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Design Realization lecture 3

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Design Realization. lecture 3. John Canny. 9/2/03. Reminder. Class home page is ... Reminder. Critical summaries of last weeks readings due today. ... – PowerPoint PPT presentation

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Title: 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.)

4
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.

5
Curve editing
  • The edit curves menu provides more operations
  • Close an open curve.
  • Join two curves.
  • Cut a curve.

6
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.

7
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.

8
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.

9
Concepts
  • Scene Graph
  • Transformations
  • History

10
Reminder
  • Critical summaries of last weeks readings due
    today.
  • Maya CD will be available Thursday.
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