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auto-capture example: capturing an image from a


 
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John Vidar Larring
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PostPosted: Tue Oct 28, 2008 2:35 pm    Post subject:
auto-capture example: capturing an image from a
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Hi all,

_Goal_: I'd like to make a command-line tool where I can open paged
database, set the camera at a particular position and supply a filename,
and the program will dump an image and exit.

% ./osgautocapture
Usage: ./osgautocapture [options] filename ...
Options:
--active Use active rendering instead of passive / lazy rendering
--camera <lat> <lon> <alt> <heading> <incline> <roll> Specify camera
position for image capture. Angles are specified in degrees and altitude
in meters above sealevel (e.g. --camera 55 10 300000 0 30 0)
--filename Filename for the captured image

Example below yields the attached image called autocapture.jpg:
./osgautocapture --camera 55 10 300000 0 30 0 --filename autocapture.jpg
http://www.openscenegraph.org/data/earth_bayarea/earth.ive

(Robert: thanks for making that database available;)

_Problem_: The image is blurred because the the necessary level of
detail has not been loaded when the image is captured (Ref: autocapture.jpg)

If I force to program to render the 180 frames before capturing, I'll
get at descent image (ref: autocapture_180_frames.jpg). However, this
approach will either not give a good result or take more time and
resources than necessary.

What I would like to do is to query the DatabasePager to find out
whether or not it needs load more tiles for the image to be rendered
with the correct level of detail. However, I can't seem to find the
correct method (or correct context for calling the method) for finding
out when the DatabasePager is done loading all necessary tiles.

Please, help. I'm quite stuck. The complete source code is attached to
this email.

Best regards,
John






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