VMD-L Mailing List

From: Ajasja Ljubetič (ajasja.ljubetic_at_gmail.com)
Date: Sat Jan 29 2011 - 06:42:06 CST

Thank you all for your help. For now I'll go with the volmap plugin and a
transparent surface representation.

Best regards,
Ajasja

On Fri, Jan 28, 2011 at 17:14, John Stone <johns_at_ks.uiuc.edu> wrote:

>
> Hi,
> In addition to what Axel suggested, my latest versions of Tachyon
> add a new flag that lets you limit the number of transparent surfaces
> it renders, to get an effect more like what you saw in VMD's OpenGL/GLSL
> renderings:
> -trans_max_surfaces XX
>
> Try some number between 1 and 5 for your case, that ought to work
> reasonably well.
>
> If you want to try this, I've posted the latest test version of Tachyon
> in the VMD alpha test directory, as described here:
> http://www.ks.uiuc.edu/Research/vmd/alpha/
>
> Cheers,
> John Stone
> vmd_at_ks.uiuc.edu
>
> On Fri, Jan 28, 2011 at 10:56:06AM -0500, Axel Kohlmeyer wrote:
> > 2011/1/28 Ajasja Ljubeti? <ajasja.ljubetic_at_gmail.com>:
> > > Dear All,
> > > I'm still having trouble rendering highly transparent (alpha is set to
> > > 0.02) spheres in Tachyon or pov-ray.
> > > This is a screen shot, tachyon gives this, pov-ray gives this.
> > > I'm happy with the screenshot, but I would need a higher resolution for
> > > printing.
> >
> > ajasja,
> >
> > transparency is a situation where raytracing will
> > give you different results than GLSL due to the
> > approximations done in OpenGL rendering.
> >
> > for that kind of visualization you are better off using
> > a Surf representation for the transparent part and
> > then use one of the materials with angle dependent
> > transparency (BlownGlass or GlassBubble). check out:
> >
> http://picasaweb.google.com/lh/photo/-1WEt4u41zSNcZr5nV-cCQ?feat=directlink
> > as an example.
> >
> > cheers,
> > axel.
> >
> > > Best regards,
> > > Ajasja
> > >
> > > 2010/12/8 Ajasja Ljubeti? <ajasja.ljubetic_at_gmail.com>
> > >>
> > >> Dear all,
> > >> I'm having some trouble rendering a scene with multiple transparent
> > >> spheres. In VMD the scene is fine, but using Tachyon the transparency
> is
> > >> different.
> > >> Since a picture is worth a thousand words i'm also attaching one:)
> > >> I also put the trouble.dat online.
> > >> Best regards,
> > >> Ajasja Ljubeti?,
> > >> Young researcher,
> > >> Department of solid state physics,
> > >> Institute Jo?ef ?tefan,
> > >> Ljubljana Slovenia
> > >
> > >
> >
> >
> >
> > --
> > Dr. Axel Kohlmeyer
> > akohlmey_at_gmail.com http://goo.gl/1wk0
> >
> > Institute for Computational Molecular Science
> > Temple University, Philadelphia PA, USA.
>
> --
> NIH Resource for Macromolecular Modeling and Bioinformatics
> Beckman Institute for Advanced Science and Technology
> University of Illinois, 405 N. Mathews Ave, Urbana, IL 61801
> Email: johns_at_ks.uiuc.edu Phone: 217-244-3349
> WWW: http://www.ks.uiuc.edu/~johns/ Fax: 217-244-6078
>