Random Animal Stampeed
1. Create a spawn manager
- In the Hierarchy, create an Empty object called “SpawnManager”
- Create a new script called “SpawnManager”, attach it to the Spawn Manager, and open it
- Declare new public GameObject[ ] animalPrefabs;
- In the Inspector, change the Array size to match your animal count, then assign your animals by dragging them from the Project window into the empty slots Note: Make sure you drag them from the Project window; not the Hierarchy! If you're going to spawn objects, you need to make sure you're using Prefabs, which are stored in the Project window.
2. Spawn an animal if S is pressed
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In Update(), write an if-then statement to instantiate a new animal prefab at the top of the screen if S is pressed
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Declare a new public int animalIndex and incorporate it in the Instantiate call, then test editing the value in the Inspector
3. Spawn random animals from array
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In the if-statement checking if S is pressed, generate a random int animalIndex between 0 and the length of the array
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Remove the global animalIndex variable, since it is only needed locally in the if-statement
4. Randomize the spawn location
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Replace the X value for the Vector3 with Random.Range(-20, 20), then test
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Within the if-statement, make a new local Vector3 spawnPos variable
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At the top of the class, create private float variables for spawnRangeX and spawnPosZ
5.Change the perspective of the camera
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Toggle between Perspective and Isometric view in Scene view to appreciate the difference
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Select the camera and change the Projection from “Perspective” to “Orthographic”
6. Lesson Recap
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The player can press the S to spawn an animal
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Animal selection and spawn location are randomized
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Camera projection (perspective/orthographic) selected
New Concepts & Skills
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Spawn Manager
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Arrays
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Keycodes
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Random generation
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Local vs Global variables
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Prespective vs Isometric projections
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Next Lesson
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Using collisions to feed our animals!