XNA Creators Club Online - beginner's guide 3d: chapter 9


	beginner's guide

3D Lessons

	1	Introducing the 3D Tutorial
	2	Creating the Game Project
	3	Adding Assets
	4	Drawing Terrain
	5	Drawing a Game Object
	6	Making a Missile Launcher
	7	Firing Missiles
	8	Making Sounds
	9	Creating Enemies
	10	Destroying Enemies

9. Creating Enemies

Use the random number generator and linear interpolation math to create regenerating enemy UFOs that fly across the screen.

Step 1

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Instantiate a random number generator, and create and fill an enemy GameObject array to represent the enemy UFOs.

Step 2

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Start an UpdateEnemies method that will move the enemy GameObjects across the screen by their velocity each frame.

Step 3

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Create constants to constrain your random number generator, then modify the UpdateEnemies method to randomly place your enemies using random numbers and linear interpolation.

Step 4

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Draw the enemy UFOs on screen using the DrawGameObject method.

Download source code