github.com/nvpro-sample...
github.com/nvpro-sample...
github.com/nvpro-sample...
github.com/nvpro-sample...
github.com/nvpro-sample...
github.com/nvpro-sample...
github.com/nvpro-sample...
GitHub - nvpro-samples/vk_animated_clusters: Sample that uses VK_NV_cluster_acceleration_structure to animate meshes for ray tracing
Sample that uses VK_NV_cluster_acceleration_structure to animate meshes for ray tracing - nvpro-samples/vk_animated_clusters
github.com
January 30, 2025 at 2:09 PM
Thanks to a lot of colleagues' great work, happy to share Vulkan samples for RTX Mega Geometry. They should run on all RTX GPUs using today's new drivers
github.com/nvpro-sample...
github.com/nvpro-sample...
github.com/nvpro-sample...
github.com/nvpro-sample...
github.com/nvpro-sample...
github.com/nvpro-sample...
github.com/nvpro-sample...
github.com/nvpro-sample...
Our #GDC2024 talk on Real-Time Path Traced Light Transport in UE5 is now available on YouTube: www.youtube.com/watch?v=lxRg...
Making Connections: Real-Time Path-Traced Light Transport in Game Engines
YouTube video by GDC 2025
www.youtube.com
December 9, 2024 at 2:47 PM
Our #GDC2024 talk on Real-Time Path Traced Light Transport in UE5 is now available on YouTube: www.youtube.com/watch?v=lxRg...
GPU Zen 3 is out! $3 (Kindle version) is a ridiculously great deal for these interesting articles.
a.co/d/1VpahkV
a.co/d/1VpahkV
Amazon.com: GPU Zen 3: Advanced Rendering Techniques: 9798344236797: Engel, Wolfgang Friedrich, Reznikov, Laura, Kaplanyan, Anton S., Bazhenov, Kirill, Lopez, Nicolas, Sickachev, Peter, Bahnassi, Wess...
Amazon.com: GPU Zen 3: Advanced Rendering Techniques: 9798344236797: Engel, Wolfgang Friedrich, Reznikov, Laura, Kaplanyan, Anton S., Bazhenov, Kirill, Lopez, Nicolas, Sickachev, Peter, Bahnassi, Wess...
a.co
December 1, 2024 at 8:04 PM
GPU Zen 3 is out! $3 (Kindle version) is a ridiculously great deal for these interesting articles.
a.co/d/1VpahkV
a.co/d/1VpahkV