The SoVRMLMovieTexture node defines a time-dependent texture map (contained in a movie file) and parameters for controlling the movie and the texture mapping.

<font color="#0000FF">NOTE:</font> This class does not exist in Open Inventor 10.0 and later.

VRML97 SPECIFICATION

This section describes the expected behavior of the node in a conforming VRML97 browser application. In some cases, the application is responsible for implementing portions of the expected behavior. Open Inventor viewer classes and IVF classes implement some of the application behaviors.

This section may reference portions of the VRML97 specification that are not present in this help file. The complete VRML97 spec is available at http://www.web3d.org.

The SoVRMLMovieTexture node defines a time dependent texture map (contained in a movie file) and parameters for controlling the movie and the texture mapping. An SoVRMLMovieTexture can also be used as the source of sound data for an SoVRMLSound node, but in this special case 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, t=0, and the top-right pixel of the image corresponds to s=1, t=1.

The url field that defines the movie data must support MPEG1-Systems (audio and video) or MPEG1-Video (video-only) movie file formats. See "Concepts - URLS and URNs" for details on the url field. It is recommended that implementations support grayscale or alpha transparency rendering if the specific movie format being used supports these features.

See "Concepts - Lighting Model" for 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) 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 affects on the SoVRMLMovieTexture node, are discussed in detail in the "Concepts - Time Dependent Nodes" section. The "cycle" of an SoVRMLMovieTexture is the length of time in seconds for one playing of the movie at the specified speed.

If an SoVRMLMovieTexture is inactive when the movie is first loaded, then frame 0 is shown in the texture if speed is nonnegative, or the last frame of the movie if speed is negative. A SoVRMLMovieTexture will always display frame 0 if speed = 0. For positive values of speed, the frame an active SoVRMLMovieTexture will display at time now corresponds to the frame at movie time (i.e., in the movie's local time system with frame 0 at time 0, at speed = 1):

    fmod (now - startTime, duration/speed)

    duration + fmod(now - startTime, duration/speed)

The speed exposedField indicates how fast the movie should be played. A speed of 2 indicates the movie plays twice as fast. Note that 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. However, content creators should note that this may not work for streaming movies or very large movie files.

SoVRMLMovieTexture can be referenced by an SoVRMLAppearance node's texture field (as a movie texture) and by an SoVRMLSound node's source field (as an audio source only). A legal implementation of the SoVRMLMovieTexture node is not required to play audio if speed is not equal to 1.

Differences between the VSG implementation and the VRML97 specification

- If the texture coordinates are less than 0, correct mapping is not
 guaranteed.

- If the texture coordinates are greater than 1, the mapping is not
 guaranteed if the #scaleTexCoord field is true.

- MPEG1-Video and MPEG2-Video (video-only, not audio) are supported.

- AVI-System (audio and video) is supported   <b><font color=#0000FF>[Windows only]</font></b>.

- Video Capture system (camera...) is supported (see #url field and #setVideoCaptureFormat()).

- Negative speed values are not supported.

- Additional fields for controlling texture mapping (i.e., #alpha, #model and #blendColor) and 
 texture coordinates (#scaleTexCoord) were added. Note: These new fields are not
 compatible with VRML97. If you set these fields to non-default values and then
 write a VRML file, the VRML file will not be readable by standard VRML97 readers.
 Older versions of Open Inventor will not be able to read
 the file either and will generate an Inventor read error (unknown
 field).

Limitations

• This node is not thread safe, so it does not work with the MultiPipe extension.

FILE FORMAT/DEFAULT

VRMLMovieTexture {

loop	false
speed	1
startTime	0
stopTime	0
pauseTime	0
resumeTime	0
url	[]
repeatS	true
repeatT	true
alpha	1.0
model	MODULATE
blendColor	0 0 0
scaleTexCoord	true
metadata	NULL

}

EVENTS

eventIn

SoSFBool	set_loop
SoSFFloat	set_speed
SoSFTime	set_startTime
SoSFTime	set_stopTime
SoSFTime	set_pauseTime (Note: Not implemented)
SoSFTime	set_resumeTime (Note: Not implemented)
SoMFFilePathString	set_url
SoSFNode	set_metadata

eventOut

SoSFTime	duration_changed
SoSFTime	elapsedTime (Note: Not implemented)
SoSFBool	isPaused (Note: Not implemented)
SoSFBool	isActive
SoSFBool	loop_changed
SoSFFloat	speed_changed
SoSFTime	startTime_changed
SoSFTime	stopTime_changed
SoSFTime	pauseTime_changed (Note: Not implemented)
SoSFTime	resumeTime_changed (Note: Not implemented)
SoMFFilePathString	url_changed
SoSFNode	metadata_changed

Obsoletesince Open Inventor 9500 The VRML API is no longer supported. See section http://oivdoc95.vsg3d.com/content/compatibility-notes-4#Deprecation of the Reference Manual.

Reference