AcousticProperties
Overview
AcousticProperties specifies the interaction of sound waves with characteristics of geometric objects in the scene. Acoustic coefficient values are expected to fully account for physical and structural characteristics of associated geometry such as width, height, thickness, shape, softness and/or hardness, and density variations.
The AcousticProperties node belongs to the Shape component and requires at least support level 5, its default container field is acousticProperties. It is available from X3D version 4.0 or higher.
Hierarchy
1
2
3
+ X3DNode
+ X3DAppearanceChildNode
+ AcousticProperties
Fields
| Type | Access Type | Name | Default Value |
|---|---|---|---|
| SFNode | [in, out] | metadata | NULL |
| SFString | [in, out] | description | ”” |
| SFBool | [in, out] | enabled | TRUE |
| SFFloat | [in, out] | diffuse | 0 |
| SFFloat | [in, out] | specular | 0 |
| SFFloat | [in, out] | refraction | 0 |
| SFFloat | [in, out] | absorption | 0 |
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.
SFFloat [in, out] diffuse 0 [0,1]
diffuse coefficient of sound reflection indicates how much of the incident sound energy is reflected back in multiple directions.
SFFloat [in, out] specular 0 [0,1]
specular coefficient of sound reflection striking a plane surface, directly reflected back into space, where angle of reflection equals angle of incidence.
SFFloat [in, out] refraction 0 [0,1]
Sound refraction coefficient of a medium, which determines change in propagation direction of sound wave when obliquely crossing boundary between two mediums where its speed is different.
Hint
SFFloat [in, out] absorption 0 [0,1]
Specifies the sound absorption coefficient of a surface, meaning the ratio of sound intensity not reflected by a surface.
Advice
Hints
- AcousticProperties must have a parent Appearance node, and only affects geometry within the same Shape.
- Proxy geometry for acoustic response can be far simpler than geometry needed for visual rendering.
- X3D Architecture Figure 16.2 Sound Propagation Phenomena