GravityGun

using UnityEngine;

public class GravityGun : MonoBehaviour
{
    [SerializeField] Camera cam;
    [SerializeField] Transform objectHolder;
    [SerializeField] float maxGrabDistance = 10f;
    [SerializeField] float holdForce = 500f;
    [SerializeField] float damping = 10f;
    [SerializeField] float throwForce = 20f;

    [SerializeField] Collider playerCollider;
    Collider grabbedCollider;

    Rigidbody grabbedRb;

    void Awake()
    {
        // playerCollider = GetComponentInChildren<Collider>();
    }

    void FixedUpdate()
    {
        if (grabbedRb)
        {
            Vector3 toTarget = objectHolder.position - grabbedRb.position;
            float distance = toTarget.magnitude;

            // Apply velocity to follow the holder
            Vector3 velocity = toTarget * holdForce * Time.fixedDeltaTime;
            grabbedRb.linearVelocity = velocity;

            // Optional damping
            grabbedRb.linearVelocity = Vector3.Lerp(grabbedRb.linearVelocity, Vector3.zero, Time.fixedDeltaTime * damping);
        }
    }

    void Update()
    {
        if (Input.GetKeyDown(KeyCode.F))
        {
            if (grabbedRb) Drop();
            else TryGrab();
        }

        if (grabbedRb && Input.GetMouseButtonDown(0))
        {
            Throw();
        }
    }

    void TryGrab()
    {
        Ray ray = cam.ViewportPointToRay(new Vector3(0.5f, 0.5f));
        if (Physics.Raycast(ray, out RaycastHit hit, maxGrabDistance))
        {
            Rigidbody rb = hit.rigidbody;
            if (rb)
            {
                grabbedRb = rb;
                grabbedRb.useGravity = false;
                grabbedRb.linearDamping = 10f;

                grabbedCollider = grabbedRb.GetComponent<Collider>();
                // if (playerCollider && grabbedCollider)
                // {
                //     Physics.IgnoreCollision(playerCollider, grabbedCollider, true);
                // }
            }
        }
    }

    void Drop()
    {
        if (!grabbedRb) return;
        grabbedRb.useGravity = true;
        grabbedRb.linearDamping = 0f;
        grabbedRb = null;

        if (playerCollider && grabbedCollider)
        {
            Physics.IgnoreCollision(playerCollider, grabbedCollider, false);
        }
    }

    void Throw()
    {
        if (!grabbedRb) return;

        grabbedRb.useGravity = true;
        grabbedRb.linearDamping = 0f;
        grabbedRb.AddForce(cam.transform.forward * throwForce, ForceMode.VelocityChange);
        grabbedRb = null;

        if (playerCollider && grabbedCollider)
        {
            Physics.IgnoreCollision(playerCollider, grabbedCollider, false);
        }
    }
}