Get Vector3 From Another Script

Question

I'm trying to make the player character turn, based on the way that it moves in another GameObject (The movement is controlled by a parent object and the turning is controlled by a child object). Right now my code looks like:

 using UnityEngine;
 using System.Collections;
 
 public class turn : MonoBehaviour {
 
 public float turnSpeed = 6.0F;
 
 
 private int moving = 0;    
 public Transform camera;
 public GameObject player;
 private Vector3 cameraDirection = Vector3.zero;
 private float movex;
 private float movey;
 private Vector3 turning;
 public Vector3 


     void FixedUpdate () {
         if (Input.GetAxis("Horizontal")==0F && Input.GetAxis("Vertical")==0F)
              moving = 0;
         else
              moving = 1;
         if (moving == 0)
             cameraDirection = camera.transform.forward;
         
     float turn = turnSpeed * Time.deltaTime;
     var script = player.GetComponent("Movement");
     Vector3 turnDirection = script.GetComponent("moveDirection") as Vector3;
     turning = Vector3.RotateTowards(transform.forward, turnDirection, turn, 0.0F);
     transform.rotation = Quaternion.LookRotation(turning);
     
     }
      
     }

and it gives me the error: "The 'as' operator cannot be used with a non-nullable value type 'UnityEngine.Vector3'". How can I fix this or get the Vector3 another way?

Answer 1

Answer by Landern · Jan 20, 2017 at 02:17 PM

As is a wonder type cast in that if it can no resolve then you can check for null, this means it can not be a value type(a struct, like a Vector3 is) unless you use Nullable, but that is a waste in this case. The problem you may have is if it can't find it it will throw with a general type cast, but you can change line 29 to:

 Vector3 turnDirection = (Vector3)script.GetComponent("moveDirection");

You may want to also use the generic version rather then that string version of GetComponent.

 Vector3 turnDirection = (Vector3)script.GetComponent<moveDirection>();

I also doubt that moveDirection is a Vector3 type and is really a script/class you have already written with a field or property with the Vector3 on it, if that is the case.

 moveDirection md = (Vector3)script.GetComponent<moveDirection>();
 Vector3 moveDirection = md.whateverContainsTheValueYouWantToGrab;

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Get Vector3 From Another Script

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