diff --git a/html/images/space.svg b/html/images/space.svg
index fb60405..70d6791 100644
--- a/html/images/space.svg
+++ b/html/images/space.svg
@@ -148,7 +148,7 @@
     const triangleContainer = document.querySelector('#triangles');
     const lineContainer = document.querySelector('#lines');
     const edgePts = wallCorners.map((pt, i) => [pt, wallCorners[(i + 1) % wallCorners.length]]);
-    const drawCollisionLines = false;
+    const drawCollisionLines = true;
 
     function drawEdges(lpts) {
       let edges = lpts.map(e => e.join(' '));
@@ -214,7 +214,6 @@
     function updateTriangles([positionX, positionY]) {
       const delim = ' ';
       const className = 'clockwise-orientation';
-      const visible = [];
 
       triangles.forEach(t => {
         const attr = t.getAttribute('points').split(delim);
@@ -253,10 +252,7 @@
           t.classList[isClockwise && !isAcute ? "add" : "remove"]("obtuse");
           t.classList[!isClockwise ? "add" : "remove"]("anti-clockwise");
         }
-        if (isClockwise && isAcute) visible.push(t);
       });
-
-      return visible;
     }
 
     function wrapPos(positionX, positionY) {