2d always assume \(\theta_{0,0,r} = 0\) for all relative positions
\(r\).
Additionally, each family of restrictions may introduce other restrictions:"><meta property="og:image" content="https://freguglia.github.io/mrf2d/logo.png"><!-- mathjax --><script src="https://cdnjs.cloudflare.com/ajax/libs/mathjax/2.7.5/MathJax.js" integrity="sha256-nvJJv9wWKEm88qvoQl9ekL2J+k/RWIsaSScxxlsrv8k=" crossorigin="anonymous"></script><script src="https://cdnjs.cloudflare.com/ajax/libs/mathjax/2.7.5/config/TeX-AMS-MML_HTMLor