diff --git a/.todo b/.todo
index a89f511..aa4e6fa 100644
--- a/.todo
+++ b/.todo
@@ -1,4 +1,3 @@
 add audio capabilities
 add fillCircle()
 add gradient functionality
-reconcile mouse coordinates & 2D coordinates
diff --git a/Engine.cc b/Engine.cc
index 74abb67..27e4996 100644
--- a/Engine.cc
+++ b/Engine.cc
@@ -670,7 +670,7 @@ refptr< vector<int> > Engine::pickObjects(int x, int y)
             forward[0], forward[1], forward[2]);
     initial_direction[0] = x - m_av.getWidth() / 2;
     initial_direction[1] = m_screen_dist;
-    initial_direction[2] = m_av.getHeight() / 2 - y;
+    initial_direction[2] = y - m_av.getHeight() / 2;
     dMultiply0(rotated_direction, r, initial_direction, 3, 3, 1);
     normalize(rotated_direction);
 
@@ -1040,7 +1040,7 @@ void Engine::mousebutton_down_event(int button, int x, int y)
                 EVENT_HANDLER_AG_NAME(mousebutton_down));
         lua_pushinteger(m_luaState, button);
         lua_pushnumber(m_luaState, x);
-        lua_pushnumber(m_luaState, y);
+        lua_pushnumber(m_luaState, m_av.getHeight() - y);
         /* call the mouse button down event function
          * This pops the function ref and arguments from the stack */
         int s = lua_pcall(m_luaState, 3, 0, 0);
@@ -1056,7 +1056,7 @@ void Engine::mousebutton_up_event(int button, int x, int y)
                 EVENT_HANDLER_AG_NAME(mousebutton_up));
         lua_pushinteger(m_luaState, button);
         lua_pushnumber(m_luaState, x);
-        lua_pushnumber(m_luaState, y);
+        lua_pushnumber(m_luaState, m_av.getHeight() - y);
         /* call the mouse button up event function
          * This pops the function ref and arguments from the stack */
         int s = lua_pcall(m_luaState, 3, 0, 0);
@@ -1071,9 +1071,9 @@ void Engine::mouse_motion_event(int x, int y, int xrel, int yrel)
         lua_getfield(m_luaState, LUA_GLOBALSINDEX,
                 EVENT_HANDLER_AG_NAME(mouse_motion));
         lua_pushnumber(m_luaState, x);
-        lua_pushnumber(m_luaState, y);
+        lua_pushnumber(m_luaState, m_av.getHeight() - y);
         lua_pushnumber(m_luaState, xrel);
-        lua_pushnumber(m_luaState, yrel);
+        lua_pushnumber(m_luaState, -yrel);
         /* call the mouse motion event function
          * This pops the function ref and arguments from the stack */
         int s = lua_pcall(m_luaState, 4, 0, 0);