Viewer Location Events¶

group FnViewerLocationEvent

struct ViewerLocationStateChanges¶

#include <FnViewerLocationEvent.h>

Struct containing Viewer Location Event state changes.

Public Functions

ViewerLocationStateChanges(FnViewerLocationEventBitField flags)¶

Constructor for creating a ViewerLocationStateChanges object based on a given viewer location event bit field of flags.

Parameters

flags -
The viewer location event bit field to parse in order to initialize the new object’s boolean member variables.

Public Members

bool locationRemoved¶: The scene graph location and all descendants have been removed from the scene graph.

bool attributesUpdated¶: The location has either been newly added, or its attributes have been updated. As ‘xform’ attributes are included, this is always true if localXformUpdated is true.

bool localXformUpdated¶: The local xform as been updated (the local matrix and/or its ‘isAbsolute’ state).

bool excludedChanged¶: The ‘excluded’ property has changed (see ViewerLocationEvent).

bool descendantsHiddenChanged¶: The ‘descendantsHidden’ property has changed (see ViewerLocationEvent).

struct ViewerLocationEvent¶

#include <FnViewerLocationEvent.h>

Struct describing a Viewer Location Event.

Public Functions

ViewerLocationEvent(const FnViewerLocationEventStruct &cStruct)¶

Constructor for creating a ViewerLocationEvent based on a given viewer location event data structure.

Parameters

FnViewerLocationEventStruct getCStruct() const¶

Return: A viewer location event data structure containing the details of this viewer location event.

Public Members

FnAttribute::GroupAttribute attributes¶: Location attributes (always provided).

FnAttribute::DoubleAttribute localXformMatrix¶: Location local transform as a 4x4 matrix (16 value DoubleAttribute) if one exists (always provided), otherwise an invalid attribute (which should be interpreted as an identity matrix, or otherwise ignored).

bool localXformIsAbsolute¶: True if the local transform is reset to identity using the ‘origin’ attribute convention. If true, the location’s ancestors’ transforms do not contribute to the global transform of this location and its descendants.

bool excluded¶: A location can be ‘excluded’ if it is not explicitly made visible, but a descendant location is. A location is also excluded if it is explicitly hidden or has a hidden ancestor. In these cases, any representation of the non-leaf location should not be drawn.

bool descendantsHidden¶: This property determines whether or not Viewer proxies are displayed, and is provided for use by custom proxy implementations. It is true if all of the location’s potential [non-virtual] descendants are explicitly hidden, or it has none to hide. This property is determined when the location is produced, and cannot rely on the final number of existing children once they are also cooked: i.e. this property be false for leaf locations that have *potential* children are deleted when cooked.

bool isVirtualLocation¶: Virtual locations are not part of the scene graph, but are generated as additional children based on location attributes, such as Viewer proxy locations. Note that location paths of virtual locations should always be distinguishable from real scene graph location paths.

ViewerLocationStateChanges stateChanges¶: Location state changes signalled by this event.