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Learn about rotational motion of objects, dimensions, orientation, and translational motion in a 3D world with interactive demos and a focus on center-based movement. Explore aeronautical terminology and assignment resources for further study.
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CSC1401:Introductory Programming Rotational Motion
Motion • Motion of an object is relative to • the orientation (front) of the object • the center of the object
Center of an object • An object is positioned in the world around its center. • The center of an object can be: • At the center of mass, or • Where it stands on the ground, or • Where it is held or connected (a hinge joint)
Dimensions and Orientation • A 3D object has • 3 dimensions • height, width, depth • orientation
Motion • Motion of an object is relative to • its orientation • its center
Translational Motion • Change of position of the entire object in the world • The direction of translational motion is stated relative to the orientation of the object. • Objects are ego-centric, motion based on orientation of the object • Six possible directions • move • left • right • up • down • forward • backward
Demo: Mouse Control Toolkit • To reposition objects in the world, use the buttons in the mouse control toolkit
Demo: Translational Motion • Six possible directions • move • left • right • up • down • forward • backward
Demo: Pull-down menu methods • In setting up a world, can be used to • resize an object • precisely position an object and it's subparts
Rotational Motion • Rotational motion occurs around the center (pivot point) of the object or subpart of the object. • Directions are divided among two instructions: • turn • forward, backward • left, right • roll • left, right • No up and downdirections!
Demo • Rotational Motion • Note that the movement is around the center of the object. • turn • forward orientation changes • roll • forward orientation remains the same
Aeronautical Terminology • Pitch: turn forward or backward – rotation is like a hinged lid on a box • Yaw: turn left and right – rotation is like a door on hinges • Roll (a.k.a. Bank); roll left or right – rotation is like a doorknob
Assignment • Read (before the next class session) • Chapter 1-2, Alice Concepts • Tips & Techniques 1, Special Effects
Lab 1 • Due next class session