Design Realization lecture 5

1
Design Realization lecture 5

• John Canny
• 9/9/03

2
Preamble

• Reactions to Maya?
• Please return the CDs soon (new material needs to
  be installed on them).
• Blog for Maya help is under construction.

3
Last Time

• Alignment join elements without merging.
• Scene graph and hierarchy.
• Constraints using expressions.
• Shape control blendshapes (finish today).

4
Next Time

• Well have an in class critique of your
  designs-in-progress.
• Please make a first pass at a chair model in Maya
  by Thursday.
• Bring a laptop with your model or send it to a
  partner who has a laptop, so you can show your
  model in class.

5
Shape control

• Maya has a tool for controlling parametric shape
  called Blendshapes.
• (Animation) Deform ? Blend Shapes
• Trick by default Blendshapes ignores the
  transform hierarchy.
• it only responds to control point deformation.
• Changing that default makes it behave obviously.

6
Materials and texture

• Maya includes rich material models (aka shaders)
  for common materials.
• Some will be on the next CD update.
• A material includes attributes like
• Type Phong, Blinn models of reflection
  (shine).
• Color obvious usually a texture.
• Transparency can be fixed or a texture.
• Bump map adjustment of surface normals.
• Displacement map adjustment of surface depth.

7
Texture coordinates

• A texture can be any 2D image.
• Can be grabbed from clipart, from photographs or
  scanners, or can be a synthetic image.
• 2D images have X, Y coordinates. NURB surfaces
  have U, V coordinates which are used to map the
  texture.
• Isoparm curves on surfaces show the U, V
  directions.
• Checkerboard or brick textures are a good way to
  learn mapping techniques.

8
From shape to movement

• Motion is one of the most expressive forms
  available to a designer.
• Animation literally means to give life.

9
Qualities of movement

• List some

10
Qualities of movement

• Hint What are good movements?

11
Keyframing

• Keyframing is the traditional digital method for
  animation.
• The scene is posed at all significant transitions
  and sample poses. Then the animation code
  interpolates between them.
• Motion curves (trajectories) can be edited much
  like NURB curves.

12
Movement composition

• In character animation, movements are not atomic.
  They break down as
• Anticipation
• Action
• Reaction
• Example Jumping block.

13
Morphing and moving

• A general shape deformer like Blendshapes can be
  used to pose a complex model.
• Its relatively easy to use Blendshapes plus
  keyframing to animate a face.
• Create a new copy of the face and set it to each
  facial expression, then blend with Blendshape to
  create an expression control.

14
Todo

• Work on your chair designs for Thursday.
• Find a partner if needed for in-class demo.
• Please return the CDs soon.