morgan @CasualEffects Twitter profile | Pikagi

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morgan

@CasualEffects

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Roblox Chief Scientist U.Waterloo & McGill Prof. @morgan3d .bsky Known for NVIDIA, Unity, Graphics Codex, Markdeep, G3D, Skylanders, E Ink, Titan Quest, Williams

Ontario, Canada

https://t.co/XZkzLBB5TK

Joined January 2012

Don't wanna be here? Send us removal request.

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@CasualEffects

morgan

3 years

The @Roblox metaverse connects 100s of millions of players in millions of games, with consistent personas. As Chief Scientist, I'm now leading computer-, data-, and social-science research to continue Roblox's innovation for coexperience, creativity, safety, and digital civility.

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@_tim_brooks

@CasualEffects

morgan

11 months

It wasn't until I'd *taught* algorithms a few times that I finally understood why sorting is in the CS curriculum. Unfortunately, most curricula don't explain this! It is NOT because sorting is an important algorithm to learn to implement...

@ryanrwinchester

Ryan Winchester

@ryanrwinchester

11 months

As a 41 year-old software developer do you know how many times I've had to manually implement QuickSort? Zero. Maybe we should test for more useful skills like taking a slow SQL query and optimizing it.

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@CasualEffects

morgan

3 years

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@CasualEffects

morgan

5 years

Human latency

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@CasualEffects

morgan

11 months

By using different sort algorithms as a running example, we can cover ideas such as: - Asymptotic analysis - Space vs. time tradeoffs - Best case vs. worst case vs. expected case behavior - Functional vs. imperative implementations - Explicit stack vs. recursive implementations

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@CasualEffects

morgan

11 months

We teach sorting in algorithms classes because it is a simple and easy to motivate EXAMPLE of different algorithms for accomplishing the same task. The solution isn't the point in the classroom. The problem is the point...

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@CasualEffects

morgan

11 months

In conclusion, the point of the sorting lectures you had in college was the lessons you learned along the way, not the sorting. I'm really sorry we didn't tell you that at the time!

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@CasualEffects

morgan

3 years

I'm excited to announce in partnership with the @NVIDIA Deep Learning Institute that the Graphics Codex is now a free online computer graphics rendering and ray tracing textbook at The programming projects run everywhere and are accelerated on RTX GPUs.

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@CasualEffects

morgan

11 months

- Stable vs. unstable - Adversarial cases - Concurrency As a bonus, we can also point out that if you give your algorithm a cool name like "QuickSort", then generations of programmers will naively assume that it is the fastest sorting algorithm and use it...

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@CasualEffects

morgan

10 months

Note that Roblox uses the Right Handed, Y=Up 3D category. It matches the intuition you probably have from learning coordinates when graphing in school, follows my favorite textbooks, and plays nice with cross products: X × Y = Z; Y × Z = X; Z × X = Y.

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@CasualEffects

morgan

11 months

As a professor, scientist, programmer, game developer, etc. what sorting algorithm do I use? WHATEVER SORT IS IN MY STANDARD LIBRARY ...

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@CasualEffects

morgan

6 years

just changed my programming life. Suddenly regexps aren't write-only expressions...

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@CasualEffects

morgan

3 years

I'm now Director of Hyperscale Graphics Systems research at NVIDIA! And my team is hiring PhD interns and senior scientist/engineer positions right now (thread):

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@CasualEffects

morgan

11 months

I'm amazed that the debugging experience circa 2000 in C++ with Visual Studio or CodeWarrior (or even xgdb) was more sophisticated than now with Python, JavaScript, and various GPU languages. We're really back to working with "printf" a lot instead of visual debugging.

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@CasualEffects

morgan

11 months

It isn't even because programmers will need to know the tradeoffs between different sorting algorithms to choose one (99% of the time)...

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@CasualEffects

morgan

3 years

It's my last day at @nvidia , a great company made by great people. Thanks for an amazing 12 years of collaboration accelerating ray tracing, AI, raster VFX, XR, esports, perceptual, and datacenter graphics. I look forward to everything the green team creates next! #76B900

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morgan

11 months

Very, very, very occasionally, sorting performance or behavior matters so much for a specific application that I need think about it for a total of five minutes. And then I use: the radix sort THAT IS IN MY STANDARD LIBRARY. ...

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@CasualEffects

morgan

5 years

Slides and transcript for "Ray Tracing a Procedural Planet", with links to all of the code. An easy and inspirational introduction to procedural landscape generation.

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morgan

11 months

Unfortunately, what we've also done by using this convenient example of sorting and its many possible solutions is created generations of programmers who mistakenly think that sorting is an important open problem or something that matters for performance very often.

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morgan

2 years

I'm pleased to publicly introduce for the first time the members of the #Roblox research team:

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Spotlight on Roblox Research - Roblox Blog

Showcasing some of the leaders of the Roblox Research team as they accelerate our mission to connect a billion people with optimism and civility.

blog.roblox.com

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@CasualEffects

morgan

6 years

Buy The Graphics Codex for only $10. Hundreds of detailed entries, a full book on rendering physically-based lighting and materials, and coding projects to learn computer graphics from scratch on Windows, Linux, or Mac.

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@CasualEffects

morgan

8 years

Introducing the Graphics Codex Programming Projects. 11 labs to teach yourself 3D graphics.

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@CasualEffects

morgan

3 years

Ivan Sutherland cofounded one of the most important 3D graphics companies, received a Turing award, and contributed fundamental work on hardware accelerated graphics, CAD, HCI, and VR. One of his contributions less well known outside of academia is...

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@CasualEffects

morgan

11 months

That said, heap sort in C is my favorite sort, just because it has a wicked cool implementation. But this is like Rubik's Cube or my favorite ice cream: it is neat, I like it, and it has zero to do with actual software development. ...

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@CasualEffects

morgan

1 year

Just released on #Roblox : AI Material Generator! Create full PBR materials directly from text prompts. You can control variations, iterate, and change the scale.

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@CasualEffects

morgan

9 years

I just released Markdeep http://t.co/Iqk5YDMaQd. It is like Markdown on steroids, with client-side viewing. http://t.co/DciqIIkQT8

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morgan

3 years

I'm sharing my shadertoy ray tracing experiment framework, which I'd unintentionally kept private all this time! It includes extensible abstractions, FXAA, reflections, environment map, shadows, and minimalist physically-based materials.

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@CasualEffects

morgan

2 years

Have to say, decades in the games industry have made me somewhat skeptical of the potential of "no code" programming.

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@CasualEffects

morgan

2 years

Impressed with deep neural networks as the new hotness? Here's John von Neumann in 1956:

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@CasualEffects

morgan

5 years

You'd think game engine programming is all hot-shot graphics optimization, but really it is: - Motion vectors are wrong again - Alpha test is broken - Shader errors are off by one line - The hash table destructor takes that much time?!? - Ha ha, look at this physics bug.

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@CasualEffects

morgan

6 years

Apple drops OpenGL --> Autodesk drops Apple

Discontinuation of Mac Support for Autodesk Alias and VRED

Which macOS versions are supported for Alias and Vred. What is changing for Autodesk VRED and Alias version support for macOS? After July 13, 2018, Autodesk will no longer provide new Mac versions of...

www.autodesk.com

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morgan

2 years

I'm in my third decade of programming, and am astonished to keep finding that the most portable, write-once-run-everywhere language in 2022 is still...well-written C or C++ code.

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@CasualEffects

morgan

6 years

Full source code and precompiled Windows binary demo for "Combining Analytic Direct Illumination and Stochastic Shadows" I3D'18 best paper ( @eric_heitz , @self_shadow , and @CasualEffects collaboration)

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@CasualEffects

morgan

11 months

Talking to @KreekCraft today about streaming on #Roblox and the empowering creators on our platform.

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@CasualEffects

morgan

5 years

At GDC'19 I'll present a new high-performance ray traced global illumination solution for games using RTX: Developed by NVIDIA, McGill University, and the Université de Montréal.

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morgan

5 years

5 hours in and I've hit the dreaded "bring out the real-life crate of spheres" point in debugging the renderer...

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@CasualEffects

morgan

4 years

My new video conference background at NVIDIA.

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morgan

4 years

The RTXGI SDK we described at SIGGRAPH is now publicly available. RTXGI accelerates ray tracing on all DirectX Ray Tracing GPUs at runtime and streamlines artist workflows. Full dynamic GI for your game without noise, UV maps, or manual probe placement.

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@CasualEffects

morgan

6 years

@swainrob @erkaman2 A great sequence for learning rendering for 3D graphics is: 0. Calculus and C++ programming (1 year, prereq) 1. Rendering in One Weekend 1, 2, 3 (5 days) 2. Graphics Codex (3 weeks) 2. RTR4 + Vulkan or DX12 & PBRT (years) Time estimates are coding time for the projects.

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morgan

3 years

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morgan

5 years

Ray tracing isn't just about reflections and RTX. Here are just a few things you can do with 100k rays/frame on CPU or GPU compute shaders...on GTX GPUs, non-NVIDIA GPUs, and even CPUs.

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morgan

4 years

The Graphics Codex programming projects now run on Jetson Nano . That means you can get a cute computer with a real NVIDIA GPU for US$99 and learn C++ and 3D programming on it! This is great for hobbyists, homeschooled teens, and low-cost teaching labs.

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morgan

5 years

Chapter 15 of Computer Graphics: Principles and Practice is free online: This is a deep dive (64 pages with code!) on the differences and enough information to implement each in software from scratch.

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morgan

9 years

I have ASCII art in design docs and code comments like this; seeing them rendered correctly by Markdeep is magic! http://t.co/41bIFVgt6n

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morgan

8 months

Roblox is free for developers. The IDE, the code editor, the version control system, the 3D engine, the servers, the matchmaking server, the translation service, the moderation service, Android, iOS, Windows, macOS, PS4, PS5, Xbox, and Quest.

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morgan

5 years

NVIDIA Dynamic Diffuse Global Illumination (DDGI) GDC talk now free in the GDC vault. Here's the link without the registration wall:

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morgan

5 years

Final build of my 64x64 space dogfighting #lowrezjam game now online at: Future hobby development continuing, but may surpass the jam's resolution limits.

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morgan

2 years

This month Roblox Studio's music catalog will receive 100,000 new licensed songs, plus 100,000 new licensed sound effects from APM, Monstercat, Pro Sound Effects, Nettwerk Music Group, Position Music, and others that are free for creators to use on the platform.

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@CasualEffects

morgan

8 months

Wait until the ML research community learns about the Dreams renderer, as they work their way from SDF rendering to volume rendering to point rendering....

@TweetEdMiller

Edward Miller

8 months

👀

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morgan

4 years

Windows 10 puts a fake python/3 executable in the path, ahead of the actual python. This breaks scripts and has caused me problems on nearly every cross-platform project I work on. The fake executable redirects to the Windows store:

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Who put Python in the Windows 10 May 2019 Update? - Python

Python might be hard to install on Windows, but with the latest Windows 10 update, you can type "python" to find it in the Microsoft Store.

devblogs.microsoft.com

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@CasualEffects

morgan

4 years

Whoa....

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@CasualEffects

morgan

3 years

Preprint of our new @UWaterloo graphics research paper, McGuire & Mara, MMPX Style-Preserving Pixel Art Magnification, 2021 Paper: Demo:

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@CasualEffects

morgan

2 years

A Dataset and Explorer for 3D Signed Distance Functions, JCGT'22 @yongyuanxi / @AndrewGlassner / @casualeffects Normalized, optimized, & categorized analytic SDFs + sample point sets. Perf. benchmarks, NeRF/DeepSDF-style AI without error from meshes, etc.

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morgan

8 years

100% procedural low-poly landscape generator as a solution to the Geometry Design project:

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morgan

7 years

TOP BURN A #pico8 1k jam: a full 3D game in 1024 characters.

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morgan

5 years

Intro to computer graphics summarized in one slide deck from our review lecture: See for the full explanations.

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morgan

4 years

@AmazingThew Something life changing I learned early at NVIDIA is that "putting something in hardware" (creating an application-specific integrated circuit, ASIC) usually does not make a program faster. (thread):

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morgan

5 years

Best explanation I've seen yet of this relative color phenomena. I had to take it into Photoshop to trust the image...it is correct.

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morgan

6 years

Ryan Brooks "octahedral impostors" gives shockingly good LOD and prefiltering, at least for cartoony trees. I think this is a very important direction for combating aliasing as well producing scalability.

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morgan

5 years

The quadplay✜ fantasy console is now free & open source. Play, download, and create games at

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morgan

5 years

My nano+quadplay fantasy console now analyzes your source code and draws a state machine for your game in the IDE.

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morgan

5 years

Dreams on PS4 might be the most positive development ever in gaming. The vibe of anything is possible, creativity, and new worlds to discover is something I haven't felt since the early beta of Minecraft, and before that not since childhood gaming when everything was new.

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morgan

4 years

A small change to your ray tracer's random number sampler can eliminate most noise from large area lights.

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morgan

7 years

Done with the tiny planet shader! Implicit surface land and sea, with a ray-marched cloud density function.

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morgan

5 years

Indirect lighting in God of War (2018)

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morgan

5 years

How I read a graphics research paper:

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morgan

8 years

SIGGRAPH'16 Real-Time Transparency Talk video: (physically-based rendering gets hardcore!)

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morgan

5 years

I updated my Tiny Planet shader in preparation for a ProcGen talk this week:

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morgan

3 years

New work with @yongyuanxi , @JoeyLitalien , @FidlerSanja , @DerekRenderling , @_AlecJacobson , Kangxue Yin, Karsten Kreis, & Charles Loop: Neural Geometric Level of Detail: Real-time Rendering with Implicit 3D Shapes, 2021

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morgan

3 years

Hands down gorgeous...but as a recovering rendering nerd, I'm just blown away that the power lines don't alias and the road texture doesn't repeat.

@NVIDIAGeForceFR

NVIDIA GeForce FR

@NVIDIAGeForceFR

3 years

Gameplay de Forza Horizon 5 👀

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morgan

6 years

I just discovered that W only comes after Z in the alphabet if you're a 3D graphics programmer. To everyone else, the sequence "x, y, z, w" sounds really weird.

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morgan

6 years

Welcome to ray tracing and the new hybrid future of real-time graphics. Games will now keep the amazing performance of rasterization methods and add the quality of ray tracing. With DXR, GPU ray tracing just became mainstream.

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Announcing Microsoft DirectX Raytracing! - DirectX Developer Blog

If you just want to see what DirectX Raytracing can do for gaming, check out the videos from Epic, Futuremark and EA, SEED. To learn about the magic behind the curtain, keep reading. 3D Graphics is...

devblogs.microsoft.com

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morgan

6 years

I've been coding for VR for almost two decades, and I still find this stupidly funny as a programmer in-joke every time that I type it: for (int eye = 0; eye < 2; ++eye) { ... }

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morgan

5 years

Now available: Majercik et al, Dynamic Diffuse Global Illumination with Ray-Traced Irradiance Fields, JCGT 2019 A noise-free, robust, and efficient dynamic irradiance approximation targeting global illumination for games.

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morgan

6 years

Shaved yak game jam: 1. Create a new fantasy console 2. New language & compiler 3. New documentation system for the console 4. Make engine 5. Assets 6. Write short, elegant game

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morgan

2 years

Wow, Blender got really good in the past decade, huh?

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morgan

4 years

NVIDIA is a great company to work at.

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morgan

7 years

I've gone too far...minimal flight game in 243 characters + 6 sprites for #pico8 .

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morgan

7 years

My GDC talk on light field probes is now online: Full paper & code:

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morgan

3 years

It is relatively easy to write a compiler. It is challenging and requires about 5x as much code to write a compiler that gives useful error messages, because you structure it differently when you need to retain state and history. This applies to most tools programming as well!

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morgan

5 years

You can have a great software career without a computer science *degree*. But that *knowledge* is essential at high levels of system building and you need to gain it somehow, if not at a university. CS isn't elitist academic credentialing. It is practical science and engineering:

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morgan

4 years

I just wrote a line of Python that generates a line of JavaScript that produces a line of HTML that embeds a JavaScript program that compiles a Python program and runs it in a browser...without irony.

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morgan

5 years

At #SIGGRAPH 2019, @Peter_shirley , @_cwyman_ , and I are teaming up to teach a unified Intro to Real-Time Ray Tracing course. If you're a game or hobby programmer with no ray tracing experience, we'll teach you parallel ray tracing in 3 hours. Can't wait? See the replies...

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morgan

8 years

How to pronounce technical terms in graphics in English: e.g., skip the "s" in Fresnel!

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morgan

3 years

This is one case of a general set of really handy math tricks. I'll explain what's going on at an intuitive level in this thread and give the other tricks. Transformation matrices compose by multiplication: applying transform B to A to vector B is B * A * v. ...

@mmalex

𝖒𝖒𝖆𝖑𝖊𝖝

3 years

TIL (from , who is not on twitter afaik) if you interpolate camera matrices in log space, the center of rotation is preserved. this is awesome for smoothing camera paths and I cant believe I didnt do this before. may this tweet make you less dumb than me

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morgan

5 years

Today is my last as a professor at Williams College, after 12 terrific years teaching CS, game design, and film & media studies in the purple valley. I've migrated my research and open source to and will be moving course materials soon.

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morgan

6 years

Super fast perceptual color difference for 8-bit sRGB

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morgan

3 years

Or, you could make a table with three legs.

@Rainmaker1973

Massimo

3 years

NOROCK is a table which provides a solution to table instability through a mechanical self-stabilization system [video: ] [more: ]

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morgan

4 years

Krita has become a very good free, open source paint program on Windows, Linux, and Mac:

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morgan

6 years

Maybe it's time you got up to speed on ray tracing. If you don't know where to start, don't worry, we've got you covered! Here are three books to take you from zero to the speed of light:

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morgan

7 years

Presentation slides and reference code for Light Field Probes I3D'17 now online:

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morgan

4 years

This is not video of a tennis match (notice that the background is static and the players cast no shadows). It is synthesized video of character sprites that are controlled by players, creating a near-photorealistic game [...of Pong 😀].

@_akhaliq

AK

4 years

Vid2Player: Controllable Video Sprites that Behave and Appear like Professional Tennis Players pdf: abs: project page:

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morgan

2 years

I'm excited to share the news of Roblox’s acquisition of Byfron, leader in anti-cheat tech. Our latest move to make Roblox the best platform for our community through industry-leading technology for our creators. Welcome, @ByfronTech !

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Welcoming Byfron to Roblox

Developers, We know how important anti-cheat and security are for you and the entire Roblox community. At RDC, we announced that we’re turning our focus to cheat prevention. To help get us there,...

devforum.roblox.com

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morgan

6 years

As a graphics geek, I always enjoy the AO greeble kitbash version of movies at least as much as the final frames. e.g., Blade Runner 2049, SW:TFA, Inception, Wonder Woman

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morgan

3 years

Working on Roblox has radically changed my mind about "no code"/"low code" programming. I still feel that traditional programming is the right approach for most software development and language and tools improvements are the best way to accelerate it, but...

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morgan

3 years

I use 7 main ray generation shaders across projects from video game rendering to light field displays. @zandermajercik and I will release these as public domain in Ray Tracing Gems 2 for everyone to use. Thanks to @acmarrs , @Peter_shirley , and @IngoWald for editing!

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morgan

1 year

@JedDevs @MaximumADHD @Quenty @grilme99 We've come a long way, baby! [My 2005 test place on the left, 2023 Winds of Fortune on the right]

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morgan

5 years

If most of your attempts don't fail, then you aren't trying hard enough. Good artists/writers/engineers/scientists/etc. don't just have good ideas. They also iterate through the mediocre ones very quickly to get them out of the way.

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morgan

5 years

@tom_forsyth Ah, the dreaded "if loop"

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morgan

6 years

Denoising is exciting so many of us in graphics research because it is the key to rendering film quality visuals in real time. Denoising = 1000x speedup for path tracing Path tracing = 10x AAA game visual quality, at 1/100x artist & code cost

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NVIDIA OptiX™ AI-Accelerated Denoiser

developer.nvidia.com

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