//=====================================================================================================================
// 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);
}
}
}
bool IsInOctree(Octree.AABB A, Octree.AABB B)
{
//http://www.miguelcasillas.com/?p=30
return(A.Max.x > B.Min.x &&
A.Min.x < B.Max.x &&
A.Max.y > B.Min.y &&
A.Min.y < B.Max.y &&
A.Max.z > B.Min.z &&
A.Min.z < B.Max.z);
}
// 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);
}
}
