Unity 3D Game Engine – Set Material Transparency
1. MAIN TOP MENU> Gameobject> Create Other> Cube
2. Hierarchy, select the Cube> Inspector> materal slot, select Shader: Transparent/Diffuse
NOTICE; YOu HAVE TO USE a Transparent shader, in Unity3D only Transparent Shaders support alpha channel
3. Select the Cube and assign SetTransparency.JS:
#pragma strict
function Start () {
}
function Update () {
gameObject.renderer.material.color.a = 0.5; // set transparency to 50%
}
Unity 3D Game Engine – Fade Out Transparency
1. MAIN TOP MENU> Gameobject> Create Other> Cube
2. Hierarchy, select the Cube> Inspector> materal slot, select Shader: Transparent/Diffuse
NOTICE; YOu HAVE TO USE a Transparent shader, in Unity3D only Transparent Shaders support alpha channel
3. Select the Cube and assign FadeOutTransparency.JS:
#pragma strict
// Fades from minimum to maximum in seconds
var minimum = 1.0;
var maximum = 0.0;
var fadeoutSpeed = 1f; // 0.1 slow, 2 fast
function Start () {
}
function Update () {
gameObject.renderer.material.color.a = Mathf.Lerp (minimum, maximum, fadeoutSpeed * Time.time);
}
Unity 3D Game Engine – Materials – Fade Between 2 Base Colors
1. MAIN TOP MENU> Gameobject> Create Other> Cube
2. Hierarchy, select the Cube> Inspector> materal slot, select Shader: Diffuse
NOTICE: the script will fade between ‘Shader> ‘Main Color’ values, you HAVE TO REMOVE all textures if you want to see ‘Main Color’!
3. Add to the Cube Fade.JS
#pragma strict
// Fade the color from red to green
// back and forth over the defined duration
var colorStart : Color = Color.red;
var colorEnd : Color = Color.green;
var duration : float = 1.0;
function Start () {
}
function Update () {
var lerp : float = Mathf.PingPong (Time.time, duration) / duration;
renderer.material.color = Color.Lerp (colorStart, colorEnd, lerp);
}
4. Done!
Unity 3D Game Engine – Load Next Level
Syntax:
// Load the level named "level2".
Application.LoadLevel ("level2");
// Load the level index 1,
// you find this value inside Buil Settings> 'Scenes in Build'
Application.LoadLevel (1);
To improve performance a big game is broken over many levels.
Inside Unity3D you can use Scenes to create levels.
1. MAIN TOP MENU> File> New Scene, create 2 scenes: level1 and level2
2. Project window> DOUBLE CLICK over level1 to select the scene
3. MAIN TOP MENU> GameObject> Create Empty ‘GameController’> Inspector> ‘Add Component’> GameController.JS
#pragma strict
var scores : int;
function Start () {
scores = 10;
}
// On Click Counter START #########################
//This is the variable we are using to store the number of clicks
var clickCounter: int;
//This creates a button and adds +1 to clickCounter variable every 1 click
function OnGUI () {
if (GUI.Button (Rect (10,10,150,100), "You clicked:" + clickCounter)) {
clickCounter ++;
}
}
// On Click Counter END ###########################
function Update () {
if (clickCounter > 10) {
scores = 20;
// Load the level named "level2".
Application.LoadLevel ("level2");
}
} // END Update
4. MAIN TOP MENU> File> Buil Settings> DRAG AND DROP level1 and level2 scenes over ‘Scenes in Build’ window
Add the scenes into Build or Application.LoadLevel (“level2”); will not work!
When you click 11 times over the GUI.Button, level2 will be loaded.
JS Basics – Passing variables between functions attached to different GameObjects
Hierarchy:
– Cube -> attach CubeScript.js
– GameController (Empty GameObject), Inspector> Tag rollout ‘GameController’ -> attach GameController.JS
CubeScript.js
#pragma strict
// definisco la variabile per il punteggio
var scoreValue : int;
// variabile privata, non visibile in Inspector, mi serve per ottenere il componente GameController
private var gameController : GameController;
function Start ()
{
// inserisco in una variabile l'oggetto con tag GameController
var gameControllerObject : GameObject = GameObject.FindWithTag ("GameController");
// se l'oggetto con tag GameController esiste lo inserisco in una variabile
if (gameControllerObject != null)
{
gameController = gameControllerObject.GetComponent (GameController);
}
// se l'oggetto con tag GameController non esiste restituisce un messaggio di errore
if (gameController == null)
{
Debug.Log ("Cannot find 'GameController' script");
}
}
function Update () {
SendData();
}
function SendData() {
yield WaitForSeconds (3); // aspetta 3 secondi
scoreValue = 10;
// invia scoreValue allo script taggato GameController -> funzione AddScore()
gameController.AddScore (scoreValue);
Destroy(gameObject); // distruggi l'oggetto corrente altrimenti l'invio di dati si ripete ad ogni frame
}
GameController.JS
#pragma strict
// contatore di punteggio, private perchè non vogliamo che sia modificabile da Inspector
private var score : int;
function Start () {
}
function Update () {
}
function AddScore (newScoreValue : int) {
// aggiorna score aggiungendo il valore newScoreValue
// che gli viene inviato da CubeScript.js
// alla riga: - gameController.AddScore (scoreValue); -
score += newScoreValue;
Debug.Log(score);
}
The final console result is: 10
Spiegazione:
1. CubeScript.js
a. cerca un GameObject con il tag GameController
b. se presente ottiene dall’oggetto GameController il componente GameController (che non è altro che GameController.JS)
c. invia a GameController.JS -> funzione ‘AddScore()’ la variabile ‘scoreValue’;
2. GameController.JS
a. riceve nella funzione ‘AddScore()’ la variabile ‘scoreValue’
b. assegna ‘scoreValue’ alla variabile ‘newScoreValue’
c. effettua i calcoli e visualizza in console il risultato finale.
