Is there a way to use Physics.Raycast accurately while time.timescale is set to zero?

Question

For a test I attached the following script to a cube at origin on a scene:

 using UnityEngine;
 
 public class Test : MonoBehaviour
 {
     void Start()
     {
         Time.timeScale = 0;
     }
 
     void Update()
     {
         gameObject.transform.position = new Vector3(0, -1, 0);
 
         if (Physics.Raycast(Camera.main.ScreenPointToRay(Input.mousePosition)))
         {
             print("Hit!");
         } else
         {
             print("No Hit!");
         }
     }
 }

While hovering over the location that the cube was before the update of the scene, the raycast is true. While hovering over the location where the cube actually appears the raycast is false. I don't know if this behavior is to be expected (Maybe the physics doesn't update the collider positions while time is stopped?) However, what have is a drag and drop kind of system of containers with 3D item representations that follow along with it in a menu. I want to be able to gather raycastHit information on the item clicked. Any help is appreciated.

Answer 1

Answer by myzzie · May 06 at 07:35 AM

The raycast is accurate, and it does work with timescale 0. The problem here is that you're moving the object in update.

     void Start()
     {
         Time.timeScale = 0;
         gameObject.transform.position = new Vector3(0, -1, 0);
     }
 
     void Update()
     {
         if (Physics.Raycast(Camera.main.ScreenPointToRay(Input.mousePosition)))
         {
             print("Hit!");
         }
         else
         {
             print("No Hit!");
         }
     }

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AlexDonaldArcher · May 06 at 05:25 PM 0

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I will want to move the object in update because the object will be moving during runtime not just initialization. Suppose instead of just setting the position once the cube is moving in a circular pattern, This solution wouldn't work. I think it only works in start because start occurs before the physics update.Source

Is there a way to use Physics.Raycast accurately while time.timescale is set to zero?

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