VR media

Overview

This section describes the QuickTime VR world and node information atom containers, which can be obtained by calling the QuickTime VR Manager routines QTVRGetVRWorld and QTVRGetNodeInfo. Those routines, as well as a complete discussion of QuickTime VR and how your application can create QuickTime VR movies, are described in detail in QuickTime VR.

Many atom types contained in the VR world and node information atom containers are unique within their container. For example, each has a single header atom. Most parent atoms within an atom container are unique as well, such as the node parent atom in the VR world atom container or the hot spot parent atom in the node information atom container. For these one-time-only atoms, the atom ID is always set to 1. Unless otherwise mentioned in the descriptions of the atoms that follow, assume that the atom ID is 1.

Note that many atom structures contain two version fields, majorVersion and minorVersion. The values of these fields correspond to the constants kQTVRMajorVersion and kQTVRMinorVersion found in the header file QuickTimeVRFormat.h. For QuickTime 2.0 files, these values are 2 and 0.

QuickTime provides a number of routines for both creating and accessing atom containers.

Some of the leaf atoms within the VR world and node information atom containers contain fields that specify the ID of string atoms that are siblings of the leaf atom. For example, the VR world header atom contains a field for the name of the scene. The string atom is a leaf atom whose atom type is kQTVRStringAtomType ('vrsg'). Its atom ID is that specified by the referring leaf atom.

Topics

Describing VR worlds

• QTVR string atom
• VR world atom container
• VR world header atom
• Imaging parent atom
• Panorama imaging atom

See Also

Media data atom types

• Sprite media
• Sprite track properties
• Sprite track media format
• Sprite media atom and data types
• Sprite button behaviors
• QT atom container description key
• Sprite media handler track properties QT atom container format
• Sprite media handler sample QT atom container formats
• Wired action grammar
• Tween media
• 3D media
• Node parent atom
• Node location atom structure ('nloc')
• Custom cursor atom
• Node information atom container