RayCast to all directions

Question

Hi,

i am having issue with raycasting. I would need object to do a raycast to all directions from its position and then check the rayhit vector so i could invert the vector for the object so it moves away from the rayhit. is this somehow possible ? Something like checksphere, but getting also the data from the hit, mostly the vector between the object and the rayhit.

I did some solution with raycast into 5 directions combined with checksphere, but its too heavy i guess, its almost 500 lines and i dont think its clean solution, when i am sure there is better way.

Thanks for any advise.

Answer 1

Answer by Henrique Vilela · May 04, 2011 at 01:37 AM

You can use Physics.OverlapSphere to get all the objects that are on the desired radius, than Transform.TransformPoint on the enemy position to get the direction vector.

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Answer 2

look here for a raycasting version of a collider, not sure if it's exactly what your looking for, but it wouldn't be to hard to modify it to have hit raycast hit vars. Good luke, Luke!!! :)

Also, the code is listed below:

#pragma strict

var layerMask : LayerMask; //make sure we aren't in this layer 
var skinWidth : float = 0.1; //probably doesn't need to be changed 
private var minimumExtent : float; 
private var partialExtent : float; 
private var sqrMinimumExtent : float; 
private var previousPosition : Vector3; 
private var myRigidbody : Rigidbody; 
//initialize values 
function Awake() { 
   myRigidbody = rigidbody; 
   previousPosition = myRigidbody.position; 
   minimumExtent = Mathf.Min(Mathf.Min(collider.bounds.extents.x, collider.bounds.extents.y), collider.bounds.extents.z); 
   partialExtent = minimumExtent*(1.0 - skinWidth); 
   sqrMinimumExtent = minimumExtent*minimumExtent; 
}

function FixedUpdate() { 
   //have we moved more than our minimum extent? 
   var movementThisStep : Vector3 = myRigidbody.position - previousPosition; 
   var movementSqrMagnitude : float = movementThisStep.sqrMagnitude;
   if (movementSqrMagnitude > sqrMinimumExtent) { 
      var movementMagnitude : float = Mathf.Sqrt(movementSqrMagnitude);
      var hitInfo : RaycastHit; 
      //check for obstructions we might have missed 
      if (Physics.Raycast(previousPosition, movementThisStep, hitInfo, movementMagnitude, layerMask.value)) 
         myRigidbody.position = hitInfo.point - (movementThisStep/movementMagnitude)*partialExtent; 
   } 
   previousPosition = myRigidbody.position; 
}

Answer 3

Answer by zmar0519 · May 04, 2011 at 12:43 AM

You could use Vector3.distance to calculate if something came close, not sure how to tell which direction it's coming from, though.

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Answer 4

Answer by Richard J. Hansen · May 04, 2011 at 03:25 AM

Could you you just use a collision sphere and then just the direction to/away from the contact point?

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RayCast to all directions

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