Bob wrote:
>>  - What happens to the scaling factor?
>
> I would presume spacefills and bonds don't change size. But I don't know
> if that's an easy or difficult request.
>
>
>>  - Do things get moved off the screen?
>
> If the zoom isn't set as well, sure.
>
>>  - What becomes the new center of rotation?
>
> Stays "based on the same set of atoms" unless the "center" command is
> given as well.
>
>>  - What happens to the 'camera' for perspective depth calculations?
>>
>
> Again, no change in conditions for this -- recalculation necessary,
> presumably.

This is a big part of the problem.

The scene is the sphere which encapsulates the outermost point of all the
objects that are drawn.

The camera must be outside of the scene.

If the scene gets bigger the camera must be 'backed up'. As an example,
there are currently bugs when the 'unit cell cage' is turned on. When you
rotate you can see messages to the java console saying 'back up the
camera' and you can see that the scene gets smaller as you rotate the
scene.

When the camera backs up, things get smaller. One can try to compensate by
using the zoom lens, but the result is not the same.

These issues would be much less important if we did not use perspective
depth.


Miguel



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