Papers by Magnus Wrenninge

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Production Volume Rendering

Julian Fong, Magnus Wrenninge, Christopher Kulla, Ralf Habel
July 2017

This course provides an overview of production volume rendering, focused on path tracing. The course will describe practical fundamentals for adding volume rendering to an existing path tracer, cover a complete range of volume integration scenarios and techniques, and describe in detail recent production-proven techniques for optimizing volume rendering.

Paper (PDF)

SIGGRAPH 2017 Course Notes

Path Traced Subsurface Scattering using Anisotropic Phase Functions and Non-Exponential Free Flights

Magnus Wrenninge, Ryusuke Villemin, Christophe Hery
July 2017

With the recent move to path tracing for both surface and volume rendering, subsurface scattering has been one of the last light transport modes to rely on empirical or approximate models. Although rendering of subsurface scattering using path tracing is conceptually simple, making the model artist friendly is not. Our new ... more

Paper (PDF)

Additional materials: [PTSSSAlbedoInversionCoeffs.txt]

Available as Pixar Technical Memo #17-07

Efficient Unbiased Rendering of Thin Participating Media

Ryusuke Villemin, Magnus Wrenninge, Julian Fong
September 2018

In recent years, path tracing has become the dominant image synthesis technique for production rendering. Unbiased methods for volume intergration have followed, and techniques such as delta tracking, ratio tracking and spectral decomposition tracking are all in active use, and this paper is focused on optimizing the underlying mechanics ... more

Paper (PDF)

Art and Technology at Pixar (SIGGRAPH Asia 2018 Course)

Ryusuke Villemin, Chia-Chi Hu, Sonoko Konishi, Hiroaki Narita, Magnus Wrenninge, David Yu
December 2018

As described by this now famous quote "The art challenges technology, and the technology inspires art", technology has always played an important part in Pixar's movie making process. This course will show how we develop and utilize new technical advancements to tell more appealing stories, using real-world examples from our latest movie Incredibles ... more

Paper (PDF)

SIGGRAPH Asia 2018 Course

Product Importance Sampling of the Volume Rendering Equation using Virtual Density Segments

Magnus Wrenninge, Ryusuke Villemin
January 2020

We propose a new volumetric integration method that combines guiding of candidate point positions and importance resampling. We refer to this as the virtual density segment method (VDS). In particular, we show that this control can be driven by treating invertible PDFs as virtual density sources, which in turn ... more

Paper (PDF)

Available as Pixar Technical Memo #20-01