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

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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### Tips & Techniques 6Random Numbersand Random Motion

Alice

• 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

• Alice provides World-level built-in functions for generating random numbers.

• 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.

• 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 .

• 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:

• 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

• 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

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