<i>DAMMIF</i>, a program for rapid<i>ab-initio</i>shape determination in small-angle scattering

<i>DAMMIF</i>, a revised implementation of the <i>ab</i>-<i>initio</i> shape-determination program <i>DAMMIN</i> for small-angle scattering data, is presented. The program was fully rewritten, and its algorithm was optimized for speed of execution and modified to avoid limitations due to the finite search volume. Symmetry and anisometry constraints can be imposed on the particle shape, similar to <i>DAMMIN</i>. In equivalent conditions, <i>DAMMIF</i> is 25-40 times faster than <i>DAMMIN</i> on a single CPU. The possibility to utilize multiple CPUs is added to <i>DAMMIF</i>. The application is available in binary form for major platforms.