BlockSystemRenderer.java 文件源码

private Set<EnumFacing> getVisibleFacings(BlockPos pos) {
    VisGraph visibility = new VisGraph();
    BlockPos cornerPos = new BlockPos(pos.getX() >> 4 << 4, pos.getY() >> 4 << 4, pos.getZ() >> 4 << 4);
    Chunk chunk = this.blockSystem.getChunkFromBlockCoords(cornerPos);
    for (BlockPos.MutableBlockPos blockPos : BlockPos.getAllInBoxMutable(cornerPos, cornerPos.add(15, 15, 15))) {
        if (chunk.getBlockState(blockPos).isOpaqueCube()) {
            visibility.setOpaqueCube(blockPos);
        }
    }
    return visibility.getVisibleFacings(pos);
}