comment">// tracing
</span><span>      </span><span class="keyword">def</span><span> </span><span class="declaration-name">getNormal</span><span>(</span><span class="identifier">p</span><span>: </span><span class="identifier">vec3</span><span>, </span><span class="identifier">eps</span><span>: </span><span class="type-name">Float</span><span>): </span><span class="identifier">vec3</span><span> =
        </span><span class="keyword">var</span><span> </span><span class="identifier">n</span><span>: </span><spa