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<p>Calculate the contact forces and moments due to this model. </p>
<p>Given a set of collision or bond geometries representing the contact interaction, this method calculates the resulting contact forces and moments and stores them in the provided <code><a class="el" href="classnetdem_1_1_contact_forces.html" title="A class representing the contact forces and moments arising from a contact interaction.">ContactForces</a></code> object. This is a pure vi