x</span><span>),
            </span><span class="identifier">u</span><span>.</span><span class="identifier">y</span><span>
          )

      </span><span class="comment">// lighting
</span><span>      </span><span class="keyword">def</span><span> </span><span class="declaration-name">diffuse</span><span>(</span><span class="identifier">n</span><span>: </span><span class="identifier">vec3</span><span>, </span><span class="identifier">l</span><span>: </span><span class="identifier">vec3</span><span>, </span>