PLAYER SCRIPT

SCRIPT NEEDS TO ACCOMPLISH...

• Create a variable to hold the sphere prefab

• Method for what happens when we left click

• Raycast w/ origin of Mouse Position

• HitInfo to detect the floor

• Instantiate sphere at hit point

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

public class ClickToInstantiate : MonoBehaviour
{
    [SerializeField]
    private GameObject _spherePrefab;


    void Update()
    {
        if (Mouse.current.leftButton.wasPressedThisFrame)
        {
            Vector2 mousePos = Mouse.current.position.ReadValue();
            Ray rayOrigin = Camera.main.ScreenPointToRay(mousePos);
            RaycastHit hitInfo;


            if (Physics.Raycast(rayOrigin, out hitInfo))
            {
                Debug.Log("Hit: " + hitInfo.collider.name);
                Instantiate(_spherePrefab, hitInfo.point, Quaternion.identity);
            }
        }
    }
}

CODE BREAKDOWN

• LINE 14 - 26 ==> If statement that is ran when the user presses the left mouse button

  • LINE 16 --> Creates a Vector2 type variable to hold the position of the mouse

  • LINE 17 --> Defines the starting point of the ray [rayOrigin]

  • LINE 18 --> Structure used to get information back from a raycast collision [RaycastHit]

• LINE 21 - 25 ==> If statement that returns true when the ray intersects into any collider [Raycast Declaration]

  • LINE 23 --> Access the extracted information in hitInfo to display the Objects name in the Unity Console

  • LINE 24 --> instantiates the sphere prefab at the point of intersection of the raycast and the floor

    • hitInfo.point --> the impact point in the world space where the ray hit the collider

    • quaternion --> Quaternions are vectors used to compute rotations in software.

    • quaternion.identity --> The quaternion identity is the default or none value to the objects rotation. By setting the rotation of a new object to this value, it ensures that the new object will be in its "natural" orientation.