Design Realization lecture 3

1
Design Realization lecture 3

• John Canny
• 9/2/03

2
Reminder

• Class home page iswww.cs.berkeley.edu/jfc/DR/F03
  
• Class swiki (password needed) is up
  atkettle.cs.berkeley.edu/DesignRealization2
  please submit summaries there by tonight.
• Maya CD still coming (no mail since Friday).
  Assignment going out Thursday.

3
Last Time

• Some qualities of 3D shapes.
• Creating shapes from curves. Tangents, knots and
  control points. Curve continuity.
• Creating surfaces from curves rotating, lofting,
  skinning, extruding (contd.)

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Curve creation

• Curves are created in 3 main ways in Maya
• Pencil tool (from pen or mouse input).
• EP curve, specifying end and via points.
• CV curve tool, from create menu.
• Curve editing can be done by
• Editing the control points (a CV curve).
• Editing a curve point position and tangentuses
  the curve editing tool.

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Curve editing

• The edit curves menu provides more operations
• Close an open curve.
• Join two curves.
• Cut a curve.

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Duplication

• There are two ways to duplicate
• Copying makes a new copy of the object that is
  separately editable.
• Instancing uses the same geometry with a
  transform.
• Instancing is very useful for making global
  changes to a model.
• Its the basis of the rotate tool, and can be
  used in lofting.

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3D shape creation

• 3D shapes can be created by
• Rotating a curve.
• Lofting several curves.
• Planar skins joining curves in the same plane.
• Extrusion.
• several other more specialized methods.

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3D shape editing

• Manipulating control points (and sets of them).
• Manipulating Faces.
• Using deformers (later). A deformer allows
  deformation of many control vertices at once
• Twists, bends, flares, etc.
• Wraps deformation near a surface.
• Wires deformation near a curve.

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Concepts

• Scene Graph
• Transformations
• History

10
Reminder

• Critical summaries of last weeks readings due
  today.
• Maya CD will be available Thursday.