Nvidia is showing off a number of advancements in rendering, simulation and generative AI at Siggraph 2024.
Siggraph, the premier computer graphics conference, will take place from July 28 to Aug. 1 in Denver, Colorado.
And this year Nvidia Research will have more than 20 papers at the event, introducing innovations advancing synthetic data generators and inverse rendering tools that can help train next-generation models.
Nvidia said its AI research is making simulation better by boosting image quality and unlocking new ways to create 3D representations of real or imagined worlds.
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The papers focus on diffusion models for visual generative AI, physics-based simulation and increasingly realistic AI-powered rendering. They include two technical Best Paper Award winners and collaborations with universities across the U.S., Canada, China, Israel and Japan as well as researchers at companies including Adobe and Roblox.
These initiatives will help next-generation tools for developers and businesses to generate complex virtual objects, characters and environments. Synthetic data generation can then be harnessed to tell powerful visual stories, aid scientists’ understanding of natural phenomena or assist in simulation-based training of robots and autonomous vehicles.
Diffusion models improve texture painting, text-to-image generation
Diffusion models, a popular tool for transforming text prompts into images, can help artists, designers and other creators rapidly generate visuals for storyboards or production, reducing the time it takes to bring ideas to life.
Two Nvidia-authored papers are advancing the capabilities of these generative AI models. ConsiStory, a collaboration between researchers at Nvidia and Tel Aviv University, makes it easier to generate multiple images with a consistent main character — an essential capability for storytelling use cases such as illustrating a comic strip or developing a storyboard. The researchers’ approach introduces a technique called subject-driven shared attention, which reduces the time it takes to generate consistent imagery from 13 minutes to around 30 seconds.
Nvidia researchers last year won the Best in Show award at Siggraph’s Real-Time Live event for AI models that turn text or image prompts into custom textured materials. This year, they’re presenting a paper that applies 2D generative diffusion models to interactive texture painting on 3D meshes, enabling artists to paint in real time with complex textures based on any reference image.
Kickstarting developments in physics-based simulation
Graphics researchers are narrowing the gap between physical objects and their virtual representations with physics-based simulation — a range of techniques to make digital objects and characters move the same way they would in the real world.
Several Nvidia Research papers feature breakthroughs in the field, including SuperPADL, a project that tackles the challenge of simulating complex human motions based on text prompts.
Using a combination of reinforcement learning and supervised learning, the researchers demonstrated how the SuperPADL framework can be trained to reproduce the motion of more than 5,000 skills — and can run in real time on a consumer-grade Nvidia GPU.
Another Nvidia paper features a neural physics method that applies AI to learn how objects — whether represented as a 3D mesh, a NeRF or a solid object generated by a text-to-3D model — would behave as they are moved in an environment.
A paper written in collaboration with Carnegie Mellon University researchers develops a new kind of renderer — one that, instead of modeling physical light, can perform thermal analysis, electrostatics and fluid mechanics. Named one of five best papers at SIGGRAPH, the method is easy to parallelize and doesn’t require cumbersome model cleanup, offering new opportunities for speeding up engineering design cycles.
Additional simulation papers introduce a more efficient technique for modeling hair strands and a pipeline that accelerates fluid simulation by 10 times.
Raising the bar for rendering realism, diffraction simulation
Another set of Nvidia-authored papers present new techniques to model visible light up to 25 times faster and simulate diffraction effects — such as those used in radar simulation for training self-driving cars — up to 1,000 times faster.
A paper by Nvidia and University of Waterloo researchers tackles free-space diffraction, an optical phenomenon where light spreads out or bends around the edges of objects. The team’s method can integrate with path-tracing workflows to increase the efficiency of simulating diffraction in complex scenes, offering up to 1,000x acceleration. Beyond rendering visible light, the model could also be used to simulate the longer wavelengths of radar, sound or radio waves.
Path tracing samples numerous paths — multi-bounce light rays traveling through a scene — to create a photorealistic picture. Two Siggraph papers improve sampling quality for ReSTIR, a path-tracing algorithm first introduced by Nvidia and Dartmouth College researchers at Siggraph 2020 that has been key to bringing path tracing to games and other real-time rendering products.
One of these papers, a collaboration with the University of Utah, shares a new way to reuse calculated paths that increases effective sample count by up to 25 times, significantly boosting image quality. The other improves sample quality by randomly mutating a subset of the light’s path. This helps denoising algorithms perform better, producing fewer visual artifacts in the final render.
Teaching AI to think in 3D
Nvidia researchers are also showcasing multipurpose AI tools for 3D representations and design at Siggraph.
One paper introduces fVDB, a GPU-optimized framework for 3D deep learning that matches the scale of the real world. The fVDB framework provides AI infrastructure for the large spatial scale and high resolution of city-scale 3D models and NeRFs, and segmentation and reconstruction of large-scale point clouds.
A Best Technical Paper award winner written in collaboration with Dartmouth College researchers introduces a theory for representing how 3D objects interact with light. The theory unifies a diverse spectrum of appearances into a single model.
And a collaboration with University of Tokyo, University of Toronto and Adobe Research introduces an algorithm that generates smooth, space-filling curves on 3D meshes in real time. While previous methods took hours, this framework runs in seconds and offers users a high degree of control over the output to enable interactive design.
Nvidia at Siggraph
Nvidia will have a big presence at Siggraph, with special events including a fireside chat between Nvidia CEO Jensen Huang and Lauren Goode, senior writer at Wired, on the impact of robotics and AI in industrial digitalization.
Nvidia researchers will also present OpenUSD Day by Nvidia, a full-day event showcasing how developers and industry leaders are adopting and evolving OpenUSD to build AI-enabled 3D pipelines.
Nvidia Research has hundreds of scientists and engineers worldwide, with teams focused on topics including AI, computer graphics, computer vision, self-driving cars and robotics.
