Let's look at the class we created in this chapter and break it down into easily digestible parts.

Firstly, here is what a basic Unity C# class looks like, broken down to its bare essentials:

using UnityEngine; 

namespace HoloLensBeginnersGuide 
{ 
    public class LaunchBall : MonoBehaviour 
    {    //member variables and properties belong here. 

        void Start() 
        { 

        } 
        void Update() 
        { 
        } 
     }   
} 

Now, we will want to compare that to LauchBall.cs. A Unity C# class consists of the following:

• Using declarations: The using directive is primarily used for including namespaces in the application. Defaults in Unity are UnityEngine and System.Collections:

        using UnityEngine; 
        using System.Collections; 

• Namespace: Namespace definitions are designed to prove a way to keep names separate from one another; this helps simplify reusing code later:

        namespace HoloLensBeginnersGuide 
        { 

• Class declaration: The name of this LaunchBall class, which will normally derive from MonoBehaviour in Unity:

        public class LaunchBall : MonoBehaviour { 

• Member variables: These are the variables or data storage for the class; we will talk about this subject very soon:

               // Member Variables 

            public Vector3 launchBallHome =  
                            new Vector3(0.0f, 0.0f, 4.0f); 
            public float lbSpeed; 
            public bool checkLBToggle = true; 
            private Color lbColor;     
            Renderer rend; 
            bool lbJump; 

• Class methods: The actions this class can perform:

        //Class Methods 
            void TeleportBall() 
            { 
                if (transform.position.y >= 2) 
                { 
                    transform.position =  
                     new Vector3(transform.position.x, -1, 
                         transform.position.z); 
                } 
                 
            } 
            void ChangeColor() 
            { 
                float redColor = 0.1f; 

                lbColor.r = redColor; 
                lbColor.g = Random.Range(0, 1f); 
                lbColor.b = Random.Range(0, 1f); 
            } 
            void LaunchBallJump() 
            { 
                transform.Translate(Vector3.up *  
                                       lbSpeed * Time.deltaTime);         
            } 


            void CheckLB() 
            { 
                int i = Random.Range(0, 1000); 
                if(i < 997) 
                { 
                    lbJump = true; 

                } 
                else 
                { 
                     
                    lbJump = false; 
                    transform.position = launchBallHome; 
                } 

            } 

Here are our MonoBehaviour-specific methods Start() and Update() at work:

        void Start() 
            { 
                gameObject.transform.position = launchBallHome; 
                lbSpeed = 0.1f;         
                lbColor = new Color(0.1f, 0.2f, 0.5f); 
                rend = gameObject.GetComponent<Renderer>(); 
                lbJump = true;   
        } 


        void Update ()  
        { 
                if (lbJump) 
        { 
                    TeleportBall(); 
                    ChangeColor(); 
                    rend.material.color = lbColor; 
                    LaunchBallJump(); 
                } 

                if (checkLBToggle) 
                { 
                    CheckLB(); 
                } 
               } 

• Statements and expressions: This is where a good deal of the work happens. All statements and expressions must end with a semicolon:

        gameObject.transform.position = launchBallHome; 
        transform.Translate(Vector3.up * lbSpeed * Time.deltaTime);