Disney Enterprises, Inc.

Chaos Software Ltd.

Jaroslav Kr̆ivánek

Wojciech Jarosz

Derek Nowrouzezahrai

Iliyan Georgiev

Toshiya Hachisuka

Petr Vévoda

Ondr̆ej Karlík

Tomás̆ Skrivan

Martin Sik

Methods, systems, and apparatus, including computer programs encoded on computer storage media, for image rendering. One of the methods includes receiving data describing a scene, wherein the scene comprises one or more light sources and one or more objects having different surface optical properties; receiving a request to render an image of the scene using a multiple importance sampling method that combines a plurality of sampling techniques, wherein each sampling technique uses a different probability distribution to sample a respective fraction of total number of samples; modifying a particular one of the probability distributions to reduce a variance of the multiple importance sampling while holding the respective fractions and the other probability distributions fixed; rendering the scene using the multiple importance sampling using the modified particular probability distribution and the other probability distributions; and outputting the rendered scene in response to the request.

Rendering images using modified multiple importance sampling

Methods and systems of joint path importance sampling are provided to construct light paths in participating media. The product of anisotropic phase functions and geometric terms across a sequence of path vertices are considered. A connection subpath is determined to join a light source subpath with a light receiver subpath with multiple intermediate vertices while considering the product of phase functions and geometry terms. A joint probability density function ('PDF') may be factorized unidirectional or bidirectional. The joint PDF may be factorized into a product of multiple conditional PDFs, each of which corresponds to a sampling routine. Analytic importance sampling may be performed for isotropic scattering, whereas tabulated importance sampling may be performed for anisotropic scattering.

Methods and systems of joint path importance sampling

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Prague, Czechia

Jaroslav Kr̆ivánek