2nd lecture for Binary Studio Academy PRO course about Unity 3D by Max Goncharuk (.NET developer at Binary Studio) binary-studio.com

1. Unity 3D
Scripting
binary-studio.com

2. Contents
1. Intro
2. Creating and using
3. Controlling GameObjects
4. Attributes
5. Event functions
6. Coroutines
7. Execution order

3. Intro
1. Respond to input
2. Arrange for events in the gameplay
3. Create graphical effects
4. Control physical behaviour of objects
5. Create custom AI

4. Creating and using
Assets -> Create -> C#/JS Script
- Start() instead of constructor
- public variables

5. Creating and using
Object
Component
Behaviour
(enabled)
MonoBehaviour
(coroutines)
Script

6. Controlling game objects
Api
GameObject (Static) - Find, FindWithTag (FindGameObjectWithTag), Instantiate / CreatePrimitive, Destroy
Component(instance) - GetComponent(s), GetComponentInChildren, GetComponentInParent
Transform - new RectTransform(), new Transform()
Vector - new Vector2(), new Vector3(), new Vector4()

7. Controlling game objects
var cube = GameObject.Find("Cube");
light = cube.GetComponent<Light>();
light.enabled = false;

8. Attributes
C#: [HideInInspector]
JS: @HideInInspector
- Header
- Range
- RequireComponent
- SerializeField
- Tooltip

9. Event functions
1. Awake()
2. Start()
3. FixedUpdate() - fixed deltaTime, used for physics update
4. OnTriggerXXX() - Enter, Stay, Exit
5. OnCollisionXXX() - Enter, Stay, Exit
6. Update() - once per frame, used for any update
7. LatestUpdate() - once per frame
8. Reset() - first attached or Reset command

10. Coroutines
- Fire and Forget
a) Working independently
b) return null
- WaitForSeconds, WaitForFixedUpdate
a) Wait for completion through chaining
b) Synchronize activities

11. Coroutines
Api:
- StartCoroutine
- StopCoroutine
- StopAllCoroutines
- WaitForEndOfFrame
- WaitForFixedUpdate
- WaitForSeconds
- WaitUntil

12. Coroutines
Fire and Forget
void Update() {
if (Input.GetKeyDown("f")) {
StartCoroutine("Fade");
}
}
IEnumerator Fade() {
for (float f = 1f; f >= 0; f -= 0.1f) {
Color c = renderer.material.color;
c.a = f;
renderer.material.color = c;
yield return null;
}
}
Wait for completion
IEnumerator Start() {
print("Starting " + Time.time); =
yield return StartCoroutine("WaitAndPrint");
print("Done " + Time.time);
}
IEnumerator WaitAndPrint() {
yield return new WaitForSeconds(5);
print("WaitAndPrint " + Time.time);
}

13. Demo

14. Execution order
Events order

15. Useful links
1. Manual
2. API
3. Answers

16. Home Task
1. Create cube with light.
2. Every frame change color of cube.
3. Every three seconds turn toggle light.
4. Every 5 second up light intensity to max value and during 5 second fade it.
5. Right of the screen display current color, state of light, and intensity.