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Design Realization lecture 8

This lecture covers the topics of kinematics, constraints, and dynamics in Maya, with a focus on joint creation, binding skin, inverse kinematics, and handle creation.

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Design Realization lecture 8

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  1. Design Realization lecture 8 John Canny 9/18/03

  2. Preamble • Handouts include the Maya bible chapters on skeletons and IK. • First assignment models are due on the swiki today. • New Dell PCs arrived so there will be more machines running Maya unlimited.

  3. Last Time • Kinematics – skeletons and joint hierarchies. • Local coordinate systems. • Inverse kinematics.

  4. This time – kinematics & constraints • Lets start with the joint-creating tool: • (Animation) →Skeleton → Joint tool • Use default settings • Draw each joint (front view usually). • Adjust “joint” transforms so all moving axes are Z axes. • Recall that X displacement should give link length.

  5. Binding skin • Actually very easy. • Select the skin to be bound, and the top link of the joint hierarchy to bind it to. • Then select Skin → Bind skin And choose either rigid or smooth bind.

  6. IK and constraints • IK allows us to position a given joint. • To control other attributes, we use constraints. • E.g. we can create a handle which is used as a constraint for both position and orientation.

  7. Handles • The goal is to use IK, constraints and attributes to create full control “handle” for the object. • example

  8. Dynamics • Dynamics deals with physical properties of objects: • Mass, moments. • Stiffness and damping (restitution). • Friction (static and dynamic). • Movement is governed by: • Newton’s laws (free movement). • Coulomb’s laws (friction). • Restitution models (many).

  9. Dynamics • Dynamics deals with physical properties of objects: • Mass, moments. • Stiffness and damping (restitution). • Friction (static and dynamic). • Movement is governed by: • Newton’s laws (free movement). • Coulomb’s laws (friction). • Restitution models (many).

  10. Dynamics • Note: free bodies don’t simply spin. Newton’s laws imply a more complicated motion… • Rolling and sliding objects have strange behavior: movies. • Impulse = Fdt

  11. Wrapup • Chair designs due on Swiki today. • Who still needs the 2nd round of CD data? • Make sure you have a copy of assignment 2.

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