[Marble-devel] Review Request 118751: Spherical interpolation methods in GeoDataCoordinates

[Dennis Nienhüser]

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This is an automatically generated e-mail. To reply, visit:
https://git.reviewboard.kde.org/r/118751/
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(Updated June 17, 2014, 7:57 p.m.)


Status
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This change has been marked as submitted.


Review request for Marble and Torsten Rahn.


Repository: marble


Description
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- adds a method slerp() to GeoDataCoordinates for spherical linear interpolation. Merely a convenience one for the existing Quaternion::slerp()
- adds a method squad() to GeoDataCoordinates for spherical spline interpolation. Based on the work of Ken Shoemake, implemented according to Erik B. Dam, Martin Koch, Martin Lillholm. Quaternions, Interpolation and Animation, page 51, http://web.mit.edu/2.998/www/QuaternionReport1.pdf
- adds an example in examples/cpp/squad-interpolation which picks nearby cities from Marble's internal city database at random and interpolates paths between them. See screenshot and the video at http://nienhueser.de/marble/marble-squad-interpolation.html (plays in your browser)

squad will become useful to animate the camera path in KML Tour playback.

Food for thoughts/discussion:
- Is the current signature GeoDataCoordinates::squad(GC a, b, c, double t) better than a static one GeoDataCoordinates::squad(GC a, b, c, d, double t)?
- Shall we move it elsewhere? Imho GeoDataCoordinates is a better fit than e.g. MarblePhysics or GeoDataLineString


Diffs
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  examples/cpp/CMakeLists.txt f7075cc 
  examples/cpp/squad-interpolation/CMakeLists.txt PRE-CREATION 
  examples/cpp/squad-interpolation/squad-interpolation.h PRE-CREATION 
  examples/cpp/squad-interpolation/squad-interpolation.cpp PRE-CREATION 
  src/lib/marble/geodata/data/GeoDataCoordinates.h 89fba28 
  src/lib/marble/geodata/data/GeoDataCoordinates.cpp 2d2c117 
  src/lib/marble/geodata/data/GeoDataCoordinates_p.h 2d81e5e 

Diff: https://git.reviewboard.kde.org/r/118751/diff/


Testing
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File Attachments
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squad example
  https://git.reviewboard.kde.org/media/uploaded/files/2014/06/14/2c98d4b4-129f-4da6-905e-a5b0eb938aa4__marble-squad-interpolation-1.png


Thanks,

Dennis Nienhüser

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