Module 2: Bounds and Navigation

Required Skills

You need to master and practice the following skills in Unity:

• Working with Unity Prefabs
  • Create prefabs in editor
  • Create/Delete objects at runtime
• Continue working with GameObject Transform component
  • Set positions
  • Set object rotation/orientation
• User Interface
  • Getting world position from mouse
• Object collisions and responses

Core Concepts

You need to understand and master these concepts:

• Camera and visible world bounds
• Frame update time vs wall-clock real time
• Randomness and simple applications in games
• Direct object control: driving objects

Camera Bounds

Runtime Behavior

Use WASD to place arrows, randomly respawn when touching camera bounds.

Project Organization

• Create new Scripts folder in Assets
• Create two subfolders under Scripts:
  • Hero (supports GreenUp)
  • Utilities (contains CameraSupport)

Scene Setup

• MainCamera: Add CameraSupport component
• GreenUp: Add GreenArrowBehavior component

CameraSupport Script

public class CameraSupport : MonoBehaviour 
{
    private Camera mTheCamera;
    private Bounds mWorldBound;

    // Get current world bounds
    public Bounds GetWorldBound() 
    {
        return mWorldBound;
    }

    // Check collision with world bounds
    public bool CollideWorldBound(Bounds objectBound) 
    {
        return mWorldBound.Intersects(objectBound);
    }
}

Object Navigation

Runtime Behavior

Green arrow follows mouse, or toggle to WASD control with spacebar.

Key Features

• Public variables visible in Inspector and changeable during runtime
• Speed: Distance per unit time
  • mHeroSpeed: units moved per second
  • mHeroRotateSpeed