> OK, I'll start a user thread on that to get ideas of needs. My feeling
> is that it all has to be done at file load time,
> unless you want to implement some sort of atom addition/removal
> mechanism. (I'm guessing you do NOT want to do that!)

I think that we probably could handle adding atoms.

removing them would be a disaster.

One way that I thought of handling it was to take a unit cell and grow it
into a crystal by creating a new model on the fly. I think that we could
handle that.

> The basic idea
> would be - indicate at file load all the cells you want; later you can
> display or not.

Yes, I think that the mechanism is to control display of the atoms ...
even if they are already there.

> One thing that comes to mind is a new sort of
> "connected()" selection option -- something like "chain" but for general
> molecules -- that would select all atoms "in the same molecule" as some
> particular atom set.
> But I don't know how to pass information to a file reader that specifies
> HOW to read the file (and generate the multiple unit cells). One might
> naively say "do that later" but the maleic.cif file shows that to be
> impossible -- all atoms must be in place prior to the next model
> reading, so the application of multiple unit cells must be PRIOR to
> action in Frame. At least that is what I conclude.

I did not understand much of this. Please try to clarify for me.


Miguel



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