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Related Experiment Video

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Large Volume, Behaviorally-relevant Illumination for Optogenetics in Non-human Primates

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Published on: October 3, 2017

Historygrams: Enabling Interactive Global Illumination in Direct Volume Rendering using Photon Mapping.

D Jonsson¹, J Kronander, T Ropinski

¹Linkoping University, Sweden. daniel.jonsson@liu.se

IEEE Transactions on Visualization and Computer Graphics

|September 11, 2015

Summary

This summary is machine-generated.

This study introduces interactive global illumination for volume rendering using photon mapping. It enables real-time editing of transfer functions and materials by efficiently reusing computations with Historygrams.

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Area of Science:

Computer Graphics
Scientific Visualization

Background:

Direct volume rendering (DVR) requires interactive parameter exploration, crucial for understanding complex datasets.
Advanced global illumination techniques are often too computationally intensive for interactive applications.

Purpose of the Study:

To enable interactive global illumination in volume rendering by extending photon mapping.
To support real-time editing of transfer functions (TF) and material properties.

Main Methods:

Novel algorithms and data structures for efficient photon map updates during parameter changes.
Introduction of Historygrams to reuse previously computed photon-medium interactions.
View-ray segmentation and independent updates based on light transport equations.

Main Results:

Significantly decreased computation for parameter changes in photon mapping.
Efficient identification and reuse of valid photon interactions using Historygrams.
Support for interactive editing of TFs and materials in volumetric photon mapping.

Conclusions:

The developed technique facilitates interactive exploration of volume data with global illumination.
Enables handling of complex lighting scenarios like arbitrary light sources and multiple scattering in interactive DVR.
Advances the state-of-the-art in real-time scientific visualization and rendering.