//Helper function to draw OBB using Gizmos class
static public void Draw_OBB(Octree.OBB obb)
{
Vector3[] Positions = new Vector3[8];
Vector3 v = new Vector3(obb.e.x * obb.s.x, obb.e.y * obb.s.y, obb.e.z * obb.s.z);
Positions[0] = obb.c + (((obb.x - obb.c) * v.x) + ((obb.y - obb.c) * v.y) + ((obb.z - obb.c) * v.z));
Positions[1] = obb.c + (((obb.c - obb.x) * v.x) + ((obb.y - obb.c) * v.y) + ((obb.z - obb.c) * v.z));
Positions[2] = obb.c + (((obb.x - obb.c) * v.x) + ((obb.c - obb.y) * v.y) + ((obb.z - obb.c) * v.z));
Positions[3] = obb.c + (((obb.c - obb.x) * v.x) + ((obb.c - obb.y) * v.y) + ((obb.z - obb.c) * v.z));
Positions[4] = obb.c + (((obb.x - obb.c) * v.x) + ((obb.y - obb.c) * v.y) + ((obb.c - obb.z) * v.z));
Positions[5] = obb.c + (((obb.c - obb.x) * v.x) + ((obb.y - obb.c) * v.y) + ((obb.c - obb.z) * v.z));
Positions[6] = obb.c + (((obb.x - obb.c) * v.x) + ((obb.c - obb.y) * v.y) + ((obb.c - obb.z) * v.z));
Positions[7] = obb.c + (((obb.c - obb.x) * v.x) + ((obb.c - obb.y) * v.y) + ((obb.c - obb.z) * v.z));
Gizmos.color = Color.green;
Gizmos.DrawLine(Positions[0], Positions[1]);
Gizmos.DrawLine(Positions[1], Positions[3]);
Gizmos.DrawLine(Positions[3], Positions[2]);
Gizmos.DrawLine(Positions[2], Positions[0]);
Gizmos.DrawLine(Positions[4], Positions[5]);
Gizmos.DrawLine(Positions[5], Positions[7]);
Gizmos.DrawLine(Positions[7], Positions[6]);
Gizmos.DrawLine(Positions[6], Positions[4]);
//Connectors
Gizmos.DrawLine(Positions[0], Positions[4]);
Gizmos.DrawLine(Positions[1], Positions[5]);
Gizmos.DrawLine(Positions[3], Positions[7]);
Gizmos.DrawLine(Positions[2], Positions[6]);
}
//=====================================================================================================================
// Helper functions to Generate the Octree and then Pack it
//=====================================================================================================================
//send all scene Geometry(OBBs) to the Octree class
void StreamGeometry()
{
MeshRenderer[] allMesh = FindObjectsOfType(typeof(MeshRenderer)) as MeshRenderer[];
Octree.AABB volume = new Octree.AABB(); //this is the volume of the Octree Root node
Vector3 p = transform.position;
volume.Max.x = p.x + VoxelSize;
volume.Max.y = p.y + VoxelSize;
volume.Max.z = p.z + VoxelSize;
volume.Min.x = p.x - VoxelSize;
volume.Min.y = p.y - VoxelSize;
volume.Min.z = p.z - VoxelSize;
//All the AABBs
for (int i = 0; i < allMesh.Length; ++i)
{
if (allMesh[i].enabled == false)
{
continue;
}
//world position bounds
Octree.AABB meshAABB = new Octree.AABB();
meshAABB.Max = allMesh[i].bounds.max;
meshAABB.Min = allMesh[i].bounds.min;
if (IsInOctree(meshAABB, volume))
{
//Now Because Unity uses AABBs for all its bounds we first have to construct our own OBBs
Octree.OBB obb = new Octree.OBB();
Vector3 c = allMesh[i].bounds.center;
Mesh m = allMesh[i].gameObject.GetComponent <MeshFilter>().sharedMesh;
obb.c = c;
obb.e = m.bounds.extents;
obb.s = allMesh[i].transform.localScale;
//if it's a sphere use AABB instead
if (m == SphereExample)
{
obb.x = c + Vector3.right;
obb.y = c + Vector3.up;
obb.z = c + Vector3.forward;
}
else
{
obb.x = c + allMesh[i].transform.right;
obb.y = c + allMesh[i].transform.up;
obb.z = c + allMesh[i].transform.forward;
}
Octree.All_OBBs.Add(obb);
}
}
}
// Use this for initialization
void Awake()
{
meshRenderer = GetComponent <MeshRenderer>();
meshFilter = GetComponent <MeshFilter>();
obb = new Octree.OBB();
if (aabb == null)
{
aabb = new Octree.AABB();
aabb.Min = new Vector3(-size, -size, -size);
aabb.Max = new Vector3(size, size, size);
}
}
