diff --git a/html/images/space.svg b/html/images/space.svg
index 4c418bf..9c0ca19 100644
--- a/html/images/space.svg
+++ b/html/images/space.svg
@@ -168,6 +168,7 @@
     const triangleContainer = document.querySelector('#triangles');
     const lineContainer = document.querySelector('#lines');
     const trianglePts = points.map((pt, i) => [pt, points[(i + 1) % points.length]]);
+    const drawCollisionLines = false;
 
     function drawEdges(lpts) {
       let edges = lpts.map(e => e.join(' '));
@@ -238,9 +239,11 @@
           t.setAttribute('points', attr.join(delim));
         }
 
-        t.classList[isClockwise && isAcute ? "add" : "remove"](className);
-        t.classList[isClockwise && !isAcute ? "add" : "remove"]("obtuse");
-        t.classList[!isClockwise ? "add" : "remove"]("anti-clockwise");
+        if (drawCollisionLines) {
+          t.classList[isClockwise && isAcute ? "add" : "remove"](className);
+          t.classList[isClockwise && !isAcute ? "add" : "remove"]("obtuse");
+          t.classList[!isClockwise ? "add" : "remove"]("anti-clockwise");
+        }
         if (isClockwise && isAcute) visible.push(t);
       });
 
@@ -397,7 +400,6 @@
       return position;
     }
 
-
     let start;
     let restart = false;
     function firstFrame(timestamp) {