[vtkusers] Re: stereo parallel projection looks ok

[Dr. Daniel James White PhD]

Hi folks,
>
> Dan:
>
>> Yes, I guess parallel stereo doesn't make physical or theoretical 
>> sense, BUT, at least using my setup and my eyes, the parallel image 
>> using isosurfaces "looks" good, and there is a good impression of 
>> depth...... so I suppose it might "work" for ray casting methods 
>> also. The thing is, at present only the parallel mode is able to zoom 
>> in and out using volumepro1000. The perspective mode using 
>> volumepro1000 does work, but not zooming, only spinning around.
>> So it would be nice to use pseudo-nonsense-but-still-looks-ok stereo 
>> in parallel mode with the volumepro1000 mapper....
>> I hope the VTK bug fix corrects this....?
>
> I hope so too. The parallel-stereo mode will look very strange if you 
> rotate it more than 10-30 degrees, as the parts of the volume will 
> appear to expand as they move away and shrink as they move forward. 
> However, if it meets the goals of your visualization, there is no 
> reason not to do it.

Indeed the parallel projection does look slightly odd in stereo, BUT it 
does work for example for a wireframe outline of the data, or 
isosurface rendered stuff. Indeed the back face looks bigger than the 
front face, but because of the depth perception you get from the 2 
eyes, it doesn't hurt your brain at all and it is still very useable.

Dan

Dr. Daniel James White BSc. (Hons.) PhD
Cell Biology
Department of biological and environmental science
PO Box  35
University of Jyväskylä
Jyväskylä FIN 40014
Finland
+358 (0)14 260 4183 (work)
+358 (0)414740463 (mob)

http://www.chalkie.org.uk
dan at chalkie.org.uk
white at cc.jyu.fi