Image Synthesis using Adjoint Photons. Motivation Participating Media Simplify Importance Sampling Support Wavelength Dependence.

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Presentation transcript:

Image Synthesis using Adjoint Photons

Motivation Participating Media Simplify Importance Sampling Support Wavelength Dependence

Participating Media

Ray Marching Result

Media as Probabilistic Entity

Probabilistic Media Example

Probabilistic Media Example 2

Rendering Comparison

Traversal Comparison

Software Impact Probabilistic media act like surfaces –Subclass them from Surface No volume pass after surface shading Separates intersection and shading

Shading Kernels Surfaces: Volumes:

Simplify Importance Sampling Remove Separation of Direct/Indirect Multiple Importance Sampling (MIS) Consistent Sampling Domain

Direct vs Indirect

Multiple Importance Sampling Impressive variance reduction Requires ability to request pdf arbitrarily Can lead to high branching

Mixture Densities Simplest combined sampling Similar performance to branched MIS

Tagged Objects

Wavelength Dependence Photons have individual wavelengths Scattering depends on wavelength Color Noise

Physical Sun and Sky

The Full System

Limitations

Acknowledgments State of Utah Center of Excellence NSF Grant Barry M. Goldwater Foundation

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