don slater [email protected] wanda dann [email protected] motion and rotation copyright...
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Wanda [email protected]
Motion and Rotation
Copyright 2012 Wanda Dann, Don SlaterAll rights reserved
3 Dimensional Space
An Alice objecto 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 SlaterAll rights reserved
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 SlaterAll rights reserved
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 SlaterAll rights reserved
Orientation Orientation is an object’s
o sense of its own forward and up direction
Copyright 2012 Wanda Dann, Don SlaterAll rights reserved
Up
Forward
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 SlaterAll rights reserved
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 SlaterAll rights reserved