><a name="preSolve"></a><h3><p><code><span class="keyword">function</span> <a href="#preSolve"><span class="identifier">preSolve</span></a>(timeStep:<span class="type">Float</span>, invTimeStep:<span class="type">Float</span>):<span class="type">Void</span></code></p></h3><div class="doc"><p>@inheritDoc</p></div></div><div class="platform platform-types"><a name="solve"></a><h3><p><code><span class="keyword">function</span> <a href="#solve"><span class="identifier">solve</span></a>():<span class="type">Void