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Tips & Techniques 6 Random Numbers and Random MotionPowerPoint Presentation

Tips & Techniques 6 Random Numbers and Random Motion

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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

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