Picking shapes
Using the mouse for a pick
- Create a behavior that wakes up on mouse events
- On a mouse release:
- Construct a PickRay from the eye passing
through the 2D mouse screen point
- Initiate a pick to find all pick hits along the ray,
sorted from closest to furthest
- Get the first pick hit in the returned data
- Do something to that picked shape
- (Re)declare interest in mouse events
