Switching between perspective and orthogonal view for GUIVisualizer or SceneWidget+Camera

[hduonggithub]

Is there anyone know how to switch from perspective to orthogonal view (vice versa) keeping the same view size of model and zooming within GUIVisualizer or Scenewidget (vis_gui.py).

I read help/documentation a lot but still cannot figure out how to get it works. I wish I could have a example code/ hints how to do it.

Help please ! Thanks

[germanros1987]

Please, check this discussion: #3660