OverlapCollider - colliding with object even when not touching it

Questions & Answers
, ,
1

Hey all,
I am creating an OverlapCollider to find out, if something is colliding with it. I am also drawing it.

But even though, that in the scene the collider doesn’t seem to touch the object ( its about 3 cm above it), a collision seems to be happening. The collision with cube 1.7 is correct, the collision with cube 2 should not happen from my point of view. I have checked the collider of the cube 2, and it’s fine.

image
image598×1246 84.1 KB

Both, the Collider and the drawWireCube are placed at the same center with the same dimensions, so I don’t understand how this could happen.

Any ideas, what is going wrong here? Either the drawCube is not drawn where the Collider really is or I don’t know… I’m afraid it’s something stupid, but I just can’t figure it out…

My code:

…

data.ledgePoint = new Vector3(hit.point.x, hit.point.y + 0.03f, hit.point.z) ;
if (data.isCrouching)
{
      data.dimensions = new Vector3(0.84f, 1.6f, 0.84f);
      data.center = new Vector3(data.ledgePoint.x + (data.dimensions.x / 2), data.ledgePoint.y + 0.8f, data.ledgePoint.z);
}
else
{
      data.dimensions = new Vector3(0.6f, 2.1f, 0.6f);
      data.center = new Vector3(data.ledgePoint.x + (data.dimensions.x / 2), data.ledgePoint.y + 1.05f, data.ledgePoint.z);
}

Collider[] spaceCollider = Physics.OverlapBox(data.center, data.dimensions, Quaternion.identity, ~data.playerLayer);

int i = 0;
while (spaceCollider.Length != 0 && i < spaceCollider.Length)
{
     Debug.Log("Hit: " + spaceCollider[i].name);
     i++;
}

…

void OnDrawGizmos()
{
     Gizmos.color = Color.red;
     Gizmos.DrawWireCube(data.center, data.dimensions);
}

Thank you Huxi.

2

As a small test, can you see if raising that “+ 0.03f” value stops this? Is there any value that does stop it? That may help figure out what’s causing this issue.

3

After testing, it turns out the second parameter you pass to the Physics.OverlapBox is called “halfExtents”, which means you actually need to divide the vector3 value you pass in by 2 in order to match the gizmo box’s position AND dimensions.
Let me know if this fixes the issue, and feel free to mark this as resolved if so!