Ball

Script

Follow this step-by-step guide to create the given script:

Step 1: Create a new script

• In your Unity project, right-click in the 'Assets/RollABall/Common/Scripts' panel and select 'Create' > 'C# Script'. Name the script 'Ball'.

Step 2: Open the script in an editor

• Double-click the 'Ball' script in the 'Assets' panel to open it in your preferred code editor.

Step 3: Add namespaces

• At the top of the script, replace the existing 'using' statements with the following:

  using NetPad;
  using NetPad.Attributes;
  using RollABall.Common;
  using UnityEngine;
  using Random = UnityEngine.Random;

Step 4: Define the class and namespace and inherit from NetPadBehaviour

• Replace the 'MonoBehaviour' inheritance with 'NetPadBehaviour' in the class definition:

  namespace RollABall.Game
  {
      public class Ball : NetPadBehaviour
      {
      }
  }

Step 5: Add serialized fields and GetComponent attributes

• Within the 'Ball' class, add the following serialized fields and GetComponent attributes:

  [SerializeField, GetComponent] private Rigidbody Rigidbody;
  [SerializeField] private float Speed = 5f;
  [SerializeField, GetComponent(inChildren: true)] private MeshRenderer MeshRenderer;

Step 6: Override the OnInstantiate method

• Inside the 'Ball' class, override the OnInstantiate method and add the following code to set the random color for the player and the MeshRenderer:

• 'OnInstantiate' is called on NetPadBehaviour's when properly instantiated

• Properties, is a key value cache an can be used to sync values between game and controller

public override void OnInstantiate()
{
    var rndColor = Random.ColorHSV();
    NetPadPlayer.Properties.SetPlayerColor(rndColor);
    MeshRenderer.material.color = rndColor;
}

Step 7: Create the FixedUpdate method

• Add a private FixedUpdate method to handle the movement of the ball:

  private void FixedUpdate()
  {
      Move();
  }

Step 8: Create the Move method

• Implement the Move method to read the acceleration input from NetPadInput and apply force to the Rigidbody:

  private void Move()
  {
      var direction = NetPadInput.GetAcceleration();
      if (direction == Vector2.zero)
      {
          return;
      }
  
      Rigidbody.AddForce(new Vector3(direction.x, 0, direction.y) * Speed, ForceMode.Acceleration);
  }

Step 9: Save and return to Unity

• Save the 'Ball' script in your code editor and return to the Unity editor. The script will automatically compile and be ready for use.

Prefab

• Create a Sphere inside a scene

• Add the Rigidbody component

• Drag and drop the Ball script on to it.

• Rename the Sphere GameObject to 'Ball'.

• Drag and drop the the Ball GameObject into the Folder 'Assets/RollABall/Game/Prefabs