entry-4.md

Entry 4: MVP

Recap

In the previous entry, I talked about the codes I learned and used to make the characters (player and NPCs) move. In this entry, I will talk about the changes I made to the movements for the player and added controls using the mouse.

Trial Code

Trying to rotate the camera and the player using the mouse

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class CameraMouseMove : MonoBehaviour
{
    Vector2 mouseLook; //faces the mouse 
    Vector2 smoothV; //smooth the movement of mouse
    public float sensitivity = 3; //sensitivity of mouse
    public float smoothing = 2.0f; //speed of the smoothing speed

    public GameObject player; //get player
 
    void Update()
    {

        var md = new Vector2(Input.GetAxisRaw("Mouse X")*4.0f, Input.GetAxisRaw("Mouse Y")); //control the camera using mouse

        //turning the mouse with certain speed
        md = Vector2.Scale(md, new Vector2(sensitivity * smoothing, sensitivity * smoothing));
        smoothV.x = Mathf.Lerp(smoothV.x, md.x, 1f / smoothing);
        smoothV.y = Mathf.Lerp(smoothV.y, md.y, 1f / smoothing);
        mouseLook += smoothV;

        //moving the player and camera
        transform.localRotation = Quaternion.AngleAxis(-mouseLook.y, Vector3.right);
        transform.localRotation = Quaternion.AngleAxis(mouseLook.x, Vector3.up);
        player.transform.localRotation = Quaternion.AngleAxis(mouseLook.x, player.transform.up);

    }
}

Camera follows the player

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class CameraView : MonoBehaviour
{
    public GameObject player; //get player

    private Vector3 offset; //set distance from player

    void Start()
    {
        offset = transform.position - player.transform.position; //distance
    }

    void LateUpdate()
    {
        transform.position = player.transform.position + offset;  //stay at a certain distance from the player
    }
}

Useful Syntax

Cursor.lockState and CursorLockMode

These are used to lock and unlock the cursor in the center of the screen/game

Cursor.visible

Shows/hides the cursor

AddForce and ForceMode.Impulse

These are used to add force to the direction of the vector and rigid body

Input.GetAxis

This will return the virtual axis of my mouse

Quaternion.AngleAxis

Rotates a certain degree around the axis

Player Movements

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

[RequireComponent(typeof(Rigidbody))] //allow the use of physics
public class CharacterControl : MonoBehaviour
{
    public int ShowCursor = 0; //set showing cursor to false
    public float speed = 1;
    public Vector3 jump;
    public float jumpForce = 2.0f; //height of jump
    public bool isGrounded; //check if player is on the ground
    private Rigidbody rb; //use physics
    void Start()
    {
        Cursor.lockState = CursorLockMode.Locked; // start without showing cursor and lock the cursor in the center of the screen
        rb = GetComponent<Rigidbody>(); //use physics
        jump = new Vector3(0.0f, 2.0f, 0.0f); //how high to jump
    }

    void OnCollisionStay()
    {
        isGrounded = true; //when touching the ground, the player is on the ground
    }

    void Update()
    {
        //move the player
        float moveInY = Input.GetAxis("Vertical") * 5;
        float moveInX = Input.GetAxis("Horizontal") * 5;
        moveInY *= Time.deltaTime;
        moveInX *= Time.deltaTime;

        transform.Translate(moveInX, 0, moveInY);

        //make player jump by pressing space
        if (Input.GetKeyDown(KeyCode.Space) && isGrounded)
        {
            rb.AddForce(jump * jumpForce, ForceMode.Impulse);
            isGrounded = false;
        }

        //make the cursor disappear and appear. However, when making the cursor disappear again, have to click on the mouse to make it disappear
        if (Input.GetKeyDown(KeyCode.Escape))
        {
            if (ShowCursor == 0)
            {
                Cursor.visible = true;
                Cursor.lockState = CursorLockMode.None;
                ShowCursor++;
            }
            else
            {
                Cursor.visible = false;
                Cursor.lockState = CursorLockMode.Locked;
                ShowCursor = 0;
            }
        }
    }
}

Camera Movements

using UnityEngine;
using System.Collections;

public class TransformFollower : MonoBehaviour
{

    public float turnSpeed = 4.0f;
    public Transform player; //allow to move the player

    //distance from the player
    public float height = 1f;
    public float distance = -4f;

    private Vector3 offsetX;
    private Vector3 offsetY;

    void Start()
    {
        //set distance
        offsetX = new Vector3(0, height, distance);
        offsetY = new Vector3(0, 0, distance);
    }

    void LateUpdate()
    {
        player.Rotate(0, Input.GetAxis("Mouse X") * turnSpeed, 0); //rotating the player with mouse

        //rotating around the player using the mouse
        offsetX = Quaternion.AngleAxis(Input.GetAxis("Mouse X") * turnSpeed, Vector3.up) * offsetX;
        offsetY = Quaternion.AngleAxis(Input.GetAxis("Mouse Y") * turnSpeed, Vector3.right) * offsetY;
        transform.position = player.position + offsetX;
        transform.LookAt(player.position);
    }
}

Takeaways

• Don't just copy tutorials and/or codes other people provide online. There are many solutions for your problem(s) on the internet. You may be tempted to copy the solutions, but that won't help you learn. You can use it as a reference and learn from it. Also, the solution may not be exactly how you want your project to work. It's better to know how to solve instead of copy.

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