void Triangle::merge( VertexArray& va ) {
free = dirty = true;
parent->dirty = true;
VertexArray::index_t* indices = va.triangle( index );
VertexArray::index_t* pindices = va.triangle( parent->index );
va.update_triangle( parent->index, pindices[2],
pindices[0], indices[0] );
va.update_triangle( index, 0, 0, 0 );
parent->set_neighbors( parent->neighbors[2],
neighbors[2], neighbors[0] );
parent->priority_data.midpoint_vector =
Vector3f( va.vertex( pindices[0] ) );
parent->priority_data.depth /= split_size;
if( neighbors[2]->neighbors[2] == this )
neighbors[2]->neighbors[2] = parent;
else if( neighbors[2]->neighbors[1] == this )
neighbors[2]->neighbors[1] = parent;
else
neighbors[2]->neighbors[0] = parent;
//va.remove_triangle( index );
}
