diff --git a/src/game-lib-world.js b/src/game-lib-world.js
index 76eb306..07896d8 100644
--- a/src/game-lib-world.js
+++ b/src/game-lib-world.js
@@ -109,24 +109,18 @@ GameLib.D3.World.prototype.step = function(
     this.instance.step(fixedStep, dtStep, 3);
     return;
 
-
-    // todo: figure out, why this call to internal step is more stable for trimesh collisions.....
-    //this.instance.internalStep(timeStep);
-    //return;
-    //console.log("this should not be called.");
-
-    //var now = Date.now() / 1000;
-    var now = null;
+    var now = Date.now() / 1000.0;
+    //var now = null;
     if(!this.lastCallTime){
         // last call time not saved, cant guess elapsed time. Take a simple step.
-        this.instance.step(timeStep);
+        this.instance.step(fixedStep);
         this.lastCallTime = now;
         return;
     }
 
-    var timeSinceLastCall = now - this.lastCallTime;
+    var timeSinceLastCall = (now - this.lastCallTime);
 
-    this.instance.step(timeStep, timeSinceLastCall);
+    this.instance.step(fixedStep, timeSinceLastCall, 4);
 
     this.lastCallTime = now;
 };