Merged.

src/modules/physics/box2d/Body.cpp

@@ -118,7 +118,7 @@ namespace box2d
 
 	void Body::applyImpulse(float jx, float jy)
 	{
-		body->ApplyImpulse(b2Vec2(jx, jy), world->scaleDown(body->GetWorldCenter()));
+		body->ApplyImpulse(b2Vec2(jx, jy), body->GetWorldCenter());
 	}
 
 	void Body::applyImpulse(float jx, float jy, float rx, float ry)
@@ -138,7 +138,7 @@ namespace box2d
 
 	void Body::applyForce(float fx, float fy)
 	{
-		body->ApplyForce(b2Vec2(fx, fy), world->scaleDown(body->GetWorldCenter()));
+		body->ApplyForce(b2Vec2(fx, fy), body->GetWorldCenter());
 	}
 
 	void Body::setX(float x)

src/modules/physics/box2d/wrap_Body.cpp

@@ -140,9 +140,22 @@ namespace box2d
 		Body * t = luax_checkbody(L, 1);
 		float jx = (float)luaL_checknumber(L, 2);
 		float jy = (float)luaL_checknumber(L, 3);
-		float rx = (float)luaL_optnumber(L, 4, 0);
-		float ry = (float)luaL_optnumber(L, 5, 0);
-		t->applyImpulse(jx, jy, rx, ry);
+
+		if(lua_gettop(L) == 3)
+		{
+			t->applyImpulse(jx, jy);
+		}
+		else if(lua_gettop(L) == 5)
+		{
+			float rx = (float)luaL_checknumber(L, 4);
+			float ry = (float)luaL_checknumber(L, 5);
+			t->applyImpulse(jx, jy, rx, ry);
+		}
+		else
+		{
+			return luaL_error(L, "Wrong number of parameters.");
+		}
+		
 		return 0;
 	}
 
@@ -159,9 +172,23 @@ namespace box2d
 		Body * t = luax_checkbody(L, 1);
 		float fx = (float)luaL_checknumber(L, 2);
 		float fy = (float)luaL_checknumber(L, 3);
-		float rx = (float)luaL_optnumber(L, 4, 0);
-		float ry = (float)luaL_optnumber(L, 5, 0);
-		t->applyForce(fx, fy, rx, ry);
+
+
+		if(lua_gettop(L) == 3)
+		{
+			t->applyForce(fx, fy);
+		}
+		else if(lua_gettop(L) == 5)
+		{
+			float rx = (float)luaL_checknumber(L, 4);
+			float ry = (float)luaL_checknumber(L, 5);
+			t->applyForce(fx, fy, rx, ry);
+		}
+		else
+		{
+			return luaL_error(L, "Wrong number of parameters.");
+		}
+		
 		return 0;
 	}