Make the Fragment effects truly 3D: change their 4D 'region' into a 3D 'center' (a point in 3D) and 3D 'region' (which is now a set of 3 radii defining an ellipsoid around the center)
Also corresponding changes to the applications.
Progress with Effects3D app - merge Matrix effects
Progress with Effects3D app.
Effects3D app: remove debugs.
More progress with Effects3D app.
Make the 2nd Effects3D activity be an AppCompat one (for Fragments - avoid using a depreciated FragmentPagerAdapter).
Split the Effects3D app into 2 activities
Some progress with Effects3D app
Overhaul of the Effects3D generic test app.
Still not perfect (the 'postprocess' tab does not work; things crash when we rotate)