1. Design Realization lecture 3 John Canny 9/2/03

2. Reminder  Class home page is www.cs.berkeley.edu/~jfc/DR/F03 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. kettle.cs.berkeley.edu/DesignRealization2  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.