Programming With QuickTime VR 2.1
An angle range atom specifies the minimum and maximum allowable angles for some viewing limit or constraint. For example, the field-of-view constraint atom, the pan constraint atom, and the tilt constraint atom all specify constraints using an angle range atom. The structure of an angle range atom is defined by the VRAngleRangeAtom data type:
typedef struct VRAngleRangeAtom {
Float32 minimumAngle;
Float32 maximumAngle;
} VRAngleRangeAtom, *VRAngleRangeAtomPtr;