Handler3D: Slightly more robust coord system detection.

stevenlovegrove · Nov 22, 2016 · 4883643 · 4883643
1 parent 5eae415
commit 4883643
Showing 1 changed file with 6 additions and 4 deletions.
diff --git a/src/handler/handler.cpp b/src/handler/handler.cpp
@@ -278,11 +278,13 @@ void Handler3D::MouseMotion(View& display, int x, int y, int button_state)
             rotation_changed = true;
         }else if( button_state == MouseButtonRight)
         {
-            // Try to correct for different coordinate conventions.
             GLprecision aboutx = -rf * delta[1];
-            GLprecision abouty =  rf * delta[0];
-            OpenGlMatrix& pm = cam_state->GetProjectionMatrix();
-            abouty *= -pm.m[2*4+3];
+            GLprecision abouty = -rf * delta[0];
+
+            // Try to correct for different coordinate conventions.
+            if(cam_state->GetProjectionMatrix().m[2*4+3] <= 0) {
+                abouty *= -1;
+            }
 
             if(enforce_up) {
                 // Special case if view direction is parallel to up vector