COMPAS CRA
Coupled Rigid-Block Analysis (CRA) implementation using COMPAS framework.
developed with ♥ by Gene Ting-Chun Kao
Installation
pip install compas_cra
Nothing else is needed on Windows, macOS (Apple Silicon and Intel) or Linux. The
IPOPT 3.14.19 solver (Eclipse Public License 2.0,
MUMPS linear solver, no HSL) is compiled into the package itself as an extension
module built with nanobind, so solving happens
in-process — one pip install, no separate solver package, no solver executables, no
subprocess, no conda. See native/README.md for how the
extension is built and packaging/README.md for the IPOPT
build itself.
Local development
The solver is compiled into the package, so an install from source builds it, and that needs IPOPT staged first:
git clone https://github.com/BlockResearchGroup/compas_cra.git
cd compas_cra
uv venv --python 3.12
source .venv/Scripts/activate # .venv/bin/activate on macOS and Linux
uv pip install invoke compas_invocations2
invoke setup # toolchain + IPOPT (~15 minutes, once) + editable install
invoke test
invoke setup handles the platform differences — MSYS2 packages on Windows, Homebrew
on macOS, and on Linux it prints the apt/dnf line to run first. Without a local
toolchain, CIBW_BUILD="cp312-*" cibuildwheel builds the wheel inside the manylinux
container instead — the build is configured in pyproject.toml, so that one command
reproduces CI. Full instructions, per platform, are in
the installation docs.
Rhino 8
The easiest way is to let the ScriptEditor install everything for you. Start a new
Python 3 script with this header and run it — on the first run Rhino installs
compas_cra and all of its dependencies into its own environment (this takes a
couple of minutes, watch the progress in the ScriptEditor console):
#! python3
# venv: compas-cra
# r: compas_cra
No extra # r: lines are needed for compas, numpy or shapely — they are
dependencies of compas_cra and pip installs them automatically, and the solver is
inside the compas_cra wheel itself.
Ready-to-run examples for the ScriptEditor are in scripts/:
scripts/rhino_cra_cubes.py— three stacked cubes, baked as wireframe blocks with interface outlines and resultant contact forces.scripts/rhino_cra_arch.py— a parametric masonry arch (span, rise, thickness, number of voussoirs, friction) solved and baked the same way.
Alternatively, install manually into Rhino's Python with the shell that ships with
Rhino (Tools > Options > Plugins > Rhino Code > Open Shell, or
~/.rhinocode/py39-rh8/shell/open-shell on macOS):
pip install compas_cra
Note that Rhino 8 ships CPython 3.9, which is fully supported: solver wheels exist for
CPython 3.9–3.13 on all platforms. Since the solver is a regular Python extension
module rather than an executable, it is also not affected by the antivirus policies
that quarantine unknown .exe files on managed Windows machines. To verify the solver
in any environment, run scripts/rhino_ipopt_check.py.
To find out more about CRA, please refer to our paper in the CAD Computer-Aided Design journal: https://doi.org/10.1016/j.cad.2022.103216
Coupled Rigid-Block Analysis: Stability-Aware Design of Complex Discrete-Element Assemblies
Abstract
The rigid-block equilibrium (RBE) method uses a penalty formulation to measure structural infeasibility or to guide the design of stable discrete-element assemblies from unstable geometry. However, RBE is a purely force-based formulation, and it incorrectly describes stability when complex interface geometries are involved. To overcome this issue, this paper introduces the coupled rigid-block analysis (CRA) method, a more robust approach building upon RBE’s strengths. The CRA method combines equilibrium and kinematics in a penalty formulation in a nonlinear programming problem. An extensive benchmark campaign is used to show how CRA enables accurate modelling of complex three-dimensional discrete-element assemblies formed by rigid blocks. In addition, an interactive stability-aware design process to guide user design towards structurally-sound assemblies is proposed. Finally, the potential of our method for real-world problems are demonstrated by designing complex and scaffolding-free physical models.
Please cite our work if you use CRA in your research
Paper
@article{kao2022coupled,
title = {Coupled Rigid-Block Analysis: Stability-Aware Design of Complex Discrete-Element Assemblies},
author = {Kao, Gene Ting-Chun and Iannuzzo, Antonino and Thomaszewski, Bernhard and Coros, Stelian and Van Mele, Tom and Block, Philippe},
journal = {Computer-Aided Design},
volume = {146},
pages = {103216},
year = {2022},
publisher = {Elsevier},
doi = {10.1016/j.cad.2022.103216},
url = {https://doi.org/10.1016/j.cad.2022.103216}
}
Software implementation
@misc{compas-cra,
title = {{COMPAS CRA}: Coupled Rigid-Block Analysis ({CRA}) for the {COMPAS} framework},
author = {Kao, Gene Ting-Chun},
note = {https://github.com/BlockResearchGroup/compas\_cra},
year = {2020-2022},
doi = {10.5281/zenodo.7043135},
url = {https://doi.org/10.5281/zenodo.7043135},
}
Read the docs
https://github.com/BlockResearchGroup/compas_cra
Examples to reproduce our paper results
See examples in docs or try them in docs/examples.
3 maintainers
Metadata
3 maintainers
Release files for compas-cra 0.8.0
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