Interesting, Bob

This suggests me some promising possibilities. Could your 
implementation be used for them, probably using some scripting?

a) Moving a subset of the model. For example, moving a ligand out of 
its binding site, to coarsely simulate the unbound or approaching 
states. Or just a better display of a file containing several 
separate molecules (for ex, I could combine 4 nitrogen bases in a 
file like in 4-panel display as far as they are aligned to be seen 
from a similar perspective; the starting 4 files will likely have 
different coordinate systems, but the dragging allows nme to put them 
side by side)

b)  Model superimposition/alignment. 
For instance, DeepView does alignment from 2 loaded pdb files, when 
you choose in both models the atoms that will be used for 
superimposition. Each of the 2 models is then translated and rotated 
around  as a whole until those atoms positions match, The new 
coordinates can be saved, for both models separate or together in a 
single file. This allows for displaying two-state animations, like 
hemoglobin oxi-deoxi transition.

It would be important that after manipulation the new coordinates can 
be saved to disk.

Separate:
If I remember correctly, after "set picking draw" ALT_LEFT is already 
translating the objects. So, do you plan to have ALT_SHIFT_LEFT doing 
the same, or am I missing some difference?


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