Decoupled Shading for Real-time Heterogeneous Volume Illumination

Existing real‐time volume rendering techniques which support global illumination are limited in modeling distinct realistic appearances for classified volume data, which is a desired capability in many fields of study for illustration and education. Directly extending the emission‐absorption volume...

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Bibliographic Details
Published in:Computer graphics forum 2016-06, Vol.35 (3), p.401-410
Main Authors: Zhang, Y., Ma, K.-L.
Format: Article
Language:English
Subjects:
Algorithms
Analysis
Categories and Subject Descriptors (according to ACM CCS)
Classification
Computer graphics
Education
Global illumination
high performance
I.3.7 [Computer Graphics]: Three-Dimensional Graphics and Realism
I.3.8 [Computer Graphics]: Applications
Illumination
Integrals
Light
Lighting
multi-material
multiple scattering
Real time
Rendering
Shading
soft shadow
Studies
volume rendering
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Description
Summary:Existing real‐time volume rendering techniques which support global illumination are limited in modeling distinct realistic appearances for classified volume data, which is a desired capability in many fields of study for illustration and education. Directly extending the emission‐absorption volume integral with heterogeneous material shading becomes unaffordable for real‐time applications because the high‐frequency view‐dependent global lighting needs to be evaluated per sample along the volume integral. In this paper, we present a decoupled shading algorithm for multi‐material volume rendering that separates global incident lighting evaluation from per‐sample material shading under multiple light sources. We show how the incident lighting calculation can be optimized through a sparse volume integration method. The quality, performance and usefulness of our new multi‐material volume rendering method is demonstrated through several examples.
ISSN:0167-7055
1467-8659
DOI:10.1111/cgf.12916