"Bald Eagle" <cre### [at] netscapenet> wrote:
> Thomas de Groot <tho### [at] degrootorg> wrote:
>
> > > Aren't the HKL values just the vector normals of the planes?
> > > That's what the wikipedia articles suggested on my brief skim.
> > >
> > > Would not plane {y, 0} have an hkl index of <0,1,0>?
> > >
> > > Not sure what the overall goal is, so not sure what to suggest to test this.
> > >
> > If I remember correctly, that is indeed the case I believe.
> >
> > --
> > Thomas
>
> So then, to some degree, the unit cell for the crystal should be some form of
> intersection between all of the planes that the hkl indices define. (?)

I think the unit cell defines the dimensions and angles. Attached is a
screenshot from KrystalShaper. The thin-lined, skewed box surrounding the
crystal represents the unit cell. In the lower right area of the image you can
see the numbers "4.913 x 4.913 x 5.4045" which are probably the dimensions of
the cell. The numbers "90 90 120" are the angles. But how to convert these to
proper planes? All my attempts have failed. There is probably a basic solution
and I'm just over-complicating things...

> Does the file format include any data that would serve as an offset?

The data files are in some non-human-readable format. I should probably get a
hex editor and take a look.

> Creating the most basic crystal shapes, probably starting with cubic NaCl, might
> give a clue as to how to code an implementation of that notational system.

Yes, I should start with the most basic thing first.

Sam

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