fix stereo rendering in pview

panda/src/display/stereoDisplayRegion.cxx

@@ -33,6 +33,7 @@ StereoDisplayRegion(GraphicsOutput *window,
   nassertv(window == left->get_window() &&
            window == right->get_window());
   set_stereo_channel(Lens::SC_stereo);
+  set_sort(0);
 }
 
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