Bob,

I am trying to read an OBJ file created by 3dt into the Jmol application. 
However I cannot get it to work. I get the following error message

$ load OBJ::FAU.obj
script ERROR: unrecognized file format type OBJ
----
         load >> "OBJ::FAU.obj" <<

The beginning of the file looks like this


mtllib FAU.mtl
o tile001
g kind002
v 0,323663 0,530359 0,071414
v -0,384936 0,217535 -0,473113
v -1,093535 0,530359 0,071414
v -1,093535 0,803098 -0,700011
v -0,384936 1,115922 -0,155485
v 0,323663 0,803098 -0,700011
v -0,384936 0,939468 -1,085724
v -0,384936 0,393989 0,457126
v 0,324652 0,103367 -0,078945
v 0,546008 0,234179 -0,443000
v 0,099338 0,400845 0,437734

What am I doing something wrong? I am using Jmol.jar of 14.2.4 of Aug 3, 2014

Thanks

Christian


On 24. Sep, 2014, at 10:49, Brian McMahon <b...@iucr.org> wrote:

> Hi Bob, Christian
> 
> This is a very timely discussion. I've recently returned from
> the first European Crystallography School in Pavia, where I
> talked with Davide Proserpio (davide.proser...@unimi.it) and
> Vladislav Blatov (bla...@samsu.ru) about this. I'll copy them
> into this message. Their program TOPOS
> (http://www.topos.samsu.ru/starting.html) is perhaps the most
> intensively maintained and developed such software at the moment.
> It could be helpful if Jmol were able to read and render output
> files from TOPOS.
> 
> However, Davide is also interested in using CIF as an existing
> standard exchange format. (Some of these tilings are generated
> by mathematical applications that are solely interested in
> topology, for which a very simple format is appropriate; but
> others do represent or model real crystal structures.) We
> figure that it would be helpful for Jmol to have a mode where
> it rendered only bonds in a CIF that had a specific flag set,
> something like
> 
>    loop_
>    _geom_bond_atom_site_label_1
>    _geom_bond_atom_site_label_2
>    _geom_bond_distance
>    _geom_bond_site_symmetry_1
>    _geom_bond_site_symmetry_2
>    _topos_geom_bond_publ_flag
>      X1  X2   1.342(4)  1_555  1_555  yes
>      X1  X2   1.439(3)  1_555  2_565  yes
>      X2  X3   1.512(4)  1_555  1_555  no
> 
> Perhaps we could follow this up off-list?
> 
> Best wishes
> Brian
> _________________________________________________________________________
> Brian McMahon                                       tel: +44 1244 342878
> Research and Development Officer                    fax: +44 1244 314888
> International Union of Crystallography            e-mail:  b...@iucr.org
> 5 Abbey Square, Chester CH1 2HU, England
> 
> On Tue, Sep 23, 2014 at 11:17:12AM +0200, Christian Baerlocher wrote:
>> Dear Bob,
>> 
>> You are of course quite right, there is no SiO2 molecule, because quartz and 
>> all its polymorphs are ?periodic nets?. You have to select a ?cluster? and 
>> to make it neutral you would have to add terminal OH groups.
>> 
>> This is a problem we face also in zeollite chemistry (many of them are 
>> polymorphs of SiO2) and a number of attempts had been made to define 
>> suitable clusters that describe a structure. So far the best approach for 
>> periodic nets seems to be that of "natural tilings?, defined and described 
>> by V. A. Blatov, O. Delgado-Friedrichs, M. O'Keeffe & D. M. Proserpio, Acta 
>> Crystallogr. A 63, 418-425 (2007). These natural tilings are further 
>> discussed by N. Anurova, V. A. Blatov, G. D. Ilyushin and D. M. Proserpio, 
>> J. Phys. Chem. C 114, 10160-10170 (2010).
>> 
>> You can see examples of such tilings on our zeolite website. For example, 
>> for the natural zeolite faujasite in
>> http://izasc.ethz.ch/fmi/xsl/IZA-SC/Tilings/FAU.pdf
>> 
>> Its framework of faujasite can be viewed with JSmol on 
>> http://izasc.ethz.ch/fmi/xsl/IZA-SC/ftc_3d_JSmol.php
>> 
>> These natural tilings have been done for all zeolites.
>> 
>> I am not sure, if this is what Hans Horn was looking for, but it would 
>> certainly be nice if Jmol could display such drawings ;-)
>> 
>> Thanks and best wishes
>> 
>> Christian
>> 
>> 
>> 
>> On 20 Sep 2014, at 04:24, Robert Hanson <hans...@stolaf.edu> wrote:
>> 
>>> Well, I think it is an interesting request. Help me define what the idea is 
>>> a bit more, and I can see what I can do. Given a few choice examples, how 
>>> would you define your request exactly?
>>> 
>>> For example, we have quartz (SiO2): 
>>> http://chemapps.stolaf.edu/jmol/simple2.htm?load%20jsmol/data/quartz.cif%20{1%201%201}
>>> 
>>> In this unit cell we have 
>>> 
>>> Si 1 + 4(1/2)  = 3 atoms
>>> O 6 atoms
>>> 
>>> But which three atoms would you choose to represent the model for "SiO2"? 
>>> Is it always possible to identify such a subset? Some cases probably 
>>> involve multiple options, and they are not equivalent. For example, in this 
>>> case, there is not a perfect tetrahedron around that Si atom. So picking 
>>> different O atoms would give different structures for the formula unit. 
>>> Which one would be the correct one to load? Sounds very challenging to me.
>>> 
>>> Bob
>>> ?
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>> 
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