What's the step by step process of creating a game in Unity 3D?

You will get lots and lots of Tutorials on unity3d .

, Home , http://Unity3d.com .

But if you will learn the basic functions , Your Precious Time in unity3d Scripting will be saved a lot like :-

1). Movements like Horizontal , Vertical , Up and Down .

1. Vector3 movement = new Vector3 (moveHorizontal, 0.0f, moveVertical); 
2. rigidbody.velocity = movement * speed; 

2). RigidBody Collision .

1. void OnCollisionEnter(Collision collision)  
2. { 
3. // Debug-draw all contact points and normals foreach (ContactPoint contact in collision.contacts)  
4. { 
5. Debug.DrawRay(contact.point, contact.normal, Color.white);  
6. } 

3). Gravity .

1. Physics.gravity = new Vector3(0, -1.0F, 0); 

4). Friction .

rigidbody2D.AddForce(new Vector2(inputX * xSpeed, 0));

5). Bouncing .

Add Component -> Physics -> Rigidbody

Add Component -> Physics -> Sphere collider

Assets -> Create -> Physics material

Set Bounciness to 0.8

6). Score Increment .

1. void OnGUI () {
2. GUIButtonCountTo (0);
3. GUIButtonCountTo (5000);
4. GUIButtonCountTo (20000);
5. GUILayout.Label ("Current score is " + score);
6. }

7). Pause and Restart the Game .

1. if (!isPaused) { if (GUI.Button(Rect(10,10,50,50), "Pause")) { Time.timeScale = 0f; isPaused = true; } } 

8). Destroyed on Collision .

1. void OnCollisionEnter (Collision col) { if(http://col.gameObject.name == "prop_powerCube") { Destroy(col.gameObject); } } 

9). Sound ON and OFF .

1. if(soundToggle)
2. {
3. audioSource.SetActive(true);
4. //audioSource.mute = true;
5. //audioSource.volume = 1.0f;
6. }
7. else
8. {
9. audioSource.SetActive(false);
10. //audioSource.mute = false;
11. //audioSource.volume = 0.0f;
12. }

10). Force .

1. void FixedUpdate() { rb.AddForce(transform.forward * thrust); } 

11). Increase Speed .

1. curSpeed += acceleration;
2. if (curSpeed > maxSpeed)
3. curSpeed = maxSpeed;