[chimerax-users] Questions about focal length of camera in ChimeraX

[Tom Goddard]

Hi Bin,

  If you want orthoscopic projection use ChimeraX command

	camera ortho

See the camera command documentation for more options.

	https://www.cgl.ucsf.edu/chimerax/docs/user/commands/camera.html <https://www.cgl.ucsf.edu/chimerax/docs/user/commands/camera.html>

  Tom


> On Mar 24, 2021, at 10:47 AM, Bin Shi <binmse.shi at mail.utoronto.ca> wrote:
> 
> Emm. thank you, I will think about that. there seem to be relationships between the sizes of images in the screen coordinates and the sizes of volumes in the scene coordinates.  Since it is monoscopic with perspective, it doesn't seem to simply copy the orthographic projections into the images..
> 
> 
> Regards,
> 
> Bin
> From: Elaine Meng <meng at cgl.ucsf.edu <mailto:meng at cgl.ucsf.edu>>
> Sent: Wednesday, March 24, 2021 1:40 PM
> To: Bin Shi <binmse.shi at mail.utoronto.ca <mailto:binmse.shi at mail.utoronto.ca>>
> Cc: chimerax-users at cgl.ucsf.edu <mailto:chimerax-users at cgl.ucsf.edu> <chimerax-users at cgl.ucsf.edu <mailto:chimerax-users at cgl.ucsf.edu>>
> Subject: Re: [chimerax-users] Questions about focal length of camera in ChimeraX
>  
> EXTERNAL EMAIL:
> 
> Hi Bin,
> Focal length may not have a meaning in ChimeraX, because you can't make an image "out of focus" ... i.e., it doesn't get blurry at any distance.  There is only the angular field of view, eye separation, ... as explained in this page:
> 
> <https://rbvi.ucsf.edu/chimerax/docs/user/commands/camera.html <https://rbvi.ucsf.edu/chimerax/docs/user/commands/camera.html>>
> 
> I hope this helps,
> Elaine
> -----
> Elaine C. Meng, Ph.D.
> UCSF Chimera(X) team
> Department of Pharmaceutical Chemistry
> University of California, San Francisco
> 
> > On Mar 24, 2021, at 9:23 AM, Bin Shi <binmse.shi at mail.utoronto.ca <mailto:binmse.shi at mail.utoronto.ca>> wrote:
> >
> > Thanks very much for your software so that I can specify the camera position and then take a snapshot. However, I can't find the information on the focal length of the virtual camera.
> >
> > I am using mono (default) – monoscopic with perspective (apparent size decreasing with distance from the viewer), and I didn't see any details about the camera intrinsics.
> > Regards,
> > Bin
> 
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