I'm using PyQtGraph to plot mesh surfaces. I would like to see the 3D world with perspective turned off. 
Is this possible in pyQtGraph? I have searched through the documentation and the google groups and can't find any reference to this. I think it is possible in principle with openGL so is there a way to bring this out and control perspective on/off in pyQtGraph?
I would recommend trying out the newer vispy; it is much more flexible with regards to the types of cameras and mouse interactions supported. In particular, orthographic projection happens to be the default for the 'arcball' camera type, and probably the others too; it's set by setting camera.fov to be 0.
As a bonus, ergonomics with ipython are also much improved, i.e. your ipython shell stays responsive at the same time the scene is active, and you can kill the scene without killing your ipython instance, and launch another.
PyQtGraph - Turn off perspective in 3d view