1. Animator Help Session
May 21st, :30
May 22nd, :30

2. Agenda Introduction Curve implementation - What are all those vectors?
- Where should I put things?
Particle System
- What is it?
- What should I implement?
Animation
- What should I do?

3. Introduction How to integrate with my model?
Modeler View vs. Curves View
Graph Widget Interface

4. Curve Implementation What are all those vectors?
In any specific curveEvaluator class
ptvCtrlPts: a collection of control points that you specify in the curve editor
ptvEvaluatedCurvePts: a collection of evaluated curve points that you return from the function calculated using the curve type’s formulas
fAniLength: maximum time that a curve is defined
bWrap: a flag indicating whether or not the curve should be wrapped

5. Curve Implementation Where should I put things?
Create
- Bezier
- B-spline
- Catmull-Rom
In GraphWidget class
- Change the skeleton to call your new constructors in the GraphWidget class.

6. Curve Implementation Some more stuff
Wrapping Curve
This can be tricky sometimes, but here’s the basic idea.
You would like to have a full set of control points available for you to do calculations on.
If you are wrapping then you’ll need to reuse one or two points from the beginning of your curve.
How can we do this? Easy…make ghost points that are after your actual time window but have the same value as the first one or two points.
Now you can generate your curve the same way you normally would.

7. Particle System What is it?
Particle Objects
Forces
An engine for simulating the effect of the forces

8. Particle System What should I implement?
Constructor
Destructor
Simulation functions
- drawParticles()
- startSimulation()
- computeForcesAndUpdateParticles()
- stopSimulation()
Particle and force class… maybe?

9. Particle System Some more stuff
World coordinate of particles??
- Model View Matrix
- Inverse Camera Transformation
- Generate global coordinate for (0,0) in the model view coordinates.
Euler Method
Hooking up your particle System

10. Any Questions? jschoell@cs.washington.edu yeuhi@cs.washington.edu