Cylindrical distribution function are a potent method to visualise preferred pairing/interaction modes in anisotropic systems such as liquid crystals. By using MDTraj for reading of simulation topologies and trajectories, cylindr is able to perform CDF analysis using the output of a number of popular MD simulation engines with little or no modification. We perform CDF analysis of a number of materials which form anisotropic phases of matter. For simulations with positional/orientational anisotropy, the CDF is complimentary to the commonly used radial distribution function, and preserves information about positional anisotropy.