public QuadTree(ref Terrain terrain)
{
terrainRef = terrain;
// the number of leaves to create
//totalLeaves = terrainRef.PatchesPerRow;
// calculate the last level where the nodes are being referenced to the patches (each node to one patch)
//maxLevels = CalcMaxLevels(totalLeaves);
// generate the main node with the 4 bounding box vertices
int[] BoundingBox = new int[4];
BoundingBox[1] = terrain.Width - 1;
BoundingBox[2] = (terrain.Height - 1) * terrain.Width;
BoundingBox[3] = ((terrain.Height - 1) * terrain.Width) + (terrain.Width - 1);
mainNode = new QuadTreeNode(0,
terrain.Vertices[BoundingBox[0]],
terrain.Vertices[BoundingBox[1]],
terrain.Vertices[BoundingBox[2]],
terrain.Vertices[BoundingBox[3]]);
AssignBoundingBox3D(ref mainNode, BoundingBox[0], BoundingBox[1], BoundingBox[2], BoundingBox[3]);
Debug.Trace("BB: Level " + 1 + " -> " + BoundingBox[0] + " " + BoundingBox[1] + " " + BoundingBox[2] + " " + BoundingBox[3]);
// since its the first node, it gets the first id.
mainNode.ID = 0;
QuadTreeNode parent = null;
GenerateQuadtreeBranch(ref parent, ref mainNode, BoundingBox);
Debug.Trace("(Class: Quadtree) Quadtree generated");
}
public Planet()
{
int tex0 = Texture.loadFromFile("earthcubemap_tex_c04.bmp");
int tex1 = Texture.loadFromFile("earthcubemap_tex_c02.bmp");
int tex2 = Texture.loadFromFile("earthcubemap_tex_c05.bmp");
int tex3 = Texture.loadFromFile("earthcubemap_tex_c03.bmp");
int tex4 = Texture.loadFromFile("earthcubemap_tex_c00.bmp");
int tex5 = Texture.loadFromFile("earthcubemap_tex_c01.bmp");
planetFace = new Terrain[counter];
planetFaceQT = new QuadTree[counter];
// The number of patches MUST be divisible by pow 4.
// Left face:
planetFace[0] = new Terrain(new Vector3(-(terrainSize / 2), -(terrainSize / 2), -(terrainSize / 2)),
new Vector3(1.0f, 0.0f, 0.0f),
new Vector3(0.0f, 1.0f, 0.0f),
maxLOD,
terrainSize,
patchSize,
planetRadius,
tex0,
"earthcubemap_c04.jpg");
// Top face:
planetFace[1] = new Terrain(new Vector3(-(terrainSize / 2), (terrainSize / 2) - 1, -(terrainSize / 2)),
new Vector3(1.0f, 0.0f, 0.0f),
new Vector3(0.0f, 0.0f, 1.0f),
maxLOD,
terrainSize,
patchSize,
planetRadius,
tex1,
"earthcubemap_c02.jpg");
// Right face:
planetFace[2] = new Terrain(new Vector3((terrainSize / 2) - 1, -(terrainSize / 2) - 1, (terrainSize / 2) - 1),
new Vector3(-1.0f, 0.0f, 0.0f),
new Vector3(0.0f, 1.0f, 0.0f),
maxLOD,
terrainSize,
patchSize,
planetRadius,
tex2,
"earthcubemap_c05.jpg");
// Bottom face:
planetFace[3] = new Terrain(new Vector3((terrainSize / 2) - 1, -(terrainSize / 2), -(terrainSize / 2)),
new Vector3(-1.0f, 0.0f, 0.0f),
new Vector3(0.0f, 0.0f, 1.0f),
maxLOD,
terrainSize,
patchSize,
planetRadius,
tex3,
"earthcubemap_c03.jpg");
planetFaceQT[3] = new QuadTree(ref planetFace[3]);
// Front face:
planetFace[4] = new Terrain(new Vector3(-(terrainSize / 2), (terrainSize / 2) - 1, -(terrainSize / 2)),
new Vector3(0.0f, 0.0f, 1.0f),
new Vector3(0.0f, -1.0f, 0.0f),
maxLOD,
terrainSize,
patchSize,
planetRadius,
tex4,
"earthcubemap_c00.jpg");
// Back face:
planetFace[5] = new Terrain(new Vector3((terrainSize / 2) - 1, -(terrainSize / 2), -(terrainSize / 2)),
new Vector3(0.0f, 0.0f, 1.0f),
new Vector3(0.0f, 1.0f, 0.0f),
maxLOD,
terrainSize,
patchSize,
planetRadius,
tex5,
"earthcubemap_c01.jpg");
// Generate the first node and assign manually the boundingbox.
mainNode = new QuadTreeNode(0, Vector3.Zero, Vector3.Zero, Vector3.Zero, Vector3.Zero);
mainNode.BoundingBox3D[0] = new Vector3(-(terrainSize / 2), -(terrainSize / 2), (terrainSize / 2));
mainNode.BoundingBox3D[1] = new Vector3((terrainSize / 2), -(terrainSize / 2), (terrainSize / 2));
mainNode.BoundingBox3D[2] = new Vector3(-(terrainSize / 2), -(terrainSize / 2), -(terrainSize / 2));
mainNode.BoundingBox3D[3] = new Vector3((terrainSize / 2), -(terrainSize / 2), -(terrainSize / 2));
mainNode.BoundingBox3D[4] = new Vector3(-(terrainSize / 2), (terrainSize / 2), (terrainSize / 2));
mainNode.BoundingBox3D[5] = new Vector3((terrainSize / 2), (terrainSize / 2), (terrainSize / 2));
mainNode.BoundingBox3D[6] = new Vector3(-(terrainSize / 2), (terrainSize / 2), -(terrainSize / 2));
mainNode.BoundingBox3D[7] = new Vector3((terrainSize / 2), (terrainSize / 2), -(terrainSize / 2));
// Since its the first node, it gets the first id.
mainNode.ID = -1;
Debug.Trace("BB: Level " + -1 + " -> Generated");
// Calculate and assign the nodes neighbors.
for (int i = 0; i < counter; i++)
{
planetFaceQT[i] = new QuadTree(ref planetFace[i]);
planetFaceQT[i].MainNode.Parent = mainNode;
//QuadTreeNode mNode = planetFaceQT[i].MainNode;
//QuadTree.CalculateQuadtreeNeighbors(ref mNode);
}
// Since there are six terrain faces to create the sphere, there is need to assign the missing border neighbors manually.
// Neighbors for the left face:
planetFaceQT[0].MainNode.Neighbor_N = planetFaceQT[1].MainNode;
planetFaceQT[0].MainNode.Neighbor_E = planetFaceQT[5].MainNode;
planetFaceQT[0].MainNode.Neighbor_S = planetFaceQT[3].MainNode;
planetFaceQT[0].MainNode.Neighbor_W = planetFaceQT[4].MainNode;
// Neighbors for the top face:
planetFaceQT[1].MainNode.Neighbor_N = planetFaceQT[2].MainNode;
planetFaceQT[1].MainNode.Neighbor_E = planetFaceQT[5].MainNode;
planetFaceQT[1].MainNode.Neighbor_S = planetFaceQT[0].MainNode;
planetFaceQT[1].MainNode.Neighbor_W = planetFaceQT[4].MainNode;
// Neighbors for the right face:
planetFaceQT[2].MainNode.Neighbor_N = planetFaceQT[3].MainNode;
planetFaceQT[2].MainNode.Neighbor_E = planetFaceQT[4].MainNode;
planetFaceQT[2].MainNode.Neighbor_S = planetFaceQT[1].MainNode;
planetFaceQT[2].MainNode.Neighbor_W = planetFaceQT[5].MainNode;
// Neighbors for the bottom face:
planetFaceQT[3].MainNode.Neighbor_N = planetFaceQT[0].MainNode;
planetFaceQT[3].MainNode.Neighbor_E = planetFaceQT[4].MainNode;
planetFaceQT[3].MainNode.Neighbor_S = planetFaceQT[2].MainNode;
planetFaceQT[3].MainNode.Neighbor_W = planetFaceQT[5].MainNode;
// Neighbors for the front face:
planetFaceQT[4].MainNode.Neighbor_N = planetFaceQT[2].MainNode;
planetFaceQT[4].MainNode.Neighbor_E = planetFaceQT[1].MainNode;
planetFaceQT[4].MainNode.Neighbor_S = planetFaceQT[0].MainNode;
planetFaceQT[4].MainNode.Neighbor_W = planetFaceQT[3].MainNode;
// Neighbors for the back face:
planetFaceQT[5].MainNode.Neighbor_N = planetFaceQT[2].MainNode;
planetFaceQT[5].MainNode.Neighbor_E = planetFaceQT[3].MainNode;
planetFaceQT[5].MainNode.Neighbor_S = planetFaceQT[0].MainNode;
planetFaceQT[5].MainNode.Neighbor_W = planetFaceQT[1].MainNode;
// Calculate and assign the missing nodes neighbors.
for (int i = 0; i < counter; i++)
{
QuadTreeNode mNode = planetFaceQT[i].MainNode;
QuadTree.CalculateQuadtreeNeighbors(ref mNode);
}
Debug.Trace("Planet generated!");
}
