You are welcome -- there's more to do, but I do think it is much better
cleaned up this way. Thanks for suggesting that.
On Fri, Jul 17, 2009 at 11:46 AM, Ralf Stephan <[email protected]>wrote:
> Many thanks for that great work, Bob!
>
>
> ralf
>
> On Jul 17, 2009, at 4:53 PM, Robert Hanson wrote:
>
> > OK, one last fix -- I removed all XY clipping for VRML and MAYA. The
> > way it was, if an object was fully outside the screen area, it was
> > being clipped. But of course this has no meaning in a VRML or MAYA
> > export context. So the trick right now is to zoom in on the
> > structure, do the rendering, and zoom out. We could think about
> > making that automatic. Right now you have to do it yourself.
> >
> > I'm really glad Ralf brought this up. The VRML is starting to look
> > very good, I think. I just added caching for fonts and labels.
> > Realize that labels are an approximation only.
> >
> > Bob
> >
> >
> > On Fri, Jul 17, 2009 at 8:29 AM, Robert Hanson <[email protected]>
> > wrote:
> > Angel, I've uploaded a pretty succinct VRML exporter. It was simpler
> > than I thought -- only requiring one Hashtable for all objects. Not
> > exactly human readable anymore, but that's not the point, right?
> > Take a look. We now have DEF/USE for appearance, sphere, and
> > cylinder. I also added fillTriangle, which instantly adds quite a
> > bit of capability.
> >
> > Ah, now, the rub. The exporters are of two types. POV-RAY outputs a
> > scene in the perspective coordinates of the screen. This is to
> > ensure an identical output. VRML/MAYA output regular Cartesian
> > coordinates, without regard to perspective. HOWEVER, in order to do
> > that, they have to untransform screen points, and that is a possible
> > issue. Basically the "resolution" of the VRML output is dependent
> > upon the user's screen resolution. I admit that's a design flaw. I
> > notice it with traces, but that's all. So maybe there's a simple fix
> > there, and we will have no problem. But it is something I'm trying
> > to figure out. This is about all the time I have for this now -- I
> > hope I've given you a good head start with it. Thnik about
> > perspective. Jmol uses a 4x4 translation/rotation matrix that can be
> > obtained using viewer.getUnscaledTransformationMatrix(), which might
> > work for these purposes.
> >
> >
> > Bob
> >
> >
> >
> > 2009/7/17 Angel Herráez <[email protected]>
> > I found some interesting software: Chisel, a VRML optimizer.
> >
> > It's free (PD) and written in Java. One could run any files through
> > it to have them reduced. Of course, if Jmol can do it straight away,
> > it's better.
> > Description of the optimization methods matches what we have been
> > discussing about DEF / USE.
> > I've collated links and brief info into the Jmol Wiki > File formats
> > > 3D Objects > VRML
> >
> > This has also brougth another idea: to gzip the vrml file. Some
> > viewers do not recognize the recommended extension, .vrz, but do read
> > the file if it is gzipped but has wrl extension. Embedding wrz files
> > into web pages seems to work fine.
> > So, Bob, maybe the export dialog could offer a double option?
> > .wrl (plain VRML v2) or .wrz (gzipped VRML v2)
> >
> > I am guessing that Jmol has the gzip algorithm embedded already, does
> > it not?
> >
> > And I think we should change the current default extension of vrml to
> > be wrl which seems to be more widely supported.
> >
> >
> >
> >
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> >
> >
> > --
> > Robert M. Hanson
> > Professor of Chemistry
> > St. Olaf College
> > 1520 St. Olaf Ave.
> > Northfield, MN 55057
> > http://www.stolaf.edu/people/hansonr
> > phone: 507-786-3107
> >
> >
> > If nature does not answer first what we want,
> > it is better to take what answer we get.
> >
> > -- Josiah Willard Gibbs, Lecture XXX, Monday, February 5, 1900
> >
> >
> >
> > --
> > Robert M. Hanson
> > Professor of Chemistry
> > St. Olaf College
> > 1520 St. Olaf Ave.
> > Northfield, MN 55057
> > http://www.stolaf.edu/people/hansonr
> > phone: 507-786-3107
> >
> >
> > If nature does not answer first what we want,
> > it is better to take what answer we get.
> >
> > -- Josiah Willard Gibbs, Lecture XXX, Monday, February 5, 1900
> >
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>
> Ralf Stephan
> http://www.ark.in-berlin.de
> pub 1024D/C5114CB2 2009-06-07 [expires: 2011-06-06]
> Key fingerprint = 76AE 0D21 C06C CBF9 24F8 7835 1809 DE97 C511
> 4CB2
>
>
>
>
>
>
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--
Robert M. Hanson
Professor of Chemistry
St. Olaf College
1520 St. Olaf Ave.
Northfield, MN 55057
http://www.stolaf.edu/people/hansonr
phone: 507-786-3107
If nature does not answer first what we want,
it is better to take what answer we get.
-- Josiah Willard Gibbs, Lecture XXX, Monday, February 5, 1900
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