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  <tr bgcolor="#f0f0f0" class="even"><td class="entry"><b>ExternalForce</b>() (defined in <a class="el" href="class_s_p_h_1_1_external_force.html">SPH::ExternalForce</a>)</td><td class="entry"><a class="el" href="class_s_p_h_1_1_external_force.html">SPH::ExternalForce</a></td><td class="entry"></td></tr>
  <tr bgcolor="#f0f0f0"><td class="entry"><b>getPotential</b>(Vecd &amp;position) (defined in <a class="el" href="class_s_p_h_1_1_gravity.html">SPH::Gravity</a>)</td><td class="entry"><a class="el" href=