CSC1401: Introductory Programming

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CSC1401Introductory Programming

• Rotational Motion

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Motion

• Motion of an object is relative to
• the orientation (front) of the object
• the center of the object

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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)

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Dimensions and Orientation

• A 3D object has
• 3 dimensions
• height, width, depth
• orientation

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Motion

• Motion of an object is relative to
• its orientation
• its center

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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

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Demo Mouse Control Toolkit

• To reposition objects in the world, use the
  buttons in the mouse control toolkit

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Demo Translational Motion

• Six possible directions
• move
• left
• right
• up
• down
• forward
• backward

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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

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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 down directions!

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Demo

• Rotational Motion
• Note that the movement is around the center of
  the object.
• turn
• forward orientation changes
• roll
• forward orientation remains the same

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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

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Assignment

• Read (before the next class session)
• Chapter 1-2, Alice Concepts
• Tips Techniques 1, Special Effects

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Lab 1

• Due next class session