Display of Surfaces from Volume Data
IEEE Computer Graphics and Applications
Evaluating stereo and motion cues for visualizing information nets in three dimensions
ACM Transactions on Graphics (TOG)
A non-photorealistic lighting model for automatic technical illustration
Proceedings of the 25th annual conference on Computer graphics and interactive techniques
Adding shadows to a texture-based volume renderer
VVS '98 Proceedings of the 1998 IEEE symposium on Volume visualization
Interactive technical illustration
I3D '99 Proceedings of the 1999 symposium on Interactive 3D graphics
Illumination for computer generated pictures
Communications of the ACM
Multidimensional Transfer Functions for Interactive Volume Rendering
IEEE Transactions on Visualization and Computer Graphics
Perceiving Spatial Relationships in Computer-Generated Images
IEEE Computer Graphics and Applications
A Model for Volume Lighting and Modeling
IEEE Transactions on Visualization and Computer Graphics
VIS '91 Proceedings of the 2nd conference on Visualization '91
An evaluation of depth perception on volumetric displays
Proceedings of the working conference on Advanced visual interfaces
Texturing of Layered Surfaces for Optimal Viewing
IEEE Transactions on Visualization and Computer Graphics
Photoshop LAB Color: The Canyon Conundrum and Other Adventures in the Most Powerful Colorspace
Photoshop LAB Color: The Canyon Conundrum and Other Adventures in the Most Powerful Colorspace
Using NPR to evaluate perceptual shape cues in dynamic environments
Proceedings of the 5th international symposium on Non-photorealistic animation and rendering
Implicit visibility and antiradiance for interactive global illumination
ACM SIGGRAPH 2007 papers
GPU-Based Monte-Carlo Volume Raycasting
PG '07 Proceedings of the 15th Pacific Conference on Computer Graphics and Applications
The assumed light direction for perceiving shape from shading
Proceedings of the 5th symposium on Applied perception in graphics and visualization
IEEE Transactions on Visualization and Computer Graphics
From obscurances to ambient occlusion: A survey
The Visual Computer: International Journal of Computer Graphics
Perceptual influence of approximate visibility in indirect illumination
ACM Transactions on Applied Perception (TAP)
Effects of global illumination approximations on material appearance
ACM SIGGRAPH 2010 papers
Local Ambient Occlusion in Direct Volume Rendering
IEEE Transactions on Visualization and Computer Graphics
Technical Section: Viewpoint information channel for illustrative volume rendering
Computers and Graphics
An analytical model for skylight polarisation
EGSR'04 Proceedings of the Fifteenth Eurographics conference on Rendering Techniques
Interactive global light propagation in direct volume rendering using local piecewise integration
SPBG'08 Proceedings of the Fifth Eurographics / IEEE VGTC conference on Point-Based Graphics
A multidirectional occlusion shading model for direct volume rendering
EuroVis'10 Proceedings of the 12th Eurographics / IEEE - VGTC conference on Visualization
A directional occlusion shading model for interactive direct volume rendering
EuroVis'09 Proceedings of the 11th Eurographics / IEEE - VGTC conference on Visualization
Streamlines for illustrative real-time rendering
EuroVis '13 Proceedings of the 15th Eurographics Conference on Visualization
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Soft shadows are effective depth and shape cues. However, traditional shadowing algorithms decrease the luminance in shadow areas. The features in shadow become dark and thus shadowing causes information hiding. For this reason, in shadowed areas, medical illustrators decrease the luminance less and compensate the lower luminance range by adding color, i.e., by introducing a chromatic component. This paper presents a novel technique which enables an interactive setup of an illustrative shadow representation for preventing overdarkening of important structures. We introduce a scalar attribute for every voxel denoted as shadowiness and propose a shadow transfer function that maps the shadowiness to a color and a blend factor. Typically, the blend factor increases linearly with the shadowiness. We then let the original object color blend with the shadow color according to the blend factor. We suggest a specific shadow transfer function, designed together with a medical illustrator which shifts the shadow color towards blue. This shadow transfer function is quantitatively evaluated with respect to relative depth and surface perception.