SYNOPSIS
#include <Inventor/VRMLnodes/SoVRMLMovieTexture.h>
Inherits SoVRMLTexture.
Public Member Functions
virtual SoType getTypeId (void) const
SoVRMLMovieTexture (void)
virtual void GLRender (SoGLRenderAction *action)
Static Public Member Functions
static SoType getClassTypeId (void)
static void initClass (void)
Public Attributes
SoSFBool loop
SoSFFloat speed
SoSFTime startTime
SoSFTime stopTime
SoSFTime pauseTime
SoSFTime resumeTime
SoMFString url
SoSFTime duration_changed
SoSFBool isActive
SoSFFloat alpha
SoSFEnum model
SoSFColor blendColor
SoSFBool scaleTexCoord
Protected Member Functions
virtual const SoFieldData * getFieldData (void) const
virtual ~SoVRMLMovieTexture ()
Static Protected Member Functions
static const SoFieldData ** getFieldDataPtr (void)
Detailed Description
The SoVRMLMovieTexture class is used the map movies onto geometry.
The detailed class documentation is taken verbatim from the VRML97 standard (ISO/IEC 14772-1:1997). It is copyright The Web3D Consortium, and is used by permission of the Consortium:
MovieTexture {
exposedField SFBool loop FALSE
exposedField SFFloat speed 1.0 # (-inf, inf)
exposedField SFTime startTime 0 # (-inf, inf)
exposedField SFTime stopTime 0 # (-inf, inf)
exposedField MFString url []
field SFBool repeatS TRUE
field SFBool repeatT TRUE
eventOut SFTime duration_changed
eventOut SFBool isActive
}.fi
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 Details on the url field can be found in 4.5, VRML and the World Wide Web (http://www.web3d.org/x3d/specifications/vrml/ISO-IEC-14772-VRML97/part1/concepts.html#4.5). 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 (http://www.web3d.org/x3d/specifications/vrml/ISO-IEC-14772-VRML97/part1/concepts.html#4.6.11), for a general description of texture maps. 4.14, Lighting model (http://www.web3d.org/x3d/specifications/vrml/ISO-IEC-14772-VRML97/part1/concepts.html#4.14), 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 (http://www.web3d.org/x3d/specifications/vrml/ISO-IEC-14772-VRML97/part1/concepts.html#4.6.9).
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).fi
If speed is negative, the MovieTexture node displays the frame at movie time:
t = duration - ((now - startTime) modulo |duration/speed|).fi
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
SoVRMLMovieTexture::SoVRMLMovieTexture (void)
Constructor.SoVRMLMovieTexture::~SoVRMLMovieTexture () [protected], [virtual]
Destructor.Member Function Documentation
SoType SoVRMLMovieTexture::getClassTypeId (void) [static]
This static method returns the SoType object associated with objects of this class.Reimplemented from SoVRMLTexture.
SoType SoVRMLMovieTexture::getTypeId (void) const [virtual]
Returns the type identification of an object derived from a class inheriting SoBase. This is used for run-time type checking and 'downward' casting.Usage example:
void foo(SoNode * node)
{
if (node->getTypeId() == SoFile::getClassTypeId()) {
SoFile * filenode = (SoFile *)node; // safe downward cast, knows the type
}
}
For application programmers wanting to extend the library with new nodes, engines, nodekits, draggers or others: this method needs to be overridden in all subclasses. This is typically done as part of setting up the full type system for extension classes, which is usually accomplished by using the pre-defined macros available through for instance Inventor/nodes/SoSubNode.h (SO_NODE_INIT_CLASS and SO_NODE_CONSTRUCTOR for node classes), Inventor/engines/SoSubEngine.h (for engine classes) and so on.
For more information on writing Coin extensions, see the class documentation of the toplevel superclasses for the various class groups.
Reimplemented from SoVRMLTexture.
const SoFieldData ** SoVRMLMovieTexture::getFieldDataPtr (void) [static], [protected]
This API member is considered internal to the library, as it is not likely to be of interest to the application programmer.Reimplemented from SoVRMLTexture.
const SoFieldData * SoVRMLMovieTexture::getFieldData (void) const [protected], [virtual]
Returns a pointer to the class-wide field data storage object for this instance. If no fields are present, returns NULL.Reimplemented from SoVRMLTexture.
void SoVRMLMovieTexture::initClass (void) [static]
Sets up initialization for data common to all instances of this class, like submitting necessary information to the Coin type system.Reimplemented from SoVRMLTexture.
void SoVRMLMovieTexture::GLRender (SoGLRenderAction *action) [virtual]
Action method for the SoGLRenderAction.This is called during rendering traversals. Nodes influencing the rendering state in any way or who wants to throw geometry primitives at OpenGL overrides this method.
Reimplemented from SoVRMLTexture.
Member Data Documentation
SoSFBool SoVRMLMovieTexture::loop
Specifies whether movie should be looped or not. Default value is FALSE.SoSFFloat SoVRMLMovieTexture::speed
Specifies the relative speed. Default value is 1.0.SoSFTime SoVRMLMovieTexture::startTime
Specifies the start time.SoSFTime SoVRMLMovieTexture::stopTime
Specifies the stop time.SoMFString SoVRMLMovieTexture::url
The filename URL.SoSFTime SoVRMLMovieTexture::duration_changed
An eventOut that is signaled after the node is loaded or inserted in the scene graph.SoSFBool SoVRMLMovieTexture::isActive
An eventOut that is signaled when the movie begins/finishes playing.
Author
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