Visus should not create visus folder by default

[klacansky]

I run the following script and visus creates visus/cache empty directory while no cache directory was specified. Is this bug or desirable behavior?

import json
import numpy as np
import pathlib

import OpenVisus as ov

directory = pathlib.Path('static/open-scivis-datasets')

for dataset_dir in directory.iterdir():
    if not dataset_dir.is_dir():
        continue

    metadata = json.load(open(dataset_dir / f'{dataset_dir.name}.json', encoding='utf8'))

    filename = pathlib.Path(metadata['url']).name

    data = np.memmap(dataset_dir / filename, dtype=np.dtype(metadata['type']), mode='r', shape=(metadata['size'][2], metadata['size'][1], metadata['size'][0]))
    db = ov.CreateIdx(url=str(dataset_dir / f'{dataset_dir.name}.idx'), dims=list(reversed(data.shape)), fields=[ov.Field('data', metadata['type'])], arco='1mb')

    def generate_slices():
        for z in range(data.shape[0]): 
                yield data[z,:,:]
    db.writeSlabs(data)
    print(f'Compressing {dataset_dir}')
    db.compressDataset()

[scrgiorgio]

It seems it's a coded behavior. Line 298 file Kernel.cpp:

    Utils::setEnv("VISUS_CACHE", value);
    FileUtils::createDirectory(value); #

I am not sure if it can be removed without breaking something.