account for Helix Group rotation properly in oxdna/oxview export

[dave-doty]

This scadnano design:

Does not export as expected to oxView:

complex.zip

The three short (length 7) helices 2,3,4 should be between the two longer helices 0 and 1, since they are grid coordinates (0,0), (0,1), and (0,2). Instead, helices 2,3,4 go in the positive y-direction instead of the negative z-direction.

But, I could simply be thinking about this improperly. I assumed if I set the rotation of the helix group containing helices 2,3,4 to 90, then grid coordinates (0,0), (0,1), (0,2), which move in the positive y-direction normally, after rotating should now move in the negative x direction. I could be thinking about this improperly. But the intention was always that any design that can be rendered in the scadnano 2D main view should look similar in a 3D export since adjusting only pitch (which rotates in the y-z plane of the main view) and y-z position (which translates only within the y-z plane) should preserve the geometric depiction of the design in both.