tips techniques 6 random numbers and random motion
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Tips & Techniques 6 Random Numbers and Random Motion. Alice. Random Numbers. Random numbers are used in certain kinds of computer programs Examples: security for web applications encryption for satellite transmissions gaming programs scientific simulations

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Presentation Transcript
random numbers
Random Numbers
  • Random numbers are used in certain kinds of computer programs
  • Examples:
    • security for web applications
    • encryption for satellite transmissions
    • gaming programs
    • scientific simulations
  • In this session, we will look at examples of how to use random numbers in animations
built in functions
Built-in functions
  • Alice provides World-level built-in functions for generating random numbers.
slide4
Demo
  • Ch06Lec3PenguinRandomMoves
  • Concepts illustrated in this example
    • The random number function returns a floating point value between 0 and 1.
    • A different range of values can be obtained by using the minimumand maximum parameters.
    • The integer only option allows selection of either floating point or whole numbers.
random 3d motion
Random 3D Motion
  • In the previous example, the penguin moves in only one direction.
  • In some animations, we want an object to move to a random location in 3D. We call this random 3D motion.
  • For example, the goldfish in this world is to swim in a random motion, where the fish can move in any direction .
six possible directions
Six possible directions
  • Of course, six move directions are possible
    • forward, backward, left, right, up, down
  • In this example, we can eliminate backward because goldfish do not swim backward.
  • To simplify the code, we can take advantage of negative numbers.
    • For example, this instruction actually moves the goldfish right:
storyboard
Storyboard
  • Only three move instructions are needed:
    • up (will move down if the random number is negative)
    • left (will move right if random number is negative)
    • forward (no backward motion)
  • Two parameters (min, max) will be used to restrict the motion of the fish to a nearby location-- to look like swimming.

randomMotion

Parameters:min, max

Do together

fish moves up a random number distance

fish moves left a random number distance

fish moves forward a random number distance

slide8
Demo
  • Ch06Lec3GoldfishRandom3DMotion
  • Concepts illustrated in this example
    • A random movement in 3D space is accomplished by three simultaneous move instructions.
    • In this example, the minimum distance of the move forward instruction is 0 (the goldfish always moves forward).
    • To call the randomMotion method, min and max values are sent as arguments to the parameters
assignment
Assignment
  • Read Tips & Techniques 6, Random Numbers and Random Motion
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