// traversal implementation
private void tree_traversal(int iBox, int depth, TreeTraversal traversal)
{
int idx = box_to_index[iBox];
if (idx < triangles_end)
{
// triange-list case, array is [N t1 t2 ... tN]
int n = index_list[idx];
for (int i = 1; i <= n; ++i)
{
int ti = index_list[idx + i];
traversal.NextTriangleF(ti);
}
}
else
{
int i0 = index_list[idx];
if (i0 < 0)
{
// negative index means we only have one 'child' box to descend into
i0 = (-i0) - 1;
if (traversal.NextBoxF(get_box(i0), depth + 1))
{
tree_traversal(i0, depth + 1, traversal);
}
}
else
{
// positive index, two sequential child box indices to descend into
i0 = i0 - 1;
if (traversal.NextBoxF(get_box(i0), depth + 1))
{
tree_traversal(i0, depth + 1, traversal);
}
int i1 = index_list[idx + 1] - 1;
if (traversal.NextBoxF(get_box(i1), depth + 1))
{
tree_traversal(i1, depth + 1, traversal);
}
}
}
}
