Illumination for computer generated pictures
Communications of the ACM
Volume illustration: non-photorealistic rendering of volume models
Proceedings of the conference on Visualization '00
Two-level volume rendering — fusing MIP and DVR
Proceedings of the conference on Visualization '00
Models of light reflection for computer synthesized pictures
SIGGRAPH '77 Proceedings of the 4th annual conference on Computer graphics and interactive techniques
Interactive translucent volume rendering and procedural modeling
Proceedings of the conference on Visualization '02
Importance-Driven Volume Rendering
VIS '04 Proceedings of the conference on Visualization '04
Vicinity Shading for Enhanced Perception of Volumetric Data
Proceedings of the 14th IEEE Visualization 2003 (VIS'03)
Curvature-Based Transfer Functions for Direct Volume Rendering: Methods and Applications
Proceedings of the 14th IEEE Visualization 2003 (VIS'03)
GPU-accelerated deep shadow maps for direct volume rendering
GH '06 Proceedings of the 21st ACM SIGGRAPH/EUROGRAPHICS symposium on Graphics hardware
The Occlusion Spectrum for Volume Classification and Visualization
IEEE Transactions on Visualization and Computer Graphics
IEEE Transactions on Visualization and Computer Graphics
Perception-Based Transparency Optimization for Direct Volume Rendering
IEEE Transactions on Visualization and Computer Graphics
Obscurance-based volume rendering framework
SPBG'08 Proceedings of the Fifth Eurographics / IEEE VGTC conference on Point-Based Graphics
VG'07 Proceedings of the Sixth Eurographics / Ieee VGTC conference on Volume Graphics
Feature enhancement using locally adaptive volume rendering
VG'07 Proceedings of the Sixth Eurographics / Ieee VGTC conference on Volume Graphics
A directional occlusion shading model for interactive direct volume rendering
EuroVis'09 Proceedings of the 11th Eurographics / IEEE - VGTC conference on Visualization
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Ambient occlusion techniques were introduced to improve data comprehension by bringing soft fading shadows. They consist in attenuating light by considering the occlusion resulting from the presence of neighboring structures. Recently introduced in volume rendering, we show that the straightforward application of ambient occlusion in direct volume rendering has its limits as rendering a multi-layer volume results in overdarkening the internal layers of the volume. This paper proposes to address the overdarkening issue by computing ambient occlusion according to the features present in the dataset. This allows us to neglect inter-occlusions between features without losing the auto-occlusions that give cues on the shape of the considered features. We use a GPU-based approach with bricking to speed up the computations of our ambient occlusion method. Results show that our approach not only improves the visual quality of images compared to classical ambient occlusion, but it is also less parametersensitive, thus furthermore improving usability for every-day users.