const BlockType &left = Type(blocks[idx - 1]);
if (!left.fill.right) return false;
- const BlockType &top = Type(blocks[idx + Width()]);
- if (!top.fill.bottom) return false;
+ const BlockType &up = Type(blocks[idx + Width()]);
+ if (!up.fill.down) return false;
- const BlockType &bottom = Type(blocks[idx - Width()]);
- if (!bottom.fill.top) return false;
+ const BlockType &down = Type(blocks[idx - Width()]);
+ if (!down.fill.up) return false;
const BlockType &front = Type(blocks[idx + Width() * Height()]);
if (!front.fill.back) return false;