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Design Realization lecture 3

Design Realization lecture 3. John Canny 9/2/03. Reminder. Class home page is www.cs.berkeley.edu/~jfc/DR/F03 Class swiki (password needed) is up at kettle.cs.berkeley.edu/DesignRealization2 please submit summaries there by tonight.

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Design Realization lecture 3

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  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/DesignRealization2please 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 tangent:uses 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. • It’s 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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