Hi Everyone,

Last summer I participated in GSoC 2016 and worked on the multi-view camera 
reconstruction project. Some of my efforts are summarized in this blog: 
http://hlzz.github.io/blender3/ <http://hlzz.github.io/blender3/>. And this 
patch (https://developer.blender.org/D2187 
<https://developer.blender.org/D2187>) is now being reviewed and revised. This 
year I would like to apply again and work on the camera breathing support, 
which is already requested by some users during the time I worked on the motion 
tracking project. Now I need clarifications for some specific problems. 

1. should we automatic detect the changes of focal lengths, or is it specified 
by users as additional inputs (like the focal length for each frame)? I know we 
can read exif tags to get focal lengths for photos. Do we have a similar 
approach for videos?

2. Is the current UI able to handle camera breathing, if we need additional 
inputs from users?

I think this project also has something to do with my revisions done on the 
motion tracking system last summer. Hopefully I should be able to merge the 
revisions and move towards the goal of automatic tracking.


Thanks,
Tianwei
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