How can you make it that the FPS can pickup a object and move it around like in most source games

I have read some tutorials of how to add a pickup to the characters hand, but for that you must have a character so that the pickup would be attached to the hand. You need to create a new script with this code.

using System; using System.Collections;

public class Pickup : MonoBehaviour { public Vector3 Offset = new Vector3(0f, 0f,0f); // Move the pickup slightly to match the hand public Vector3 ScalingFactorWhenHeld = new Vector3(0.4f, 0.4f, 0.4f); // Allows to scale the object smaller so that the player can hold it in its hand.

 private Vector3 InitialPosition; // Scales the pickup position when player dies.
 private Quaternion InitialRotation;
 private bool inRange = false;
 bool isHeld = false; // Tells if the object is being held.
 private Animation ItemAnim; // It is useful if the object has an animation

 private SphereCollider sphereCollider;

 void Awake() 
 {
     itemAnim = transform.Findchaild("PICKUPNAME").animation;
     sphereCollider = GetComponent("PICKUPNAME") as SphereCollider;
     initialPosition = transform.position; // Records initial position of the pickup
     initialRotation = transform.rotation;

 }

 void OntriggerEnter() // It is used when the pickup has volume
 {
     inRange = true;
 }

 void OntriggerExit()
 {
     inRange = false;
 }

 void LateUpdate() // You need another script called TP_Controller to make the statement isholding
 {
     if (inRange && !TP_Controller.Instance.isHolding && Input.GetKeyDown(KeyCode.E))
     {
         itemAnim.Stop;
         TP_Controller.Instance.IsHolding = true;
         TP_Controller.Instance.ObjectHeld = this;
         isHeld = true;
         TP_Contorller.Instance.Use();
     }

     if (isHeld) // if pickup is on the hand set the sphere collider to 0, TargetHand is the bone of the hand
     {
         sphereCollider.radius = 0;
         transform.localScale = ScalingFactorWhenHeld;
         transform.position = TP_Controller.Instance.TargetHand.position + Offset;
         transform.rotation = Quaternion.Euler(TP_Controller.Instance.TragetHand.rotation.eualerAngles.x,
             TP_Controller.Instance.TargetHand.rotation.eulerAngels.y + 90, 
             TP_Controller.Instance.TragetHand.rotation.eualerAngles.z)
     }
 }


 public void Reset()
 {
     isHeld = false;
         transform.position = initialPosition;
     transform.rotation = initialRotation;
     transform.localScale = new Vector3(1, 1, 1);
     sphereCollider.radius = 1; // Is used to reset the pickup to 1 agan, because when it is hels the collider is set to 0 to avoid collisions.
     itemAnim.Play();
 }

}

I found this script in a series of tutorials calles Unity 3rd person setup from 3d buzz it explains everything you need to know to create a character, and you can tweak it so you can play wih it and change it to a FPS, I highly recommend it, it was very useful to me and I dont speak english. But for the script I gave you you need to first create Another script called TP_Controller wich holds a character state called isHeld, that means that the character holds something in its hand. And therefore you go, you can ask me any question.