parseSplatOctreeIndex function

SplatOctree parseSplatOctreeIndex(Uint8List bytes)

The tree's nodes out of the header and table, every page still to load.

Implementation

SplatOctree parseSplatOctreeIndex(Uint8List bytes) {
  final nodeCount = _readHeader(bytes);
  final needed = kSplatOctreeHeaderBytes + nodeCount * kSplatOctreeNodeBytes;
  if (bytes.length < needed || nodeCount == 0) {
    throw SplatOctreeException(
      '$nodeCount nodes need a $needed-byte index; got ${bytes.length}',
    );
  }
  final data = ByteData.sublistView(bytes);
  final nodes = <SplatOctreeNode>[
    for (var k = 0; k < nodeCount; k++)
      _node(data, kSplatOctreeHeaderBytes + k * kSplatOctreeNodeBytes),
  ];
  for (final (k, node) in nodes.indexed) {
    if (node.childCount > 8 ||
        (node.childCount > 0 &&
            (node.firstChild <= k ||
                node.firstChild + node.childCount > nodeCount))) {
      throw SplatOctreeException('node $k names children outside the tree');
    }
  }
  return SplatOctree(nodes);
}