Quicktime File Format (2012-08-14).pdf

Media Data Atom TypesHot Spot Image Tracksstruct QTVRCubicFaceData {floatfloatfloatfloatorientation[4];center[2];aspect;skew;};typedef struct QTVRCubicFaceDataQTVRCubicFaceData;The mathematical explanation of these data structures is beyond the scope of this document but will bedescribed in a separate Apple Technote. Table 4-28 (page 300) shows what values QuickTime VR uses for thedefault representation of six square sides.Table 4-28Values used for representing sidesOrientationOrientationOrientationOrientationCenterCenterAspectSkewSide10000010# front–.50.500010# right00100010# back.50.500010# left.5.5000010# top–.5.5000010# bottomHot Spot Image TracksNote VR Media is deprecated in the QuickTime file format. The information that follows is intendedto document existing content containing VR Media and should not be used for new development.When a panorama contains hot spots, the movie file contains a hot spot image track, a video track that containsa parallel panorama, with the hot spots designated by colored regions. Each diced frame of the hot spotpanoramic image must be compressed with a lossless compressor (such as QuickTime’s graphics compressor).2012-08-14 | © 2004, 2012 Apple Inc. All Rights Reserved.300