XdkWrl: MovieTexture Class Reference

6.40 MovieTexture

The MovieTexture node defines a time dependent texture map (contained in a movie file) and parameters for controlling the movie and the texture mapping. A MovieTexture node can also be used as the source of sound data for a Sound node. In this special case, the MovieTexture node is not used for rendering.

Texture maps are defined in a 2D coordinate system (s, t) that ranges from 0.0 to 1.0 in both directions. The bottom edge of the image corresponds to the S-axis of the texture map, and left edge of the image corresponds to the T-axis of the texture map. The lower-left pixel of the image corresponds to s=0.0, t=0.0, and the top-right pixel of the image corresponds to s=1.0, t=1.0. Figure 6.12 depicts the texture map coordinate system of the MovieTexture.

Figure 6.12 -- MovieTexture node coordinate system

The url field that defines the movie data shall support MPEG1-Systems (audio and video) or MPEG1-Video (video-only) movie file formats 2.[MPEG]. Details on the url field can be found in 4.5, VRML and the World Wide Web.

MovieTexture nodes can be referenced by an Appearance node's texture field (as a movie texture) and by a Sound node's source field (as an audio source only).

See 4.6.11, Texture maps, for a general description of texture maps.

4.14, Lighting model, contains details on lighting equations and the interaction between textures, materials, and geometries.

As soon as the movie is loaded, a duration_changed eventOut is sent. This indicates the duration of the movie in seconds. This eventOut value can be read (for instance, by a Script node) to determine the duration of a movie. A value of "-1" implies the movie has not yet loaded or the value is unavailable for some reason.

The loop, startTime, and stopTime exposedFields and the isActive eventOut, and their effects on the MovieTexture node, are discussed in detail in the 4.6.9, Time-dependent nodes, section. The cycle of a MovieTexture node is the length of time in seconds for one playing of the movie at the specified speed.

The speed exposedField indicates how fast the movie shall be played. A speed of 2 indicates the movie plays twice as fast. The duration_changed output is not affected by the speed exposedField. set_speed events are ignored while the movie is playing. A negative speed implies that the movie will play backwards.

If a MovieTexture node is inactive when the movie is first loaded, frame 0 of the movie texture is displayed if speed is non-negative or the last frame of the movie texture is shown if speed is negative (see 4.11.3, Discrete and continuous changes). A MovieTexture node shall display frame 0 if speed = 0. For positive values of speed, an active MovieTexture node displays the frame at movie time t as follows (i.e., in the movie's local time system with frame 0 at time 0 with speed = 1):

    t = (now - startTime) modulo (duration/speed)

If speed is negative, the MovieTexture node displays the frame at movie time:

    t = duration - ((now - startTime) modulo |duration/speed|)

When a MovieTexture node becomes inactive, the frame corresponding to the time at which the MovieTexture became inactive will remain as the texture.

Constructor & Destructor Documentation

MovieTexture ( const char * name = "" )

Construct a node with all its fields set to default value, which is equivalent to the code below:

  loop = false;
  speed = 1;
  startTime.setNbSeconds(0);
  stopTime.setNbSeconds(0);
  repeatS = true;
  repeatT = true;

Member Function Documentation

wrl::Node * duplicate ( std::map< const Node *, Node * > & ) const [virtual]

Implements Node.

wrl::Node * duplicate ( ) const [virtual]

Returns a deep copy of this node, that is a fully independant node with all children (if any) also copied. This is mainly useful for instanciating protos.

Implements Node.

wrl::Node::EventInHandle eventIn ( const unsigned int n ) [virtual]

Return a handle on the i th event in of the node or a "unknown" typed handle if there is no such node. emarks This class has no eventIn. This function is useful, with nbEventsIn() if you want to traverse all events in of a Node.

Implements Node.

wrl::Node::EventInHandle eventIn ( const std::string & n ) [virtual]

Return a handle on the event in named n of the node or a "unknown" typed handle if there is no such event. Valid names are:

set_loop
set_speed
set_startTime
set_stopTime
set_url

Implements Node.

wrl::Node::EventOutHandle eventOut ( const unsigned int n ) [virtual]

Return a handle on the i th event out of the node or a "unknown" typed handle if there is no such node. Here is how i is related to fields:

0 : duration_changed
1 : isActive
2 : loop_changed
3 : speed_changed
4 : startTime_changed
5 : stopTime_changed
6 : url_changed This function is useful, with nbEventsOut() if you want to traverse all events in of a Node.

Implements Node.

wrl::Node::EventOutHandle eventOut ( const std::string & n ) [virtual]

Return a handle on the event out named n of the node or a "unknown" typed handle if there is no such event. Valid names are:

duration_changed
isActive
loop_changed
speed_changed
startTime_changed
stopTime_changed
url_changed

Implements Node.

wrl::Node::FieldHandle field ( const unsigned int n ) [virtual]

Return a handle on the i th field of the node or a "unknown" typed handle if there is no such node. Here is how i is related to fields:

0 : loop
1 : speed
2 : startTime
3 : stopTime
4 : url
5 : repeatS
6 : repeatT This function is useful, with nbFields() if you want to traverse all fields of a Node.

Implements Node.

wrl::Node::FieldHandle field ( const std::string & n ) [virtual]

Return a handle on the field named n of the node or a "unknown" typed handle if there is no such field. Valid names are:

loop
speed
startTime
stopTime
url
repeatS
repeatT

Implements Node.

bool isSetToDefaultValue ( const unsigned int i ) const [virtual]

Implements Node.

unsigned int nbEventsIn ( ) const [inline, virtual]

Returns the number of events in for this node type.

Implements Node.

unsigned int nbEventsOut ( ) const [inline, virtual]

Returns the number of events out for this node type.

Implements Node.

unsigned int nbFields ( ) const [inline, virtual]

Returns the number of fields (exposed or not) for this node type.

Implements Node.

const char * typeName ( ) const [inline, virtual]

Returns "MovieTexture". Useful for printing.

Implements Node.


Public Member Functions
	MovieTexture (const char *name="")
virtual	~MovieTexture ()
virtual unsigned int	nbFields () const
virtual FieldHandle	field (const std::string &n)
virtual FieldHandle	field (const unsigned int i)
virtual bool	isSetToDefaultValue (const unsigned int i) const
virtual unsigned int	nbEventsIn () const
virtual EventInHandle	eventIn (const std::string &n)
virtual EventInHandle	eventIn (const unsigned int i)
virtual unsigned int	nbEventsOut () const
virtual EventOutHandle	eventOut (const std::string &n)
virtual EventOutHandle	eventOut (const unsigned int i)
const char *	typeName () const
virtual Node *	duplicate () const
virtual Node *	duplicate (std::map< const Node , Node > &) const
Public Attributes
Exposed Fields
A field that is capable of receiving events via an eventIn to change its value(s), and generating events via an eventOut when its value(s) change.
SFBool	loop
SFFloat	speed
SFTime	startTime
SFTime	stopTime
MFString	url
Fields
A property or attribute of a node. Each node type has a fixed set of fields. Fields may contain various kinds of data and one or many values. Each field has a default value.
SFBool	repeatS
SFBool	repeatT
Events In
EventIn< SFBool >	set_loop
EventIn< SFFloat >	set_speed
EventIn< SFTime >	set_startTime
EventIn< SFTime >	set_stopTime
EventIn< MFString >	set_url
Events Out
EventOut< SFTime >	duration_changed
EventOut< SFBool >	isActive
EventOut< SFBool >	loop_changed
EventOut< SFFloat >	speed_changed
EventOut< SFTime >	startTime_changed
EventOut< SFTime >	stopTime_changed
EventOut< MFString >	url_changed

MovieTexture Class Reference
[Standard Node Types]

Public Member Functions

Public Attributes

Detailed Description

6.40 MovieTexture

Figure 6.12 -- MovieTexture node coordinate system

Constructor & Destructor Documentation

Member Function Documentation

Member Data Documentation

MovieTexture Class Reference [Standard Node Types]

Public Member Functions

Public Attributes

Detailed Description

6.40 MovieTexture

Figure 6.12 -- MovieTexture node coordinate system

Constructor & Destructor Documentation

Member Function Documentation

Member Data Documentation

MovieTexture Class Reference
[Standard Node Types]