1. Don Slater dslater@andrew.cmu.edu Wanda Dann wpdann@andrew.cmu.edu Motion and Rotation Copyright 2012 Wanda Dann, Don Slater All rights reserved

2. 3 Dimensional Space  An Alice object o Is located in a 3D world, positioned at (x, y, z) o has 3 dimensions o height, width, depth o can move in 6 directions up right forward down left back Copyright 2012 Wanda Dann, Don Slater All rights reserved

3.  An object’s center is its pivot point (around which it moves and rotates).  The center of an object is usually where it stands on the ground Center center Copyright 2012 Wanda Dann, Don Slater All rights reserved

4. Location  An object’s location is where the center point of an object is located, relative to the ground’s origin (x,y,z) (19, 15, -20) (0, 0, 0) Center of the world (origin) Copyright 2012 Wanda Dann, Don Slater All rights reserved

5. Orientation  Orientation is an object’s o sense of its own forward and up direction Copyright 2012 Wanda Dann, Don Slater All rights reserved Up Forward

6.  Translational motion changes the location of an object in the world  The direction of translational motion is stated relative to the orientation of the object. ◦ Six possible directions  move  left  right  up  down  forward  backward forward right up back Copyright 2012 Wanda Dann, Don Slater All rights reserved

7.  Rotational motion changes the orientation of an object in the world  There is no change of location of the object  An object’s center acts as its pivot point for rotation.  Two forms of rotational motion:  turn  forward, backward  left, right  roll  left, right Copyright 2012 Wanda Dann, Don Slater All rights reserved