VR Toolbox, Inc. - QuickTime VR Glossary H-I

Technical Support - Glossary

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horizontal field of view	The horizontal angular expanse, visible through a camera.
horizontal spacing	The amount of rotation, expressed in degrees, that occurs between columns in an object or in source images in a panorama.
hot spot	An area in a QuickTime VR movie that permits user interaction.
hot spot action selector	A value passed to a mouse over hot spot procedure that indicates whether the cursor has entered, is in, or has left the hot spot.
hot spot atom	An atom in a QuickTime VR file that contains information about a hot spot. A hot spot atom is always a child of a hot spot parent atom.
hot spot callback routine	See mouse over hot spot procedure.
hot spot display button	A button in the controller bar that allows the user to highlight the visible hot spots.
hot spot ID	An unsigned long integer that uniquely identifies a hot spot.
hot spot image track	A video track in a QuickTime VR file that contains colored regions depicting the hot spots. For objects, an image in the hot spot image track must be synchronized in time to the corresponding image in the object image track.
hot spot parent atom	An atom in a QuickTime VR file that contains one or more hot spot atoms and their children.
hysteresis	The distance, in pixels, from the location of a mouse-down event, to the limit in which the cursor is considered not to have moved.
image	See movie image.
Image Compression Manager	The part of QuickTime that provides image compression and decompression services.
image track	See low-resolution image track, object image track, panorama image track.
imaging atom	An atom in a QuickTime VR file that describes the default imaging characteristics for one type of node in a scene. Imaging atoms are contained in an imaging parent atom. See also panorama-imaging atom.
imaging mode	A mode or state of a panoramic node that determines the type of drawing that is to be performed for the node.
imaging parent atom	An atom in a QuickTime VR file that contains one or more imaging atoms. Imaging property A property of a node that determines a drawing characteristic for that node (such as the image quality).
imaging property	A property of a node that determines a drawing characteristic for that node (such as the image quality).
instance	See QuickTime VR movie instance.
interaction property	A property of a QuickTime VR movie, whose value determines a specific mode of user interaction.
intercept procedure	A function, installed by a call to QTVRInstallInterceptProc , that is executed instead of (or in addition to) a QuickTime VR Manager function.
intercept selector	A constant that indicates which QuickTime VR Manager function to intercept. Defined by the QTVRProcSelector enumerated constants.
intercept structure	A data structure used to pass information to an intercept procedure. Defined by the QTVRInterceptRecord data type.

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