diff --git a/ag.cc b/ag.cc
index 45b2d56..ecd0e38 100644
--- a/ag.cc
+++ b/ag.cc
@@ -115,6 +115,8 @@ namespace ag
         lua_setfield(L, -2, "clone");
         lua_pushcfunction(L, object::destroy);
         lua_setfield(L, -2, "destroy");
+        lua_pushcfunction(L, object::setVisible);
+        lua_setfield(L, -2, "setVisible");
     }
 
     static int loadModelSpecify(lua_State * L, bool static_data)
@@ -347,5 +349,19 @@ namespace ag
             }
             return 0;
         }
+
+        int setVisible(lua_State * L)
+        {
+            int argc = lua_gettop(L);
+            if (argc == 2)
+            {
+                Engine::Object * obj = getObject(L, 1);
+                if (obj != NULL && lua_isboolean(L, 2))
+                {
+                    obj->setVisible(lua_toboolean(L, 2));
+                }
+            }
+            return 0;
+        }
     }
 }
diff --git a/ag.h b/ag.h
index 6c6fac5..add00f4 100644
--- a/ag.h
+++ b/ag.h
@@ -26,6 +26,7 @@ namespace ag
         int getPosition(lua_State * L);
         int clone(lua_State * L);
         int destroy(lua_State * L);
+        int setVisible(lua_State * L);
     }
 }
 
diff --git a/anaglym.cc b/anaglym.cc
index d5ed4d0..2449803 100644
--- a/anaglym.cc
+++ b/anaglym.cc
@@ -355,10 +355,12 @@ Engine::Object::Object(bool is_static, OdeWorld & world, GLuint dl)
     m_display_list = dl;
     m_display_list_refcnt = new int;
     *m_display_list_refcnt = 1;
+    m_is_visible = true;
 }
 
 Engine::Object::Object(const Engine::Object & orig)
 {
+    m_is_visible = orig.m_is_visible;
     m_ode_object = new OdeWorld::Object(*orig.m_ode_object);
     m_display_list = orig.m_display_list;
     m_display_list_refcnt = orig.m_display_list_refcnt;
@@ -379,15 +381,18 @@ Engine::Object::~Object()
 
 void Engine::Object::draw()
 {
-    const dReal * pos = m_ode_object->getPosition();
-    const dReal * rot = m_ode_object->getRotation();
-    bool transform = (pos != NULL && rot != NULL);
+    if (m_is_visible)
+    {
+        const dReal * pos = m_ode_object->getPosition();
+        const dReal * rot = m_ode_object->getRotation();
+        bool transform = (pos != NULL && rot != NULL);
 
-    if (transform)
-        OdeWorld::pushTransform(pos, rot);
+        if (transform)
+            OdeWorld::pushTransform(pos, rot);
 
-    glCallList(m_display_list);
+        glCallList(m_display_list);
 
-    if (transform)
-        glPopMatrix();
+        if (transform)
+            glPopMatrix();
+    }
 }
diff --git a/anaglym.h b/anaglym.h
index 2cc12ec..ceb821c 100644
--- a/anaglym.h
+++ b/anaglym.h
@@ -33,6 +33,8 @@ class Engine
                 {
                     m_ode_object->loadPhy(path);
                 }
+                void setVisible(bool visible) { m_is_visible = visible; }
+                bool getVisible() { return m_is_visible; }
 
                 void draw();
 
@@ -40,6 +42,7 @@ class Engine
                 OdeWorld::Object * m_ode_object;
                 GLuint m_display_list;
                 int * m_display_list_refcnt;
+                bool m_is_visible;
         };
 
         Engine();
diff --git a/tests/ballstairs.lua b/tests/ballstairs.lua
index 087fb55..9ce4537 100755
--- a/tests/ballstairs.lua
+++ b/tests/ballstairs.lua
@@ -1,10 +1,5 @@
 
 function update()
-    elapsed = ag.elapsedTime()
-    if (elapsed > 2000 and ball2there) then
-        ball2:destroy()
-        ball2there = false
-    end
     ballx, bally, ballz = ball:getPosition()
     ag.setCamera(7, -6, 15, ballx, bally, ballz, 0, 0, 1)
     ag.doPhysics()
@@ -15,11 +10,11 @@ end
 
 --ag.setCamera(8, -8, 15, -8, 8, 4, 0, 0, 1)
 arena = ag.loadStaticModel("boxarena")
+arena:setVisible(false)
 ball = ag.loadModel("ball")
 ball:setPosition(-7, 7.4, 12)
 ball2 = ball:clone()
 ball2:setPosition(-7, 7.4, 14)
-ball2there = true
 ball3 = ball:clone()
 ball3:setPosition(-7, 7.4, 16)
 logo = ag.loadModel("dwlogo")