3D

1
3-D

• cs5984 Information Visualization
• Chris North

2
Last Week

• Virtual Environments
• 3-D manipulation, navigation, immersion
• Scientific Visualization
• Data Flow?
• Peripheral Displays
• Primary and secondary tasks, attention

3
Today

• DeFanti, Scientific Visualization, pg 39
• Sayle, Rasmol, web
• Yuying, Matt

4
3-D Data

• Vector/Polygonal surface data
• Polygons approximate surfaces of 3D objects
• Paint textures on surfaces
• E.g Rasmol, Quake
• Navigation
• Move camera
• Move objects
• 6 dof
• 3 rotation
• 3 translation

5
3-D Data
2-D

• Voxel volume data
• Fully sampled contents of 3D objects
• Voxel 3D pixel point in a 3D image
• E.g Visible Human, MRI, CaT scan
• Visible Human
• slice and photograph
• MRI CaT
• Measures tissue density at each point in space
• Navigation?

3-D
6
Slicing

• Visible Human Explorer (north et al)
• Video?
• Demo?

7
Slice and Dice
8
Image Segmentation

• Determine physical structures within volume
• Manual
• Image processing
• Generate surfaces

9
Image Segmentation

• Voxel-Man
• Hamburg University
• http//www.uke.uni-hamburg.de/institute/imdm/idv/v
  m3dn/io_thorax.en.html

10
Transparency

• Reduce occlusion problem
• http//www.uke.uni-hamburg.de/institute/imdm/idv/v
  m3dn/io_xray_combined.en.html

11
3-D data Digital Video

• 3D Stack 2D video frames

time
y
x
12
Slicing Digital Video
Full overview
time
zoom

• Reds Nightmare video in VHE

motion
Scene change
Pan left
still
credits
13
Assignment

• Read for Thurs Workspaces
• Gelernter, LifeStreams, web
• fanye, luhui
• Robertson, Task Gallery, web
• priya, dilshad
• Read for Tues Construction
• Hibino, InfoStill, web
• gowri, joy
• Haeberli, Data Flow, web
• ajay, denzil

14
Future

• OD vs. FC
• 2D vs. 3D
• Project presentations start in 2 weeks!
• Last 2 days of class, 2 hours/class
• 10 min talk (5 slides), demo, paper draft
• Final paper may 7
• CAVE tour now (torg 3050)