08 depth occlusion - University of Victoria · 2010-01-27 · Visual Layering • Why would we want...
Transcript of 08 depth occlusion - University of Victoria · 2010-01-27 · Visual Layering • Why would we want...
Depth / Occlusion / Layering
Visual Layering
• Why would we want visual layers? • How to create them?
Visual Clutter
Subtle background
Aside: Parallel Coordinates
[http://peltiertech.com/WordPress/sample-parallel-coordinate-chart/]
Layering in Parallel Coordinates
Johansson et al. InfoVis 2005
Hierarchical Edge Bundling
Alpha-blending
Bundling strength
Monocular depth cues
Occlusion
http://ccrs.nrcan.gc.ca/resource/tutor/stereo/chap2
Monocular depth cues
Retinal image size
(larger appears closer)
Perspective projection
http://ccrs.nrcan.gc.ca/resource/tutor/stereo/chap2
Monocular depth cues
Haziness
(Distant objects blurred)
Depth of field
http://ccrs.nrcan.gc.ca/resource/tutor/stereo/chap2 http://www.seemsartless.com/guides/camera-dof.php
Monocular depth cues
http://profron.net/visuals/Depth/ Shape from shading
Shadows
Monocular depth cues
Accomodation
(eye muscle movement)
http://ccrs.nrcan.gc.ca/resource/tutor/stereo/chap2
Structure from motion
http://bigbird.psych.purdue.edu/shapedemo/
Binocular depth cues
Convergence
(amount eyes rotate to center)
Binocular disparity
(difference between retinal images)
http://ccrs.nrcan.gc.ca/resource/tutor/stereo/chap2
Artificial cue: drop lines
Smallman et al. CG&A 21(5), 2001
3D Visualization Examples
• What is 3D good for? • Not so good for?
www.ablesw.com/3d-doctor/volume.html
www.interstudio.net
Cone Trees
Data Mountain
GeoTime, Kapler & Wright, InfoVis 2004.
3D for transitions?
ScatterDice, Elmqvist et al., InfoVis 2008.
3D for transitions?
Parallel Coordinates and Star Glyphs, Fanea et al., InfoVis 2005.