/// <summary>
/// Constructs a root node.
/// </summary>
/// <param name="dimension">Dimension of root quad.</param>
/// <param name="maxHeight">Maximum height of node.</param>
public QuadNode(int dimension, float maxHeight)
{
// Store values
this.root = this;
this.level = 0;
this.hasChildren = false;
this.maxHeight = maxHeight;
this.rectangle = new Rectangle(0, 0, dimension, dimension);
this.parent = null;
this.children = new QuadNode[4];
// Calculate bounding box
this.boundingBox = new BoundingBox(
new Vector3(0, -maxHeight, 0),
new Vector3(rectangle.Width, maxHeight, rectangle.Height));
// Set transform
Vector3 origin = new Vector3(rectangle.X, 0, rectangle.Y);
this.matrix = Matrix.CreateTranslation(origin);
}