VMD-L Mailing List

From: Luis M. Sánchez (lmsp_at_uniovi.es)
Date: Fri May 04 2012 - 09:45:34 CDT

You are right, the anaglyph variants that I suggested are not worth the
effort.

Magenta-cyan anaglyphs are harder to implement than I previously stated,
because the blue channel has to be blurred before sending it to each frame.

I tested two LCD screens, two green-magenta glasses, and three red-cyan
glasses. The green-magenta anaglyphs had better CPK colors than red-cyan
ones, but this advantage was more than offset by their higher crosstalk.

Best regards

On Mon, 23 Apr 2012 22:49:37 +0200, John Stone <johns_at_ks.uiuc.edu> wrote:

> Luis,
> Before we look deeply at implementing the other forms of anaglyph,
> why not try them out yourself? It should be relatively easy to try
> them out by rendering two full-color images in VMD, followed by filtering
> them with the NetPBM tools or one of the dedicated stereo image
> manipulation
> tools like SDM (stereo data maker). To render the image pair in VMD,
> just
> select the "Left" and "Right" images, and use the File|Render|Snapshot
> menu item to generate a snapshot for both the left and right eyes.
> Once you have the stereo image pair, you should be able to try out the
> various
> anaglyph modes in SDM and see if you think they are actually better than
> the default anaglyph implementation currently provided by VMD.
> StereoDataMaker is available here:
> http://stereo.jpn.org/eng/sdm/index.htm
> Here's a basic guide on making anaglyph images using NetPBM:
> http://netpbm.sourceforge.net/doc/ppm3d.html
>
> I think that it's worth trying out the other anaglyph formats yourself
> to determine if you still think it would be worthwhile to add them to
> VMD.
> I have looked at some of them before, but I never found the other
> variants
> to be much of an improvement over the normal red/cyan approach, but I am
> certainly willing to consider it other people think it would be a big
> improvement.
>
> Cheers,
> John Stone
> vmd_at_ks.uiuc.edu
>
>
>
> On Sat, Apr 21, 2012 at 11:56:32PM +0200, Luis M. Sánchez wrote:
>> Hi,
>> Anaglyph stereo is a poor thing. However, it is the main option in
>> commodity hardware, which has replaced most workstations. For example, I
>> would like to provide out-of-budget stereoscopic vision gadgets for a
>> dozen computers that will be used in some short structural biology
>> courses. I am planning to test a pair of prism glasses for cross-eyed
>> stereo. Maybe they will work better than anaglyph glasses. However, I
>> suspect that they will be too distracting. So... perhaps I should
>> casually
>> mention that magenta-cyan anaglyph looks doable. It requires adding the
>> blue channel to the frame that already has the red channel.
>> Magenta-green
>> should be doable too, but it seems a worse option.
>>
>> I apologize in advance, in case Dr. Stone or someone else eventually
>> decides to try one of these anaglyph variants, and the results aren't
>> better than conventional anaglyph.
>>
>> There is a method for seeing 3D in a normal LCD screen, using
>> cellophane (
>> http://individual.utoronto.ca/iizuka/research/cellophane.htm ). I tried
>> it
>> and was disappointed. However, I have a different laptop now, so I will
>> try again. Did anyone else try it?
>>
>> Thanks again
>>
>> Luis M. Sánchez
>>
>> On Sat, 21 Apr 2012 20:36:01 +0200, flavio seixas <oivalf_nix_at_yahoo.com>
>> wrote:
>> >Hi.
>> >What abou Zalman Stereo? It would be possible to implement it in future
>> >versions of vmd?
>> >
>> >This kind of stereo is much more friendly to user eyes and is being
>> used
>> >in different kinds of visualization software like Coot and CCP4mg.
>> >Regards,
>> >
>> >Flavio
>> >
>> >--- On Fri, 4/20/12, John Stone <johns_at_ks.uiuc.edu> wrote:
>> >
>> >>From: John Stone <johns_at_ks.uiuc.edu>
>> >>Subject: Re: vmd-l: Anaglyph stereo with other colors
>> >>To: "Luis M. Sánchez" <lmsp_at_uniovi.es>
>> >>Cc: "VMD-L" <vmd-l_at_ks.uiuc.edu>
>> >>Date: Friday, April 20, 2012, 11:27 PM
>> >>
>> >>Hi,
>> >> It is certainly possible to implement anaglyph for
>> >>many other
>> >>other color combinations. The only issue is that once
>> >>you get
>> >>away from the classic red/cyan glasses, the number of
>> >>possible
>> >>color combinations gets pretty large. The only other
>> >>issue is that
>> >>VMD currently uses the OpenGL color channel mask feature to
>> >>implement
>> >>the anaglyph color scheme, and to do color combinations that
>> >>are not
>> >>composed of combinations of 0% or 100% contributions from
>> >>each of
>> >>red, green, and blue will require a different rendering
>> >>approach, which
>> >>means that it will incur much more development time than you
>> >>might expect.
>> >>
>> >>In the end, I think anaglyph is best thought of as the
>> >>stereo option
>> >>of last resort when nothing else is
>> >>available/feasible. I would rather
>> >>invest time improving the non-anaglyph stereo modes in VMD
>> >>than to put
>> >>a bunch of time and energy into improving the lowest quality
>> >>option.
>> >>That said, if enough people tell me they want improved
>> >>anaglyph stereo,
>> >>I would be happy to work on it.
>> >>
>> >>Cheers,
>> >> John Stone
>> >> vmd_at_ks.uiuc.edu
>> >>
>> >>On Fri, Apr 20, 2012 at 03:09:19PM +0200, Luis M. Sánchez
>> >>wrote:
>> >>> Hi,
>> >>> Red-cyan and red-blue anaglyphs are affected by the
>> >>chromatic aberration> of our eyes. If I use VMD's anaglyph stereo and
>> >>close
>> >>one of my eyes, the> red image is blurrier than the other one. Also,
>> >>most of
>> >>the red color is> lost.
>> >>>
>> >>> Nowadays there are better color combinations for
>> >>anaglyphs:> http://en.wikipedia.org/wiki/Anaglyph_3D
>> >>. Suitable glasses are also> available from Amazon and other
>> companies.
>> >>>
>> >>> Is there an option to change the colors used by VMD's
>> >>anaglyp stereo? If> not, maybe we could have a magenta-cyan anaglyph
>> >>option
>> >>in the future?
>> >>>
>> >>> Thanks for a great program and best regards
>> >>>
>> >>> --
>> >>> Luis M. Sánchez
>> >>> IUOPA
>> >>> Edificio Severo Ochoa
>> >>> Campus del Cristo
>> >>> 33006 Oviedo
>> >>> Teléfono: 985 10 9620
>> >>
>> >>--
>> >>NIH Resource for Macromolecular Modeling and Bioinformatics
>> >>Beckman Institute for Advanced Science and Technology
>> >>University of Illinois, 405 N. Mathews Ave, Urbana, IL
>> >>61801
>> >>http://www.ks.uiuc.edu/~johns/ Phone: 217-244-3349
>> >>http://www.ks.uiuc.edu/Research/vmd/ Fax: 217-244-6078
> 

-- 
Luis M. Sánchez
IUOPA
Edificio Severo Ochoa
Campus del Cristo
33006 Oviedo
Teléfono: 985 10 9620