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VRML Script Tutorial
Full list
VRML Interactive Tutorial
Introduction
VRML File Structure
Drawing: Shape node
Geometry Nodes:
Appearance
Let there be Light
Materials with Colored Lights
Hierarchical Node Structures
Inlining Files
Defining and Instancing Nodes
Defining Levels of Detail
Events in VRML
Interpolators
Let the Music Play
Bindable Nodes
Adding Realism to the world
Information about your world
Definition for Auxiliary Nodes
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AudioClip Node
This node specifies the location and properties of an audio source for
the Sound node. The file specified in the url
must be in either a MIDI or WAVE format.
The following fields are present in this node:;
loop specifies if the sound is to play repeatedly, see notes
after field definition.;
pitch specifies the speed at which the sound will play, for
instance if pitch is 2 then the sound will play twice as fast. Only
positive values are allowed.
startTime specifies the starting Time of the sound in seconds.
The value of this field is the number of seconds since midnight, January
the first, 1970.;
stopTime specifies the stopping time of the sound in seconds.
The value of this field is the number of seconds since midnight, January
the first, 1970.;
url which specifies the location of the sound. You can specify
multiple locations if you want to, the browser will look for data in those
locations in decreasing order of preference.
description is a string which can be used to describe the sound.
The browser is not required to display the string.;
Notes:;
In VRML the world was created at midnight, January the first, 1970.
Some say that the reason for choosing this date as the beginning of time
as to do with the birth of the Unix system.;
If the loop is set to TRUE and startTime >= stopTime
then the sound will play forever. However if startTime < stopTime
the sound will stop as soon as stopTime is reached.;
If startTime >= stopTime then the sound should start
as soon as startTime is reached. Note that some browsers only start
the sound when startTime > stopTime. This is because in
the early drafts of the VRML 2.0 specification this later condition was
required to start the sound.;
All fields are optional, the default values being applied if the field
is not specified. Note: if you do not specify the location of the sound,
url, then no sound will be played.
Syntax:
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AudioClip { |
loop FALSE
pitch 1.0
startTime 0
stopTime 0
url [ ]
description ""
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} |
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The AudioClip node has two eventOut
fields: duration_changed and isActive. A duration_changed
event is generated when the current url is changed, the value for this
event is the time in seconds of the sound. Note that changing the pitch
does not produce a duration_changed event. The event isActive
with a value TRUE is generated when the sound starts playing, when
the sound stops the event isActive will output FALSE.
To play the sound in the example provided press the mouse button over the
sphere. Note that, in the example provided, once the sound has started
you can't restart it by pressing the sphere.
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