Tips &amp; Techniques 6 Random Numbers and Random Motion

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Tips & Techniques 6 Random Numbers and Random Motion - PowerPoint PPT Presentation

Tips &amp; 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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Tips & Techniques 6Random Numbersand 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
• In this session, we will look at examples of how to use random numbers in animations
Built-in functions
• Alice provides World-level built-in functions for generating random numbers.
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
• 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
• 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
• 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

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
• Read Tips & Techniques 6, Random Numbers and Random Motion