1. Init: project setup

• Manual: Unity's interface

New project

• Open Unity Hub.
• If Unity editor is not detected: in the "Installs" tab, click on "Locate", navigate to C:\Program Files\Unity 2021.3.18f1\Editor, and select "Unity.exe".
• In Unity Hub, click on "New project".
• Choose the correct Unity version, select "3D", set project name, and click on "Create project".
• The Unity editor should open in a few minutes.

Scene initial setup

• By default, the scene contains the Main Camera and Directional Light.
• Add GameObjects: Capsule and Plane (right-click in the Hierarchy window -> 3D Object).
  • The Capsule will serve as the player, and the Plane will serve as the floor (rename it to "Floor").

Player initial setup

• Add an empty GameObject, rename it to "Player", and set the Capsule as its child.
• Set the Capsule's position to 0, 0, 0 (relative to its parent, Player), and reposition "Player" back to the center of the plane (above it).
• Gravity and Collision:
  • Select the Player GameObject and in the Inspector window, click on "Add Component".
    • Search for the "Rigidbody" component (not the 2D version) and add it.
    • Both the Player and the floor need colliders to prevent the player from passing through the floor. They should already have them (Capsule has a collider by default, as does the Plane).
  • Click on the play button to start the game.
    • The player should fall to the floor and collide with it.
  • To prevent the capsule from falling over upon collision, select the Player GameObject, go to the Inspector, expand Constraints, and select Freeze Rotation for the X, Y, and Z axes.

Player initial controller (movement)

• In the Project window, right-click on the Assets folder and create a new folder named "Scripts".
• In the Scripts folder, create a new C# script named "PlayerController".
• Drag and drop the script into the Inspector window for the Player (adding the Player Controller component to that GameObject).
• Double click on the script to open it in the editor. Paste the following code:

using UnityEngine;

public class PlayerController : MonoBehaviour
{
    // Speed at which the player moves
    public float moveSpeed = 5f;

    // Update is called once per frame
    void Update()
    {
        // Get input from the player
        float horizontalInput = Input.GetAxisRaw("Horizontal");
        float verticalInput = Input.GetAxisRaw("Vertical");

        // Calculate the movement direction based on input
        Vector3 moveDirection = new Vector3(horizontalInput, 0f, verticalInput).normalized;

        // Move the player based on the input direction
        transform.Translate(moveDirection * moveSpeed * Time.deltaTime);
    }
}

• Save the script and wait for Unity to reload it.
• The moveSpeed variable will be visible in the inspector as a property (in the Player Controller component in Player GameObject) because it is set as public.
• You should now be able to move the player using the WASD and/or arrow keys.

Build the project

• To build the project:
  • Click on File > Build Settings > Add Open Scenes > Build.
  • Execute the exe to run the game.
  • Alt-f4 to exit the game.

Backup the project

• To find the project location click on the three dots next to the project in Unity Hub and click on "Show in Explorer."
• The entire project is a few hundred megabytes, but most of the memory is taken up by the Library folder.
  • To reduce the project size you can delete the Library folder (Unity will rebuild that folder once the project is opened again).

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