/// <summary>
/// Create internal octree node (eg not the root octree node).
/// </summary>
internal OctreeCullingNode(OctreeCullingNode parent, Vector3 index, BoundingBox boundingBox, uint divisionsLeft)
{
// store octree data and init
_parentOctree = parent;
_indexInParent = index;
_octreeData = parent._octreeData;
_divisionsLeft = divisionsLeft;
InitOctreeBox(boundingBox);
}
/// <summary>
/// Add a new child node into one of the subdivision branches.
/// This also create the subdivision octree if needed.
/// </summary>
protected void AddToSubTree(Node node, int x, int y, int z)
{
// create the subdivision branch if needed
if (_childOctrees[x, y, z] == null)
{
_childOctrees[x, y, z] = new OctreeCullingNode(this, new Vector3(x, y, z), _childBoundingBoxes[x, y, z], _divisionsLeft - 1);
}
// add child node to branch
_childOctrees[x, y, z].PushToTree(node);
}
/// <summary>
/// Called whenever we need to remove a node from the octree.
/// </summary>
/// <param name="node">Node to push into tree.</param>
protected void RemoveFromTree(Node node)
{
// remove from all octree nodes
foreach (Node linked in node.LinkedNodes)
{
OctreeCullingNode octreeNode = linked as OctreeCullingNode;
if (octreeNode != null)
{
octreeNode.RemoveFromSelf(node);
}
}
}