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Question by chrisall76 · Jan 12, 2013 at 05:46 AM · c#raycastfps

Ray.direction editing not working in C#?

Hello,

So today I decided to transfer my FPS code from UnityScript to C#, and I only have one more problem. this piece of code:

     void  ShootReg (){
         Transform trf = transform; // a little optimization
         RaycastHit hit;
         Quaternion hitRotation = Quaternion.FromToRotation(Vector3.up, hit.normal);
         Transform cam = Camera.main.transform;
         Ray ray = new Ray(cam.position, cam.forward);
 
     
         ray.direction.x += Random.Range(-CurrentSpreadF, CurrentSpreadF);
         ray.direction.y += Random.Range(-CurrentSpreadF, CurrentSpreadF);
         ray.direction.z += Random.Range(-CurrentSpreadF, CurrentSpreadF);
  
         if(Physics.Raycast (ray, out hit, Distance)){

causes this error: "Cannot modify a value type return of 'UnityEngine.Ray.Direction'. Consider storing the value in a temporary variable."

Any help?

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Answer by robertbu · Jan 12, 2013 at 06:01 AM

Something like this has always solved the issue for me:

 Vector3 v3T = ray.direction;
 v3T.y += Random.Range(-CurrentSpreadF, CurrentSpreadF);
 v3T.y += Random.Range(-CurrentSpreadF, CurrentSpreadF);
 v3T.z += Random.Range(-CurrentSpreadF, CurrentSpreadF);
 ray.direction = v3T;
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