ListenerPointSource
Overview
ListenerPointSource node represents position and orientation of a person listening to virtual sound in the audio scene, and provides single or multiple sound channels as output. Multiple ListenerPointSource nodes can be active for sound processing.
The ListenerPointSource node belongs to the Sound component and requires at least support level 2, its default container field is children. It is available from X3D version 4.0 or higher.
Hierarchy
1
2
3
4
5
+ X3DNode
+ X3DChildNode
+ X3DTimeDependentNode
+ X3DSoundSourceNode
+ ListenerPointSource
Fields
| Type | Access Type | Name | Default Value |
|---|---|---|---|
| SFNode | [in, out] | metadata | NULL |
| SFString | [in, out] | description | ”” |
| SFBool | [in, out] | enabled | TRUE |
| SFBool | [in, out] | trackCurrentView | FALSE |
| SFVec3f | [in, out] | position | 0 0 0 |
| SFRotation | [in, out] | orientation | 0 0 1 0 |
| SFFloat | [in, out] | interauralDistance | 0 |
| SFBool | [in, out] | dopplerEnabled | FALSE |
SFNode [in, out] metadata NULL [X3DMetadataObject]
Information about this node can be contained in a MetadataBoolean, MetadataDouble, MetadataFloat, MetadataInteger, MetadataString or MetadataSet node.
Hint
SFString [in, out] description “”
Author-provided prose that describes intended purpose of the url asset.
Hint
- Many XML tools substitute XML character references for special characters automatically if needed within an attribute value (such as & for & ampersand character, or " for “ quotation-mark character).
SFBool [in, out] enabled TRUE
Enables/disables node operation.
SFBool [in, out] trackCurrentView FALSE
If trackCurrentView field is true then position and orientation match avatar’s (user’s) current view.
SFVec3f [in, out] position 0 0 0 (-∞,∞)
position (x, y, z in meters) relative to local coordinate system.
SFRotation [in, out] orientation 0 0 1 0 [-1,1] or (-∞,∞)
Rotation (axis, angle in radians) of listening point direction relative to default -Z axis direction in local coordinate system.
Hints
- This is orientation change from default direction (0 0 -1) along the -X axis.
- Complex rotations can be accomplished axis-by-axis using parent Transforms.
Warning
- For VR/AR/MR/XR users wearing a head-mounted display (HMD), animating this field may induce motion sickness.
SFFloat [in, out] interauralDistance 0 [0,∞) not supported
The interauralDistance field is .
SFBool [in, out] dopplerEnabled FALSE not supported
dopplerEnabled enables/disables whether real-time Doppler effects (due to relation motion between sources and listeners) are computed by browser between virtual sound sources and active listening locations, then applied to received frequency at active listening locations.
Hints
- Functional support requires player support for Sound component level 3.
- Wikipedia Doppler effect