/// <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>
/// Grow the octree to fit in all objects.
/// </summary>
/// <param name="direction">Direction to grow.</param>
// 扩展八叉树的范围，原来的范围*2
// 会创建7个新的节点，同旧的根节点，一个8个节点
// 作为新的根节点的孩子
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;
// 新的根节点大小，是原来的2倍
float newLength = rootNode.BaseLength * 2;
// 新的根节点的中心坐标
Vector3 newCenter = rootNode.Center + new Vector3(xDirection * half, yDirection * half, zDirection * half);
// Create a new, bigger octree root node
rootNode = new BoundsOctreeNode <T>(newLength, minSize, looseness, newCenter);
// 创建其他的7个子节点，连同旧的root，是8个子节点
// 作为新的根节点的孩子
if (oldRoot.HasAnyObjects())
{
// Create 7 new octree children to go with the old root as children of the new root
int rootPos = rootNode.BestFitChild(oldRoot.Center);
BoundsOctreeNode <T>[] children = new BoundsOctreeNode <T> [8];
for (int i = 0; i < 8; i++)
{
if (i == rootPos)
{
children[i] = oldRoot;
}
else
{
// i = 0, i%2 = 0
// i = 1, i%2 = 1
xDirection = i % 2 == 0 ? -1 : 1;
// 上下2层
yDirection = i > 3 ? -1 : 1;
zDirection = (i < 2 || (i > 3 && i < 6)) ? -1 : 1;
children[i] = new BoundsOctreeNode <T>(oldRoot.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>
/// 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;
Vector3 half = rootNode.BaseSize / 2;
Vector3 newLength = rootNode.BaseSize * 2;
Vector3 newCenter = rootNode.Center + new Vector3(xDirection * half.x, yDirection * half.y, zDirection * half.z);
// Create a new, bigger octree root node
rootNode = new BoundsOctreeNode <T>(newLength, minSize, looseness, newCenter);
if (oldRoot.HasAnyObjects())
{
// Create 7 new octree children to go with the old root as children of the new root
int rootPos = rootNode.BestFitChild(oldRoot.Center);
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>(oldRoot.BaseSize, minSize, looseness,
newCenter + new Vector3(xDirection * half.x, yDirection * half.y, zDirection * half.z));
}
}
// Attach the new children to the new root node
rootNode.SetChildren(children);
}
}