/// <summary>
/// Creates a new chunk.
/// </summary>
/// <param name="world">The world this chunk belongs to.</param>
/// <param name="index">The index of the chunk.</param>
/// <param name="generateTerrain">True to generate some initial terrain, false to leave each block empty.</param>
private Chunk(World world, Vector3 index, bool generateTerrain)
{
_world = world;
_data = new ChunkData(index);
_terrain = new VoxelBuffer();
// create bounds
var sizeOffs = ChunkData.SizeXZ * 0.5f - 0.5f;
Vector3 boundsMin = new Vector3(
index.X - sizeOffs,
-0.5f,
index.Z - sizeOffs
);
Vector3 boundsMax = new Vector3(
index.X + sizeOffs,
0.5f + ChunkData.SizeY,
index.Z + sizeOffs
);
_bounds = new BoundingBox(boundsMin, boundsMax);
_octree = new ChunkOctree(_bounds);
// check if we need to populate
if (generateTerrain)
{
PopulateTerrain();
}
}
/// <summary>
/// Creates a new chunk.
/// </summary>
/// <param name="world">The world this chunk belongs to.</param>
/// <param name="index">The index of the chunk.</param>
/// <param name="generateTerrain">True to generate some initial terrain, false to leave each block empty.</param>
private Chunk( World world, Vector3 index, bool generateTerrain )
{
_world = world;
_data = new ChunkData( index );
_terrain = new VoxelBuffer();
// create bounds
var sizeOffs = ChunkData.SizeXZ * 0.5f - 0.5f;
Vector3 boundsMin = new Vector3(
index.X - sizeOffs,
-0.5f,
index.Z - sizeOffs
);
Vector3 boundsMax = new Vector3(
index.X + sizeOffs,
0.5f + ChunkData.SizeY,
index.Z + sizeOffs
);
_bounds = new BoundingBox( boundsMin, boundsMax );
_octree = new ChunkOctree( _bounds );
// check if we need to populate
if ( generateTerrain )
{
PopulateTerrain();
}
}
/// <summary>
/// Divides this octree into its eight children.
/// </summary>
private void Divide()
{
// make sure we haven't divided already
if (HasDivided)
{
throw new InvalidOperationException("This octree has already divided.");
}
// get helper variables
Vector3 center = _bounds.GetCenter();
Vector3 qdim = _bounds.GetDimensions() * 0.25f;
// get child centers
Vector3 trb = new Vector3(center.X + qdim.X, center.Y + qdim.Y, center.Z + qdim.Z);
Vector3 trf = new Vector3(center.X + qdim.X, center.Y + qdim.Y, center.Z - qdim.Z);
Vector3 brb = new Vector3(center.X + qdim.X, center.Y - qdim.Y, center.Z + qdim.Z);
Vector3 brf = new Vector3(center.X + qdim.X, center.Y - qdim.Y, center.Z - qdim.Z);
Vector3 tlb = new Vector3(center.X - qdim.X, center.Y + qdim.Y, center.Z + qdim.Z);
Vector3 tlf = new Vector3(center.X - qdim.X, center.Y + qdim.Y, center.Z - qdim.Z);
Vector3 blb = new Vector3(center.X - qdim.X, center.Y - qdim.Y, center.Z + qdim.Z);
Vector3 blf = new Vector3(center.X - qdim.X, center.Y - qdim.Y, center.Z - qdim.Z);
// create children
_children[0] = new ChunkOctree(new BoundingBox(tlb - qdim, tlb + qdim)); // top left back
_children[1] = new ChunkOctree(new BoundingBox(tlf - qdim, tlf + qdim)); // top left front
_children[2] = new ChunkOctree(new BoundingBox(trb - qdim, trb + qdim)); // top right back
_children[3] = new ChunkOctree(new BoundingBox(trf - qdim, trf + qdim)); // top right front
_children[4] = new ChunkOctree(new BoundingBox(blb - qdim, blb + qdim)); // bottom left back
_children[5] = new ChunkOctree(new BoundingBox(blf - qdim, blf + qdim)); // bottom left front
_children[6] = new ChunkOctree(new BoundingBox(brb - qdim, brb + qdim)); // bottom right back
_children[7] = new ChunkOctree(new BoundingBox(brf - qdim, brf + qdim)); // bottom right front
// go through our items and try to move them into children
for (int i = 0; i < _objects.Count; ++i)
{
for (int j = 0; j < 8; ++j)
{
if (_children[j].Add(_objects[i]))
{
// move the object from this tree to the child
_objects.RemoveAt(i);
--i;
break;
}
}
}
}
/// <summary>
/// Divides this octree into its eight children.
/// </summary>
private void Divide()
{
// make sure we haven't divided already
if ( HasDivided )
{
throw new InvalidOperationException( "This octree has already divided." );
}
// get helper variables
Vector3 center = _bounds.GetCenter();
Vector3 qdim = _bounds.GetDimensions() * 0.25f;
// get child centers
Vector3 trb = new Vector3( center.X + qdim.X, center.Y + qdim.Y, center.Z + qdim.Z );
Vector3 trf = new Vector3( center.X + qdim.X, center.Y + qdim.Y, center.Z - qdim.Z );
Vector3 brb = new Vector3( center.X + qdim.X, center.Y - qdim.Y, center.Z + qdim.Z );
Vector3 brf = new Vector3( center.X + qdim.X, center.Y - qdim.Y, center.Z - qdim.Z );
Vector3 tlb = new Vector3( center.X - qdim.X, center.Y + qdim.Y, center.Z + qdim.Z );
Vector3 tlf = new Vector3( center.X - qdim.X, center.Y + qdim.Y, center.Z - qdim.Z );
Vector3 blb = new Vector3( center.X - qdim.X, center.Y - qdim.Y, center.Z + qdim.Z );
Vector3 blf = new Vector3( center.X - qdim.X, center.Y - qdim.Y, center.Z - qdim.Z );
// create children
_children[ 0 ] = new ChunkOctree( new BoundingBox( tlb - qdim, tlb + qdim ) ); // top left back
_children[ 1 ] = new ChunkOctree( new BoundingBox( tlf - qdim, tlf + qdim ) ); // top left front
_children[ 2 ] = new ChunkOctree( new BoundingBox( trb - qdim, trb + qdim ) ); // top right back
_children[ 3 ] = new ChunkOctree( new BoundingBox( trf - qdim, trf + qdim ) ); // top right front
_children[ 4 ] = new ChunkOctree( new BoundingBox( blb - qdim, blb + qdim ) ); // bottom left back
_children[ 5 ] = new ChunkOctree( new BoundingBox( blf - qdim, blf + qdim ) ); // bottom left front
_children[ 6 ] = new ChunkOctree( new BoundingBox( brb - qdim, brb + qdim ) ); // bottom right back
_children[ 7 ] = new ChunkOctree( new BoundingBox( brf - qdim, brf + qdim ) ); // bottom right front
// go through our items and try to move them into children
for ( int i = 0; i < _objects.Count; ++i )
{
for ( int j = 0; j < 8; ++j )
{
if ( _children[ j ].Add( _objects[ i ] ) )
{
// move the object from this tree to the child
_objects.RemoveAt( i );
--i;
break;
}
}
}
}
