NVIDIA Brings AI to Ray Tracing to Speed Graphics Workloads
Good design is obvious: You know it when you see it.
What’s less apparent is the amount of trial and error behind the process to achieve it. Designers, manufacturers and other creative types have to try multiple variations of an idea. Each time they render an image, then they examine, adjust, validate and try yet another variation.
The more time they have to iterate, the better the final outcome. Of course, time is money, and deadlines loom.
NVIDIA CEO and founder Jensen Huang showed at the GPU Technology Conference today how NVIDIA is advancing the iterative design process to accurately predict final renderings by applying artificial intelligence to ray tracing. (Ray tracing is a technique that uses complex math to realistically simulate how light interacts with surfaces in a specific space.)
The ray tracing process generates highly realistic imagery but is computationally intensive, and can leave a certain amount of noise in an image. Removing this noise while preserving sharp edges and texture detail, is known in the industry as denoising. Using NVIDIA Iray, Huang showed how NVIDIA is the first to make high-quality denoising operate in real time by combining deep learning prediction algorithms with Pascal architecture-based NVIDIA Quadro GPUs.
It’s a complete gamechanger for graphics-intensive industries like entertainment, product design, manufacturing, architecture, engineering and many others.
The technique can be applied to ray-tracing systems of many kinds. NVIDIA is already integrating deep learning techniques to its own rendering products, starting with Iray.
How Iray Interactive Denoising Works
Existing algorithms for high-quality denoising consume seconds to minutes per frame, which makes them impractical for interactive applications.
By predicting final images from only partly finished results, Iray AI produces accurate, photorealistic models without having to wait for the final image to be rendered.
Designers can iterate on and complete final images 4x faster, for a far quicker understanding of a final scene or model. The cumulative time savings can significantly accelerate a business’s go-to-market plans.
To achieve this, NVIDIA researchers and engineers turned to a class of neural networks called an autoencoder. Autoencoders are used for increasing image resolution, compressing video and many other image processing algorithms.
Using the NVIDIA DGX-1 AI supercomputer, the team trained a neural network to translate a noisy image into a clean reference image. In less than 24 hours, the neural network was trained using 15,000 image pairs with varying amounts of noise from 3,000 different scenes. Once trained, the network takes a fraction of a second to clean up noise in almost any image — even those not represented in the original training set.
With Iray, there’s no need to worry about how the deep learning functionality works. We’ve already trained the network and use GPU-accelerated inference on Iray output. Creatives just click a button and enjoy interactivity with the improved image quality with any Pascal or better GPU.
Iray deep learning functionality will be included with the Iray SDK we supply to software companies, and exposed in Iray plugin products we produce later this year. We also plan to add an AI mode to NVIDIA Mental Ray. We expect renderers of many kinds to adopt this technology. The basis of this technique will be published at the ACM SIGGRAPH 2017 computer graphics conference in July. Learn more here.