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Question by kbones · Nov 21, 2013 at 07:04 PM · rotationraycasthitraycasts

RayCast not moving with Game Object

So, I'm dealing with a very odd thing. I am by no means proficient with RayCasts but I was suggested to use this as a means to create gravity along odd surfaces (raycast down to get the normal). Of course, when I do this, I get odd results.alt text

For whatever reason, my raycast doesn't move along with the sphere properly. This causes the sphere to rotate along the surface incorrectly. I figure it's got to be something with the ray.direction of the script but for the life of me I just don't know. Any help would be appreciated.

 enter code hereusing UnityEngine;
 using System.Collections;
 
 public class DownCast : MonoBehaviour {
     
 
     
     // Use this for initialization
     void Start () {
     
     }
     
     // Update is called once per frame
     void Update () {
     
         Ray ray = new Ray(); 
         ray.origin = transform.position;
         ray.direction = Vector3.down;
         RaycastHit hit;
         
         if (Physics.Raycast(ray, out hit, 100))    
             Debug.DrawLine(ray.origin, hit.point);
         
 
         Vector3 transformedNormal = hit.collider.transform.TransformDirection(hit.normal);
         Debug.DrawLine(hit.point, -transformedNormal,Color.red);
         
         rigidbody.AddForce(-transformedNormal * 1);
         
         transform.rotation = Quaternion.FromToRotation (Vector3.up, transformedNormal);
         
         
 
         
     }
 }
 




Basically what I want to do is just have it raycast out of the bottom of the player (the green sphere in this case) and have it rotate along with the sphere so I can always have an Up to use for the rigidbody.AddForce function. I plan to use this for other objects instead of just spheres.

raycast staying in place.png (38.8 kB)
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