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.