 use strings from
                <code>MATERIAL_COEFFICIENTS</code></p>
              <dl class="dl-compact">
              </dl>
              <h3 id=".DEFAULT_SOURCE_DISTANCE" class="symbol-name">DEFAULT_SOURCE_DISTANCE</h3>
              <div class="symbol-detail-labels"><span class="label label-static"><small>static</small></span></div>
              <p class="type-signature">Number</p>
              <p>Default distance from listener when setting angle.</p>
              <dl class="dl-compact">
       