/// <summary>
/// Grow the octree to fit in all objects.
/// </summary>
/// <param name="direction">Direction to grow.</param>
void Grow(Vector3 direction)
{
int xDirection = direction.x >= 0 ? 1 : -1;
int yDirection = direction.y >= 0 ? 1 : -1;
int zDirection = direction.z >= 0 ? 1 : -1;
BoundsOctreeNode <T> oldRoot = rootNode;
float half = rootNode.BaseLength / 2;
float newLength = rootNode.BaseLength * 2;
Vector3 newCenter = rootNode.Center + new Vector3(xDirection * half, yDirection * half, zDirection * half);
GameObject go = GameObject.Find("Node " + rootNode.GetHashCode().ToString());
// Create a new, bigger octree root node
rootNode = new BoundsOctreeNode <T>(newLength, minSize, looseness, newCenter);
if (go != null)
{
go.transform.position = newCenter;
go.transform.localScale = Vector3.one * newLength;
go.name = "Node " + rootNode.GetHashCode();
Debug.Log("Node: Change scale #" + rootNode.GetHashCode().ToString());
}
else
{
GameObject newGameObject = GameObject.Instantiate(GameObject.Find("TempNode"), newCenter, Quaternion.identity);
newGameObject.transform.localScale = Vector3.one * newLength;
newGameObject.name = "Node " + rootNode.GetHashCode();
Debug.Log("Node: New game object #" + rootNode.GetHashCode());
}
if (oldRoot.HasAnyObjects())
{
// Create 7 new octree children to go with the old root as children of the new root
int rootPos = GetRootPosIndex(xDirection, yDirection, zDirection);
BoundsOctreeNode <T>[] children = new BoundsOctreeNode <T> [8];
for (int i = 0; i < 8; i++)
{
if (i == rootPos)
{
children[i] = oldRoot;
}
else
{
xDirection = i % 2 == 0 ? -1 : 1;
yDirection = i > 3 ? -1 : 1;
zDirection = (i < 2 || (i > 3 && i < 6)) ? -1 : 1;
children[i] = new BoundsOctreeNode <T>(rootNode.BaseLength, minSize, looseness, newCenter + new Vector3(xDirection * half, yDirection * half, zDirection * half));
}
}
// Attach the new children to the new root node
rootNode.SetChildren(children);
}
}
/// <summary>
/// Constructor for the bounds octree.
/// </summary>
/// <param name="initialWorldSize">Size of the sides of the initial node, in metres. The octree will never shrink smaller than this.</param>
/// <param name="initialWorldPos">Position of the centre of the initial node.</param>
/// <param name="minNodeSize">Nodes will stop splitting if the new nodes would be smaller than this (metres).</param>
/// <param name="loosenessVal">Clamped between 1 and 2. Values > 1 let nodes overlap.</param>
public BoundsOctree(float initialWorldSize, Vector3 initialWorldPos, float minNodeSize, float loosenessVal)
{
if (minNodeSize > initialWorldSize)
{
Debug.LogWarning("Minimum node size must be at least as big as the initial world size. Was: " + minNodeSize + " Adjusted to: " + initialWorldSize);
minNodeSize = initialWorldSize;
}
Count = 0;
initialSize = initialWorldSize;
minSize = minNodeSize;
looseness = Mathf.Clamp(loosenessVal, 1.0f, 2.0f);
rootNode = new BoundsOctreeNode <T>(initialSize, minSize, loosenessVal, initialWorldPos);
GameObject newGameObject = GameObject.Instantiate(GameObject.Find("TempNode"), initialWorldPos, Quaternion.identity);
newGameObject.transform.localScale = Vector3.one * initialSize;
newGameObject.name = "Node " + rootNode.GetHashCode();
Debug.Log("Node: New game object #" + rootNode.GetHashCode());
}
