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diff --git a/demos/webgl/HelloWorld_old.cpp b/demos/webgl/HelloWorld_old.cpp
deleted file mode 100644
index cacd128e..00000000
--- a/demos/webgl/HelloWorld_old.cpp
+++ /dev/null
@@ -1,142 +0,0 @@
-/*
-Bullet Continuous Collision Detection and Physics Library
-Copyright (c) 2003-2007 Erwin Coumans  http://continuousphysics.com/Bullet/
-
-This software is provided 'as-is', without any express or implied warranty.
-In no event will the authors be held liable for any damages arising from the use of this software.
-Permission is granted to anyone to use this software for any purpose, 
-including commercial applications, and to alter it and redistribute it freely, 
-subject to the following restrictions:
-
-1. The origin of this software must not be misrepresented; you must not claim that you wrote the original software. If you use this software in a product, an acknowledgment in the product documentation would be appreciated but is not required.
-2. Altered source versions must be plainly marked as such, and must not be misrepresented as being the original software.
-3. This notice may not be removed or altered from any source distribution.
-*/
-
-
-#include "btBulletDynamicsCommon.h"
-#include <stdio.h>
-
-/// This is a Hello World program for running a basic Bullet physics simulation
-
-  btDefaultCollisionConfiguration* zz_collisionConfiguration;
-  btCollisionDispatcher* zz_dispatcher;
-  btBroadphaseInterface* zz_overlappingPairCache;
-  btSequentialImpulseConstraintSolver* zz_solver;
-  btDiscreteDynamicsWorld* zz_dynamicsWorld;
-
-void zz_prepare()
-{
-
-  int i;
-
-  ///collision configuration contains default setup for memory, collision setup. Advanced users can create their own configuration.
-  zz_collisionConfiguration = new btDefaultCollisionConfiguration();
-
-  ///use the default collision zz_dispatcher. For parallel processing you can use a diffent zz_dispatcher (see Extras/BulletMultiThreaded)
-  zz_dispatcher = new  btCollisionDispatcher(zz_collisionConfiguration);
-
-  ///btDbvtBroadphase is a good general purpose broadphase. You can also try out btAxis3Sweep.
-  zz_overlappingPairCache = new btDbvtBroadphase();
-
-  ///the default constraint zz_solver. For parallel processing you can use a different zz_solver (see Extras/BulletMultiThreaded)
-  zz_solver = new btSequentialImpulseConstraintSolver;
-
-  zz_dynamicsWorld = new btDiscreteDynamicsWorld(zz_dispatcher,zz_overlappingPairCache,zz_solver,zz_collisionConfiguration);
-
-  zz_dynamicsWorld->setGravity(btVector3(0,-10,0));
-
-  ///create a few basic rigid bodies
-  btCollisionShape* groundShape = new btStaticPlaneShape(btVector3(btScalar(0.),btScalar(1.),btScalar(0.)), 0);
-
-  btTransform groundTransform;
-  groundTransform.setIdentity();
-  groundTransform.setOrigin(btVector3(0,-6,0));
-
-  {
-    btScalar mass(0.);
-
-    //rigidbody is dynamic if and only if mass is non zero, otherwise static
-    bool isDynamic = (mass != 0.f);
-
-    btVector3 localInertia(0,0,0);
-    if (isDynamic)
-      groundShape->calculateLocalInertia(mass,localInertia);
-
-    //using motionstate is recommended, it provides interpolation capabilities, and only synchronizes 'active' objects
-    btDefaultMotionState* myMotionState = new btDefaultMotionState(groundTransform);
-    btRigidBody::btRigidBodyConstructionInfo rbInfo(mass,myMotionState,groundShape,localInertia);
-    btRigidBody* body = new btRigidBody(rbInfo);
-
-    //add the body to the dynamics world
-    zz_dynamicsWorld->addRigidBody(body);
-  }
-
-
-  for (int i = 0; i < 5; i++)
-  {
-    //create a dynamic rigidbody
-
-    btCollisionShape* colShape = new btBoxShape(btVector3(1,1,1));
-    //btCollisionShape* colShape = new btSphereShape(btScalar(1.));
-
-    /// Create Dynamic Objects
-    btTransform startTransform;
-    startTransform.setIdentity();
-
-    btScalar  mass(1.f);
-
-    //rigidbody is dynamic if and only if mass is non zero, otherwise static
-    bool isDynamic = (mass != 0.f);
-
-    btVector3 localInertia(0,0,0);
-    if (isDynamic)
-      colShape->calculateLocalInertia(mass,localInertia);
-
-      startTransform.setOrigin(btVector3(0,4+i*2.1,0));
-    
-      //using motionstate is recommended, it provides interpolation capabilities, and only synchronizes 'active' objects
-      btDefaultMotionState* myMotionState = new btDefaultMotionState(startTransform);
-      btRigidBody::btRigidBodyConstructionInfo rbInfo(mass,myMotionState,colShape,localInertia);
-      btRigidBody* body = new btRigidBody(rbInfo);
-
-      zz_dynamicsWorld->addRigidBody(body);
-  }
-}
-
-
-/// Do some simulation
-
-
-void zz_simulate(float diff) {
-  zz_dynamicsWorld->stepSimulation(diff);
-}
-
-void zz_read(int j, btVector3& location, btQuaternion& rotation)
-{
-  {
-    btCollisionObject* obj = zz_dynamicsWorld->getCollisionObjectArray()[j];
-    btRigidBody* body = btRigidBody::upcast(obj);
-    if (body && body->getMotionState())
-    {
-      btTransform trans;
-      body->getMotionState()->getWorldTransform(trans);
-      location = trans.getOrigin();
-      rotation = trans.getRotation();
-      //printf("world pos = %.5f,%.5f,%.5f\n",float(location.getX()),float(location.getY()),float(location.getZ()));
-    }
-  }
-}
-
-int main(int argc, char** argv)
-{
-  zz_prepare();
-  zz_simulate(1/60.);//new btVector3);
-  btVector3 location;
-  btQuaternion rotation;
-  zz_read(1, location, rotation);
-  printf("world pos = %.5f,%.5f,%.5f   rot=%.5f,%.5f,%.5f,%.5f\n",float(location.getX()),float(location.getY()),float(location.getZ()),
-      float(rotation.getX()), float(rotation.getY()), float(rotation.getZ()), float(rotation.getW())
-    );
-}
-