Programming with QuickTime VR

QTVR Track

As mentioned earlier, the QTVR track is a special type of QuickTime track that maintains a list of all the nodes in a movie. The media type for a QTVR track is 'qtvr' . All the media samples in a QTVR track share a common sample description, which contains the VR world atom container. The VR world atom container includes such information as the name for the entire scene, the default node ID, and default imaging properties, as well as a list of the nodes contained in the QTVR track.

A VR world can also contain custom scene information. QuickTime VR ignores any atom types that it doesn't recognize, but you can extract those atoms from the VR world using standard QuickTime atom functions.

The QTVR track contains one media sample for each node in the movie. Each sample contains a node information atom container. The node information includes general information about the node such as the node's type, ID, and name. The node information atom container also contains the list of hot spots for the node.

In QuickTime VR movie files, all angular values are stored as 32-bit floating-point values that specify degrees. In addition, all floating-point values conform to the IEEE Standard 754 for binary floating-point arithmetic, in big-endian format.