diff --git a/data/scripts/actors/actor_player.lua b/data/scripts/actors/actor_player.lua
index 612c089..662f111 100644
--- a/data/scripts/actors/actor_player.lua
+++ b/data/scripts/actors/actor_player.lua
@@ -67,23 +67,6 @@ function actor_player:action_update()
 	end
 end
 
--- TODO: remove
-function vec3_magnitude(_x, _y, _z)
-	return math.sqrt(_x * _x + _y * _y + _z * _z)
-end
-
-function vec3_normalize(_x, _y, _z)
-	local mag = vec3_magnitude(_x, _y, _z)
-	if mag == 0 then return 0, 0, 0 end
-	return _x / mag, _y / mag, _z / mag
-end
-
-function vec3_cross(_x1, _y1, _z1, _x2, _y2, _z2)
-	return 	_y1 * _z2 - _y2 * _z1, 
-			_z1 * _x2 - _z2 * _x1,
-			_x1 * _y2 - _x2 * _y1
-end
-
 function actor_player:update_player_movement(dt)
 	local movement = self:get_movement()
 	local speed = 4.0
diff --git a/data/scripts/game_init.lua b/data/scripts/game_init.lua
index 84c5e88..adfbd54 100644
--- a/data/scripts/game_init.lua
+++ b/data/scripts/game_init.lua
@@ -1,6 +1,7 @@
 -- Game initialization script
 
 -- загружаем скрипты
+load_script("mathlib.lua")
 load_script("game_utils.lua")
 load_script("game_hud.lua")
 load_script("game_object.lua")
diff --git a/data/scripts/mathlib.lua b/data/scripts/mathlib.lua
new file mode 100644
index 0000000..5166a78
--- /dev/null
+++ b/data/scripts/mathlib.lua
@@ -0,0 +1,17 @@
+-- math library
+
+function vec3_magnitude(_x, _y, _z)
+	return math.sqrt(_x * _x + _y * _y + _z * _z)
+end
+
+function vec3_normalize(_x, _y, _z)
+	local mag = vec3_magnitude(_x, _y, _z)
+	if mag == 0 then return 0, 0, 0 end
+	return _x / mag, _y / mag, _z / mag
+end
+
+function vec3_cross(_x1, _y1, _z1, _x2, _y2, _z2)
+	return 	_y1 * _z2 - _y2 * _z1, 
+			_z1 * _x2 - _z2 * _x1,
+			_x1 * _y2 - _x2 * _y1
+end
diff --git a/docs/lua help.txt b/docs/lua help.txt
index 3752117..9923bca 100644
--- a/docs/lua help.txt	
+++ b/docs/lua help.txt	
@@ -87,6 +87,7 @@ get_velocity()  -- return x, y, z
 has_rigid_body() -- return boolean
 create_box_body(float sizex, float sizey, float sizez, float mass, float friction, float damping, bool is_trigger, bool use_parameters)
 create_sphere_body(float radius, float mass, float friction, float damping, bool is_trigger, bool use_parameters)
+ForceBodyTransformUpdate() -- hack for forcing entity world transform to the rigid body
 
 
 find_animation(string name) -- find an animation in the model
diff --git a/src/game/game_object.cpp b/src/game/game_object.cpp
index 138b730..85a7375 100644
--- a/src/game/game_object.cpp
+++ b/src/game/game_object.cpp
@@ -222,6 +222,7 @@ void Entity::RegisterBaseFunctions()
 	m_luaObject.Register("has_rigid_body",  *this, &Entity::Lua_HasRigidBody);
 	m_luaObject.Register("create_box_body",  *this, &Entity::Lua_CreateBoxBody);
 	m_luaObject.Register("create_sphere_body",  *this, &Entity::Lua_CreateSphereBody);
+	m_luaObject.Register("ForceBodyTransformUpdate",  *this, &Entity::Lua_ForceBodyTransformUpdate);
 
 	// animation
 	m_luaObject.Register("find_animation", *this, &Entity::Lua_FindAnimation);
@@ -487,6 +488,13 @@ int Entity::Lua_CreateSphereBody(LuaPlus::LuaState* state)
 	return 0;
 }
 
+int Entity::Lua_ForceBodyTransformUpdate(LuaPlus::LuaState* state)
+{
+	ForceUpdateBodyTranslation();
+
+	return 0;
+}
+
 int Entity::Lua_FindAnimation(LuaPlus::LuaState* state)
 {
 	LuaPlus::LuaStack stack(state);
@@ -692,6 +700,18 @@ void Entity::UpdateBodyDirty()
 	}
 }
 
+void Entity::ForceUpdateBodyTranslation()
+{
+	if (!m_rigidBody)
+		return;
+
+	// I'm sure that position is valid
+	btTransform xform;
+	xform.setIdentity();
+	xform.setOrigin(glmVectorToBt(m_position));
+	m_rigidBody->setWorldTransform(xform);
+}
+
 REGISTER_ENTITY(WeaponBase);
 
 WeaponBase::WeaponBase()
diff --git a/src/game/game_object.h b/src/game/game_object.h
index 6998c8e..99229cb 100644
--- a/src/game/game_object.h
+++ b/src/game/game_object.h
@@ -91,6 +91,7 @@ public:
 
 	void UpdateBody();
 	void UpdateBodyDirty();
+	void ForceUpdateBodyTranslation();
 
 	// Game entity lua bindings
 
@@ -125,6 +126,7 @@ public:
 	int Lua_HasRigidBody(LuaPlus::LuaState* state);
 	int Lua_CreateBoxBody(LuaPlus::LuaState* state);
 	int Lua_CreateSphereBody(LuaPlus::LuaState* state);
+	int Lua_ForceBodyTransformUpdate(LuaPlus::LuaState* state);
 
 	int Lua_FindAnimation(LuaPlus::LuaState* state);
 	int Lua_PlayAnimation(LuaPlus::LuaState* state);