In the latest design puzzle, I've been trying to move part of the protein along a
certain axis. To monitor this motion, it would help to have the display split in two,
with each half of the display showing the protein from a different point of view.
For my case, having one view along the axis and another view perpendicular to this
same axis would be helpful. Having these different views update simultaneously as
the protein changes shape would also be helpful.
In drafting, one often shows the same object from three different directions all
perpendicular to each other. It would be nice if Foldit could do this too.
https://www.pinterest.com/pin/715227984542285720/ gives many examples while
https://rharmon.files.wordpress.com/2012/10/design-process-orthographic-views.jpg gives:

A related idea would be to have hotkeys (like the arrow keys on the keyboard)
that would rotate the protein about the x or y axes by 90 degrees.
If left-right on the display is the x axis and up-down is the y axis,
one could use the <- and -> arrows to rotate 90 degrees about the y axis,
and one could use the up and down arrows to rotate 90 degrees about the x axis.
Also, if the z axis is in & out of the display, one could use the page-up
& page-down keys to rotate the protein 90 degrees about the z axis
(this would be like rotating the display clockwise or counterclockwise).
The simpler the hotkeys, the more quickly we can switch the protein view.
Restating the above, if the view
began with the front of the protein,
pressing the right-arrow (->) key repeatedly
would change the view from front to right-side
to back to left-side to front.
Pressing the left-arrow (<-) key repeatedly
would change the view from front to left-side
to back to right-side to front.
Pressing the up-arrow key repeatedly
would change the view from front to top
to back (upside-down) to bottom to front.
Pressing the down-arrow key repeatedly
would change the view from front to bottom
to back (upside-down) to top to front.
Pressing the Page-Up key would rotate
the front view of the protein 90 degrees
clockwise.
Pressing the Page-Down key would rotate
the front view of the protein 90 degrees
counterclockwise.
I love this hotkey idea for 90 degree rotation in 3 dimensions. Currently, one can drag to rotate, but you're only guessing how far you've turned, and there is no way then to rotate back to exactly the previous viewpoint. Quick and easy 90 degree rotations would fix that.
This is a cool idea! I could imagine complications from splitting the screen that would require some serious code changes; but I think a hotkey for 90 degree rotations would be much more feasible.
I suppose you could have a slider in addition to the hotkeys.
The slider would adjust how big the angle increments should be.
The default value could be 90 degrees, but folks might want
to do smaller angle increments like 30 or 45 degrees instead.
More generic: split display in order to view something else in a smaller window.
This would be very useful for ED puzzle:
-shift-Q on the main window
-q on the smaller one (in order to keep the global view)
I can imagine a lot of other applications, selecting a view for the main window and another view settings for the second one.
For my self I could see it helpful in regard of having about 10 degrees difference preferably having the option of putting the selected angle in the window you want so I would set it to see 3D Cross Viewing of the protein but still I would be able to look at it even if they would be placed non crossing viewing but for my self it be easier then imaging to look thru the screen as if it was a clear window, while crossing is easier to think of a fly is coming wright at your nose from the screen and your reflex trying to look at it and suddenly seeing the 3D combine angles. I already did a few double picture of the fold it screen and quiet a beautiful 3D experience to see.
here is an example cross viewing, just concentrate on the black dot until you combine dots together and "voila". enjoy. I like to torture your eyes muscles. :-)
If you were able to see the previous 3D here is another one to really refine your skill.
I know for myself I even be able to work 3D on split screens, there is a few cartoons on the net of a roller coaster ride twin films aside, that I was able to look at it all the way, but sometimes in a curve I will admit that I lost the 3D.
For me size doesn't matter even those example on a 28" screen, but to start you should try a smaller size.