OpenViSUS Visualization project

Mission

The mission of ViSUS.org is to provide support for the scientific community with Big Data, management, analysis and visualization tools.

In this website we provide access to open source software tools and libraries such as the ViSUS framework and the PIDX library. These softwares are distributed under the permissive BSD license (see LICENSE file).

Installation

For conda see docs/conda-installation.md.

Make sure pip is installed, updated and in PATH.

pip install --upgrade OpenVisus
# configure OpenVisus (one time)
python -m OpenVisus configure 
# test installation
python -c "from OpenVisus import *"

Notes:

if you get permission denied error, use pip install --user.
if you need a minimal installation without the GUI replace OpenVisus with OpenVisusNoGui
If you want to create an isolated virtual environment with virtualenv:

# make sure venv is latest
pip install --upgrade virtualenv
# create a virtual environment in current directory
venv ./ovenv
# activate the virtual environment
source ./ovenv/bin/activate

Run the OpenVisus viewer:

python -m OpenVisus viewer

Handle with PyQt errors

Sometimes, PyQt (or other packages like pyqt5-sip) is already installed in system and OpenVisus viewer gets confused which package to use.

To solve that issue, follow these steps before main installation:

If on linux, make sure PyQt5 or any of it's related packages are not installed system-wide.
- For Ubuntu use sudo apt remove python3-pyqt5 to remove pyqt5 and all other related packages listed here.
- For any Arch based distro, use sudo pacman -Rs python-pyqt5. Same for all other packages like python-pyqt5-sip.
Remove all pyqt5 packages with pip:
- pip uninstall pyqt5 PyQt5-sip

Documentation

You can find OpenViSUS documentation regarding the install, configuration, viewer, and Python package here.

Quick Tour and Tutorials

Start with quick_tour.ipynb Jupyter Notebook.

See Samples/jupyter directory.

To run the tutorials on the cloud click this binder link.

VISUS_IDX2

Links:

https://github.com/sci-visus/idx2.git

if you are debugging in Windows (change as needed):

SET PATH=%PATH%;C:\Python310;C:\Python310\Lib\site-packages\PyQt5\Qt\bin;c:\projects\OpenVisus\build\RelWithDebInfo\OpenVisus\bin
SET VISUS_VERBOSE_DISKACCESS=0
SET VISUS_CPP_VERBOSE=0

Download a test file from here:

curl -L https://github.com/sci-visus/OpenVisus/releases/download/files/MIRANDA-DENSITY-.384-384-256.-Float64.raw -O
python.exe Samples/python/extract_slices.py MIRANDA-DENSITY-.384-384-256.-Float64.raw  384 384 256 float64 ./tmp/input

Test pure IDX2, with IDX2 legacy file format (not cachable, not cloud-ready)

set VISUS_IDX2_USE_LEGACY_FILE_FORMAT=1

# this will create 
#    `tmp/legagy/Miranda/Density.idx` 
#    `tmp/legacy/Miranda/Density/L00.bin`

rmdir /S /Q tmp\legacy
visus.exe idx2 --encode "MIRANDA-DENSITY-.384-384-256.-Float64.raw" --name Miranda --field Density --dims 384 384 256 --type float64 --tolerance 1e-16 --num_levels 2 --out_dir tmp/legacy

# this will extract some data from the IDX2 file and `L*.bin` files
#   NOTE the dimension are 1+value/2
cd tmp\legacy
visus.exe idx2 --decode Miranda/Density.idx2 --downsampling 1 1 1 --tolerance 0.001 --out_file "output.legacy.raw"
python.exe ../../Samples/python/extract_slices.py output.legacy.raw 193 193 129 float64 ./decoded

cd ..

unset VISUS_IDX2_USE_LEGACY_FILE_FORMAT

Then test using one-chunk per file (useful for CloudAccess, DiskAccess etc):

you will see a lot of files, one per block/chunk
probably blocks are too small

# this will create 
#    `tmp/arco/Miranda/Density.idx` and 
#    `tmp/arco/Miranda/Density/0==<timestep>/Density==<fieldname>/0000/0000/0000/0000.bin`

rmdir /S /Q tmp\arco
visus.exe idx2 --encode MIRANDA-DENSITY-.384-384-256.-Float64.raw --name Miranda --field Density --dims  384 384 256 --type float64 --tolerance 1e-16 --num_levels 2 --out_dir tmp/arco

# NOTE: don't need to compress since the compression/decompression is really the IDX encoding/decoding
# in fact you will see blocks of different sizes

# export the output (NOTE the dimension are 1+value/2)
#   NOTE the dimension are 1+value/2
cd tmp\arco
visus.exe idx2  --decode "Miranda\Density.idx2" --downsampling 1 1 1 --tolerance 0.001 --out_file output.arco.raw
python.exe ../../Samples/python/extract_slices.py output.arco.raw 193 193 129 float64 ./decoded
cd ..\..

# (OPTIONAL) if you want the data on the cloud
#   e.g.  s3://utah/idx2/Miranda/Density.idx2
#   e.g.  s3://utah/idx2/Miranda/Density/0/Density/0000/0000/0000/0000.bin
aws s3 --profile sealstorage --no-verify-ssl sync ./tmp/arco/Miranda s3://utah/idx2/Miranda/

You can create a visus.config with:

NOTE: compression will be automatically set to raw since the compression/decompression is really IDX2 encoding/decoding

  current implementation does read blocks (i.e. IDX2 chunks) serially so first network access will be SLOW. Caching will help later.

  atomic IO operation are "chunk" reading. Need to investigate if a chunk is made of mantissa/exponent or is selectively possible to read piece of info (IMPORTANT!)

<dataset name="idx2-legacy"   url="tmp/legacy/Miranda/Density.idx2?legacy=1" />
<dataset name="idx2-arco"     url='tmp/arco/Miranda/Density.idx2' />
<dataset name="idx2-cloud"    url='https://maritime.sealstorage.io/api/v0/s3/utah/idx2/Miranda/Density.idx2?profile=sealstorage&amp;cached=arco' />

sci-visus/OpenVisus