A list of basics topics working with C# in Unity
Player Movement
using UnityEngine;
using System.Collections;
public class PlayerController : MonoBehaviour {
public float speed;
private Rigidbody rb;
void Start ()
{
rb = GetComponent<Rigidbody>();
}
// FixedUpdate is called at a fixed interval and is independent of frame rate.
// Put physics code here.
void FixedUpdate ()
{
float moveHorizontal = Input.GetAxis ("Horizontal");
float moveVertical = Input.GetAxis ("Vertical");
Vector3 movement = new Vector3 (moveHorizontal, 0.0f, moveVertical);
rb.AddForce (movement * speed);
}
}Moving Camera
using UnityEngine;
using System.Collections;
public class CameraController : MonoBehaviour {
public GameObject player;
private Vector3 offset;
void Start ()
{
offset = transform.position - player.transform.position;
}
void LateUpdate ()
{
transform.position = player.transform.position + offset;
}
}Collectable Objects
using UnityEngine;
using System.Collections;
public class PlayerController : MonoBehaviour {
void OnTriggerEnter(Collider other)
{
if (other.gameObject.CompareTag ("Pick Up"))
{
other.gameObject.SetActive (false);
}
}
}Score Display
using UnityEngine;
using UnityEngine.UI;
using System.Collections;
public class PlayerController : MonoBehaviour {
public Text countText;
public Text winText;
private int count;
void Start ()
{
count = 0;
SetCountText();
winText.text = "";
}
void OnTriggerEnter(Collider other)
{
if (other.gameObject.CompareTag ( "Pick Up"))
{
count = count + 1;
SetCountText ();
}
}
void SetCountText ()
{
countText.text = "Count: " + count.ToString ();
if (count >= 12)
{
winText.text = "You Win!";
}
}
}Behaviour Components
using UnityEngine;
using System.Collections;
public class ExampleBehaviourScript : MonoBehaviour
{
void Update()
{
if (Input.GetKeyDown(KeyCode.R))
{
GetComponent<Renderer> ().material.color = Color.red;
}
}
}Check State
using UnityEngine;
using System.Collections;
public class CheckState : MonoBehaviour
{
public GameObject myObject;
void Start ()
{
Debug.Log("Active Self: " + myObject.activeSelf);
Debug.Log("Active in Hierarchy" + myObject.activeInHierarchy);
}
}Translate and Rotate
using UnityEngine;
using System.Collections;
public class TransformFunctions : MonoBehaviour
{
public float moveSpeed = 10f;
public float turnSpeed = 50f;
// Update is called once per frame
void Update ()
{
if(Input.GetKey(KeyCode.UpArrow))
transform.Translate(Vector3.forward * moveSpeed * Time.deltaTime);
if(Input.GetKey(KeyCode.DownArrow))
transform.Translate(-Vector3.forward * moveSpeed * Time.deltaTime);
if(Input.GetKey(KeyCode.LeftArrow))
transform.Rotate(Vector3.up, -turnSpeed * Time.deltaTime);
if(Input.GetKey(KeyCode.RightArrow))
transform.Rotate(Vector3.up, turnSpeed * Time.deltaTime);
}
}Look At
using UnityEngine;
using System.Collections;
public class CameraLookAt : MonoBehaviour
{
public Transform target;
void Update ()
{
transform.LookAt(target);
}
}Linear Interpolation
// In this case, result = 4
float result = Mathf.Lerp (3f, 5f, 0.5f);
// The Mathf.Lerp function takes 3 float parameters: one representing the value to interpolate from; another representing the value to interpolate to and a final float representing how far to interpolate
Vector3 from = new Vector3 (1f, 2f, 3f);
Vector3 to = new Vector3 (5f, 6f, 7f);
// Here result = (4, 5, 6)
Vector3 result = Vector3.Lerp (from, to, 0.75f);
// The same principle is applied when using Color.Lerp.
// In the Color struct, colours are represented by 4 floats representing red, blue, green and alpha.
// When using Lerp, these floats are interpolated just as with Mathf.Lerp and Vector3.Lerp.
void Update ()
{
light.intensity = Mathf.Lerp(light.intensity, 8f, 0.5f * Time.deltaTime);
// With deltaTime, the change to intensity would happen per second instead of per frame.
}GetAxis Horizontal and Vertical
using UnityEngine;
using System.Collections;
public class DualAxisExample : MonoBehaviour
{
public float range;
public GUIText textOutput;
void Update ()
{
float h = Input.GetAxis("Horizontal");
float v = Input.GetAxis("Vertical");
float xPos = h * range;
float yPos = v * range;
transform.position = new Vector3(xPos, yPos, 0);
textOutput.text = "Horizontal Value Returned: "+h.ToString("F2")+"\nVertical Value Returned: "+v.ToString("F2");
}
}OnMouseDown
using UnityEngine;
using System.Collections;
public class MouseClick : MonoBehaviour
{
void OnMouseDown ()
{
rigidbody.AddForce(-transform.forward * 500f);
rigidbody.useGravity = true;
}
}Using Other Components
using UnityEngine;
using System.Collections;
public class UsingOtherComponents : MonoBehaviour
{
public GameObject otherGameObject;
private AnotherScript anotherScript;
private YetAnotherScript yetAnotherScript;
private BoxCollider boxCol;
void Awake ()
{
anotherScript = GetComponent<AnotherScript>();
yetAnotherScript = otherGameObject.GetComponent<YetAnotherScript>();
boxCol = otherGameObject.GetComponent<BoxCollider>();
}
void Start ()
{
boxCol.size = new Vector3(3,3,3);
Debug.Log("The player's score is " + anotherScript.playerScore);
Debug.Log("The player has died " + yetAnotherScript.numberOfPlayerDeaths + " times");
}
}Using Delta Times
using UnityEngine;
using System.Collections;
public class UsingDeltaTime : MonoBehaviour
{
public float speed = 8f;
public float countdown = 3.0f;
void Update ()
{
countdown -= Time.deltaTime;
if(countdown <= 0.0f)
light.enabled = true;
if(Input.GetKey(KeyCode.RightArrow))
transform.position += new Vector3(speed * Time.deltaTime, 0.0f, 0.0f);
}
}Using Data Types
using UnityEngine;
using System.Collections;
public class DatatypeScript : MonoBehaviour
{
void Start ()
{
//Value type variable
Vector3 pos = transform.position;
pos = new Vector3(0, 2, 0);
//Reference type variable
Transform tran = transform;
tran.position = new Vector3(0, 2, 0);
}
}Using Instantiate
using UnityEngine;
using System.Collections;
public class UsingInstantiate : MonoBehaviour
{
public Rigidbody rocketPrefab;
public Transform barrelEnd;
void Update ()
{
if(Input.GetButtonDown("Fire1"))
{
Rigidbody rocketInstance = Instantiate(rocketPrefab, barrelEnd.position, barrelEnd.rotation) as Rigidbody;
rocketInstance.AddForce(barrelEnd.forward * 5000);
}
}
}Arrays
using UnityEngine;
using System.Collections;
public class Arrays : MonoBehaviour
{
public GameObject[] players;
void Start ()
{
players = GameObject.FindGameObjectsWithTag("Player");
for(int i = 0; i < players.Length; i++)
{
Debug.Log("Player Number "+i+" is named "+players[i].name);
}
}
}Invoke
using UnityEngine;
using System.Collections;
public class InvokeScript : MonoBehaviour
{
public GameObject target;
void Start()
{
Invoke (nameof(SpawnObject), 2);
// Repeating
InvokeRepeating(nameof(SpawnObject), 2, 1);
// TODO: Use UniRx/Observables instead :)
}
void SpawnObject()
{
float x = Random.Range(-2.0f, 2.0f);
float z = Random.Range(-2.0f, 2.0f);
Instantiate(target, new Vector3(x, 2, z), Quaternion.identity);
}
}Enumerations
using UnityEngine;
using System.Collections;
public class EnumScript : MonoBehaviour
{
enum Direction {North, East, South, West};
void Start ()
{
Direction myDirection;
myDirection = Direction.North;
}
Direction ReverseDirection (Direction dir)
{
if(dir == Direction.North)
dir = Direction.South;
else if(dir == Direction.South)
dir = Direction.North;
else if(dir == Direction.East)
dir = Direction.West;
else if(dir == Direction.West)
dir = Direction.East;
return dir;
}
}