Object Manipulation Observations

1
Object Manipulation Observations

• 1. Most objects attached or connected to other
  objects
• 2. Objects easier to position if in contact with
  others
• 3. Objects do not interpenetrate
• 4. Occlusion most important to judge 3D position
• 5. Use entire area of visual overlap of the
  moving object with static scene.
• 6. Only visible objects can be manipulated
• 7. "Handles" and wireframe/orthognal view confuse
• 8. 3D or 6D input devices less precise than 2D

2
New 3D Movement Technique

• Traditional technique (using mouse cursor
  position)
• New technique (using moving object area)
• Modification (using foremost plane behind moving
  object)

3
SESAME - Sketch, Extrude, Sculpt And Manipulate
Easily

• Objects slide on visible surfaces dont collide
• View dependent manipulation
• Suggestions for precision
• Grouping technique for composite object manip.
• 3-button mouse normal monitor