New Mesh-Generation Code

void generateWorldMesh() {
    vertices.clear();
    for (int x = 0; x < SIZE; x++) {
        for (int y = 0; y < 7; y++) {
            for (int z = 0; z < SIZE; z++) {
                if (blocks[x][y][z] != 0) {
                    if (z != 0) {
                        if (blocks[x][y][z - 1] == 0) {
                            insertFace(x, y, z, 0, blocks[x][y][z]);
                        }
                    } else {
                        insertFace(x, y, z, 0, blocks[x][y][z]);
                    }
                    if (z != (SIZE - 1)) {
                        if (blocks[x][y][z + 1] == 0) {
                            insertFace(x, y, z, 1, blocks[x][y][z]);
                        }
                    } else {
                        insertFace(x, y, z, 1, blocks[x][y][z]);
                    }
                    if (x != 0) {
                        if (blocks[x - 1][y][z] == 0) {
                            insertFace(x, y, z, 2, blocks[x][y][z]);
                        }
                    } else {
                        insertFace(x, y, z, 2, blocks[x][y][z]);
                    }
                    if (x != (SIZE - 1)) {
                        if (blocks[x + 1][y][z] == 0) {
                            insertFace(x, y, z, 3, blocks[x][y][z]);
                        }
                    } else {
                        insertFace(x, y, z, 3, blocks[x][y][z]);
                    }
                    if (y != 7) {
                        if (blocks[x][y + 1][z] == 0) {
                            insertFace(x, y, z, 4, blocks[x][y][z]);
                        }
                    } else {
                        insertFace(x, y, z, 4, blocks[x][y][z]);
                    }
                    if (y != 0) {
                        if (blocks[x][y - 1][z] == 0) {
                            insertFace(x, y, z, 5, blocks[x][y][z]);
                        }
                    } else {
                        insertFace(x, y, z, 5, blocks[x][y][z]);
                    }
                }
            }
        }
    }
}