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\section{Visualization}  \label{sec:vis}  Visualization plays a major role in any analysis of simulation data, and the ability to directly visualize the spatial structure and evolution  of a system is often crucial to generating insight. While the guiding principle of the \code{gadfly} project is to avoid reinventing the wheel, instead relying on the tools developed by the broader scientific python ecosystem community  wherever possible, SPH particle rendering is one critical area where that broader ecosystem proves insufficient. To mitigate this shortcoming, \code{gadfly} includes a minimal library of SPH visualization tools.  The SPH particle rendering algorithm at the core of \code{gadfly}'s visualization tools is designed for projecting three-dimensional gas density distributions down to a two-dimensional image; an example of such a visualization produced by gadfly is shown in Figure \ref{fig:vis}.