How to use correctly a SphereCastAll

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I'm trying to create a tactical-turn-based-tile-game. I need to be able to check all the available points to where my character can move in a radius of 2 for exemple. I was thinking about using SphereCastAll to get all points around the unit doing the following:

RaycastHit[]FoundWaypoints = Physics.SphereCastAll(Character.transform.position, 2.0f, Vector3.forward);

But this doesn't quite do what I expect it to do so I think I'm getting all wrong how SphereCast is used. What I except that is happening is a sphere that gets build around Character position in a radius of 2, but that's not really what is happening. Does anyone have an idea what I could do to make this work?

Sorry if it isn't so clear I'm not that good in english. Tell me if something isn't clear.

Answer 1

Best Answer

Answer by Deign · May 10, 2014 at 05:51 PM

Spherecast is used the same as Raycast, the only difference is the diameter of the raycast. What I think you're actually trying to do is OverlapSphere

https://docs.unity3d.com/Documentation/ScriptReference/Physics.OverlapSphere.html

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Akorna · May 10, 2014 at 06:00 PM 0

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This was exactly what I needed cheers. Just going to try and figure out now how I could cut the corners.... that's gonna be a bit harder ... ^^

sudhir_kotila · Oct 30, 2015 at 11:43 AM -1

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Thank you so much. Physics.OverlapSphere is very much useful for me to detect multiple object within specific radius. Thanks a lot.

Answer 2

Answer by ttRevan · Oct 30, 2015 at 08:51 PM

IMHO you don't need Physics at all. Simple tiling cordiates can solve your problem:

 ------ ----- ----- -----
 | 1.1 | 1.2 | 1.3 | 1.4 |
  ----- ----- ----- -----
 | 2.1 | 2.2 | x   | 2.4 |
  ----- ----- ----- -----
 | 3.1 | 3.2 | 3.3 | 3.4 |
  ----- ----- ----- -----

You can then find matching tiles:

 var xNum = Mathf.Ceil(range / tileSizeX);
 var yNum = Mathf.Ceil(range / tileSizeY);
 
 List<Tile> availPoints = new List<Tile>();
 for (var i = 1; i <= xNum; i++) {
     availPoints.Add(allTiles.Get(playerTile.x + i, playerTile.y));
     availPoints.Add(allTiles.Get(playerTile.x - i, playerTile.y));
 }
 for (var i = 1; i <= yNum; i++) {
     availPoints.Add(allTiles.Get(playerTile.x, playerTile.y + i));
     availPoints.Add(allTiles.Get(playerTile.x, playerTile.y - i));
 }

In case you have hex tiles, algorithm will be somewhat different, but idea is the same.

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How to use correctly a SphereCastAll

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