Computational Crystallography Toolbox
Table of Contents
- Introduction
- Installation
- Building a development version
- Contributing to the cctbx
- Nightly builds and tests
Introduction
The Computational Crystallography Toolbox (cctbx) is being developed as the open source component of the Phenix project. The goal of the Phenix project is to advance automation of macromolecular structure determination. Phenix depends on the cctbx, but not vice versa. This hierarchical approach enforces a clean design as a reusable library. The cctbx is therefore also useful for small-molecule crystallography and even general scientific applications.
The cctbx also provides some of the key component of the Olex 2 software. Olex 2 is dedicated to the workflow of small molecule crystallographic studies. It features a powerful and flexible refinement engine, olex2.refine, which is developed as part of the cctbx, in the smtbx top-module.
To maximize reusability and, maybe even more importantly, to give individual developers a notion of privacy, the cctbx is organized as a set of smaller modules. This is very much like a village (the cctbx project) with individual houses (modules) for each family (groups of developers, of any size including one).
The cctbx code base is available without restrictions and free of charge to all interested developers, both academic and commercial. The entire community is invited to actively participate in the development of the code base. A sophisticated technical infrastructure that enables community based software development is provided by GitHub. This service is also free of charge and open to the entire world.
The cctbx is designed with an open and flexible architecture to promote extendability and easy incorporation into other software environments. The package is organized as a set of ISO C++ classes with Python bindings. This organization combines the computational efficiency of a strongly typed compiled language with the convenience and flexibility of a dynamically typed scripting language in a strikingly uniform and very maintainable way.
Use of the Python interfaces is highly recommended, but optional. The cctbx can also be used purely as a C++ class library.
Installation
The easiest way to install cctbx is through the Conda package manager. We recommend the Miniforge installers since they provide a minimal environment and default to the conda-forge channel.
There are two packages available, cctbx and cctbx-base. The cctbx package is cctbx-base with some additional GUI packages (e.g. wxpython, pyside2, ipython).
With the conda command available, a new cctbx-base environment named my_env can be created with
conda create -n my_env -c conda-forge cctbx-base
To choose a specific version of Python, add the python package with the specific version
conda create -n my_env -c conda-forge cctbx-base python=3.11
Then the environment can be activated with
conda activate my_env
To install cctbx-base into the currently active environment, use
conda install -c conda-forge cctbx-base
The python package with a specific version can be added to change the version of python that is already installed in the active environment.
There are also regular python packages for cctbx-base and cctbx. They can
be installed with
pip install cctbx-base
Monomer library
Some programs in cctbx require information about geometric restraints for molecules. This information is available in the chem_data conda package from our releases. Download the chem_data conda package and install in your active environment with
conda install <chem_data package>
The chem_data package is built from the chem_data and geostd repositories.
Building a development version
- Download https://raw.githubusercontent.com/cctbx/cctbx_project/master/libtbx/auto_build/bootstrap.py in the directory where the cctbx and its dependencies shall be installed
- Run
python bootstrap.py(you may want to run it with the--helpoption first to discover the available options).
- For better compatibility with newer operating systems,
condapackages can be used for dependencies. Add the--use-condaflag and the command becomespython bootstrap.py --use-conda. This will run theminicondainstaller ifcondacannot be found. The environment with the dependencies will be located in theconda_basedirectory. See the description of the--use-condaflag from the--helpoutput for more details.
The installation will take a long while but the script will verbosely describe what it does.
Contributing to the cctbx
For a more detailed description on how to contribute to the cctbx please visit our contribution guide.
Nightly builds and tests
A nightly build of the conda packages are available on the cctbx-nightly channel. To use these packages, prepend -c cctbx-nightly as a channel to the commands above. For example, the command to create a new my_env environment would become
conda create -n my_env -c cctbx-nightly -c conda-forge cctbx-base
This will use the cctbx-base package from the cctbx-nightly channel, but pull the remaining dependencies from conda-forge.
There are also nightly builds for the regular python packages. They can be installed with
pip install -i https://test.pypi.org/simple/ --extra-index-url https://pypi.org/simple cctbx-base
The --extra-index-url flag may be needed if pip is not able to find the
other dependencies on TestPyPI.
Nightly builds are only updated if there are additional commits from the previous build.
A subset of tests is run on the current cctbx-base packages from the conda-forge and cctbx-nightly channels every night (10 pm Pacific) to test compatibility with the latest packages from conda-forge. Additional source files for fable and antlr3 are needed for the tests. The nightly test details can be viewed by clicking the "Nightly conda package tests" badge near the beginning of this README.
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Metadata
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Release files for cctbx-base 2025.11
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