/// <summary>
/// Construye los nodos de un quadtree según el nivel
/// </summary>
/// <param name="nodes">Nodos</param>
/// <returns>Devuelve la lista de nodos superiores del quadtree</returns>
private SceneryNode[] BuildQuadtreeNodes(SceneryNode[] nodes)
{
int upperNodeCount = nodes.Length / 4;
int upperNodeSide = Convert.ToInt32(Math.Sqrt(nodes.Length));
List <SceneryNode> resultNodes = new List <SceneryNode>();
for (int y = 0; y < upperNodeSide; y += 2)
{
for (int x = 0; x < upperNodeSide; x += 2)
{
int start = (y * upperNodeSide) + x;
int indexA = start;
int indexB = start + 1;
int indexC = start + upperNodeSide;
int indexD = start + upperNodeSide + 1;
//Asignar nodos al nuevo nodo
SceneryNode newNode = new SceneryNode();
newNode.Build(
nodes[indexA],
nodes[indexB],
nodes[indexC],
nodes[indexD]);
resultNodes.Add(newNode);
}
}
return(resultNodes.ToArray());
}
/// <summary>
/// Obtiene la lista de nodos que tienen intersección con el AABB a partir del nodo especificado
/// </summary>
/// <param name="aabb">AABB</param>
/// <param name="node">Nodo inicial</param>
/// <param name="resultNodes">Obtiene la lista de nodos finales con intersección</param>
private void GetNodes(BoundingBox aabb, SceneryNode node, ref List <SceneryTriangleNode> resultNodes)
{
if (node != null)
{
if (node.HasChilds)
{
if (aabb.Contains(node.NorthEast.AABB) != ContainmentType.Disjoint)
{
this.GetNodes(aabb, node.NorthEast, ref resultNodes);
}
if (aabb.Contains(node.NorthWest.AABB) != ContainmentType.Disjoint)
{
this.GetNodes(aabb, node.NorthWest, ref resultNodes);
}
if (aabb.Contains(node.SouthEast.AABB) != ContainmentType.Disjoint)
{
this.GetNodes(aabb, node.SouthEast, ref resultNodes);
}
if (aabb.Contains(node.SouthWest.AABB) != ContainmentType.Disjoint)
{
this.GetNodes(aabb, node.SouthWest, ref resultNodes);
}
}
else
{
if (node is SceneryTriangleNode)
{
resultNodes.Add((SceneryTriangleNode)node);
}
}
}
}
protected override Scenery Read(ContentReader input, Scenery existingInstance)
{
Scenery scenery = existingInstance;
if (scenery == null)
{
scenery = new Scenery();
}
scenery.Terrain = input.ReadObject <Texture2D>();
scenery.TerrainBufferDeclaration = input.ReadObject <VertexDeclaration>();
scenery.TerrainBufferVertexStride = input.ReadInt32();
scenery.TerrainBuffer = input.ReadObject <VertexBuffer>();
scenery.TerrainBufferVertexCount = input.ReadInt32();
List <SceneryTriangleNode> nodes = new List <SceneryTriangleNode>();
int nodeCount = input.ReadInt32();
for (int i = 0; i < nodeCount; i++)
{
SceneryTriangleNode node = input.ReadObject <SceneryTriangleNode>();
nodes.Add(node);
}
SceneryNode root = BuildQuadtree(nodes.ToArray());
scenery.Root = root;
scenery.TerrainIndexBuffers.Add(LOD.High, input.ReadObject <IndexBuffer>());
scenery.TerrainIndexBuffers.Add(LOD.Medium, input.ReadObject <IndexBuffer>());
scenery.TerrainIndexBuffers.Add(LOD.Low, input.ReadObject <IndexBuffer>());
scenery.Effect = input.ReadObject <Effect>();
scenery.Texture1 = input.ReadObject <Texture2D>();
scenery.Texture2 = input.ReadObject <Texture2D>();
scenery.Texture3 = input.ReadObject <Texture2D>();
scenery.Texture4 = input.ReadObject <Texture2D>();
scenery.DetailTexture1 = input.ReadObject <Texture2D>();
scenery.DetailTexture2 = input.ReadObject <Texture2D>();
scenery.DetailTexture3 = input.ReadObject <Texture2D>();
scenery.DetailTexture4 = input.ReadObject <Texture2D>();
//Leer el efecto para renderizar billboards
scenery.BillboardEffect = input.ReadObject <Effect>();
scenery.BillboardGrassTexture = input.ReadObject <Texture2D>();
scenery.BillboardTreeTexture = input.ReadObject <Texture2D>();
return(scenery);
}
