var a = CHUNK_SIZE - 1;

z = 0;

//generate terrain
for (var k = a; k >= 0; k--) {
	for (var j = a; j >= 0; j--) {
		for (var i = a; i >= 0; i--) {
			chunk[i][j][k] = BLOCKS_TEST;
		}
	}
}

//populate
for (var k = a; k >= 0; k--) {
	for (var j = a; j >= 0; j--) {
		for (var i = a; i >= 0; i--) {
			switch ( chunk[i][j][k] ) {
				case BLOCKS_TEST:
					var block_id = obj_block;
					break;
				default:
					break;
			}
			var block = instance_create_layer(x + BLOCK_SIZE * i, y + BLOCK_SIZE * j, "Terrain", block_id);
			with (block) {
				z = other.z + BLOCK_SIZE * k;
				chunk_id = other.id;
			}
		}
	}
}