/* Continue kd-tree setup, create intermediary or leaf nodes as required. */
void VertexBufferNode::setupTree( VertexData& data, const Index start,
const Index length, const Axis axis,
const size_t depth,
VertexBufferData& globalData,
boost::progress_display& progress )
{
data.sort( start, length, axis );
const Index median = start + ( length / 2 );
// left child will include elements smaller than the median
const Index leftLength = length / 2;
const bool subdivideLeft = _subdivide( leftLength, depth );
if( subdivideLeft )
_left = new VertexBufferNode;
else
_left = new VertexBufferLeaf( globalData );
// right child will include elements equal to or greater than the median
const Index rightLength = ( length + 1 ) / 2;
const bool subdivideRight = _subdivide( rightLength, depth );
if( subdivideRight )
_right = new VertexBufferNode;
else
_right = new VertexBufferLeaf( globalData );
// move to next axis and continue contruction in the child nodes
const Axis newAxisLeft = subdivideLeft ?
data.getLongestAxis( start , leftLength ) : AXIS_X;
const Axis newAxisRight = subdivideRight ?
data.getLongestAxis( median, rightLength ) : AXIS_X;
static_cast< VertexBufferNode* >
( _left )->setupTree( data, start, leftLength, newAxisLeft, depth+1,
globalData, progress );
static_cast< VertexBufferNode* >
( _right )->setupTree( data, median, rightLength, newAxisRight, depth+1,
globalData, progress );
if( depth == 3 )
++progress;
}
/* Finish partial setup - sort, reindex and merge into global data. */
void VertexBufferLeaf::setupTree( VertexData& data, const Index start,
const Index length, const Axis axis,
const size_t depth,
VertexBufferData& globalData )
{
data.sort( start, length, axis );
_vertexStart = globalData.vertices.size();
_vertexLength = 0;
_indexStart = globalData.indices.size();
_indexLength = 0;
const bool hasColors = ( data.colors.size() > 0 );
// stores the new indices (relative to _start)
map< Index, ShortIndex > newIndex;
for( Index t = 0; t < length; ++t )
{
for( Index v = 0; v < 3; ++v )
{
Index i = data.triangles[start + t][v];
if( newIndex.find( i ) == newIndex.end() )
{
newIndex[i] = _vertexLength++;
// assert number of vertices does not exceed SmallIndex range
MESHASSERT( _vertexLength );
globalData.vertices.push_back( data.vertices[i] );
if( hasColors )
globalData.colors.push_back( data.colors[i] );
globalData.normals.push_back( data.normals[i] );
}
globalData.indices.push_back( newIndex[i] );
++_indexLength;
}
}
#ifndef NDEBUG
MESHINFO << "VertexBufferLeaf::setupTree"
<< "( " << _indexStart << ", " << _indexLength << "; start "
<< _vertexStart << ", " << _vertexLength << " vertices)." << endl;
#endif
}