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Dennis Nienhüser authored
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 squad will become useful to animate the camera path in KML Tour playback. REVIEW: 118751
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