Titania X3D Editor

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Titania v3.0.4

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X3D Reference



SignalPdu is a networked Protocol Data Unit (PDU) information node that communicates the transmission of voice, audio or other data modeled in a simulation.

The SignalPdu node belongs to the DIS component and its container field is children. It is available since X3D version 3.0 or later.


* Derived from multiple interfaces.


SFNode [in, out] metadata NULL [X3DMetadataObject]

Metadata are not part of the X3D world and not interpreted by the X3D browser, but they can be accessed via the ECMAScript interface.

SFVec3f [ ] bboxSize -1 -1 -1

Bounding box size is usually omitted, and can easily be calculated automatically by an X3D player at scene-loading time with minimal computational cost. Bounding box size can also be defined as an optional authoring hint that suggests an optimization or constraint.


Can be useful for collision computations or inverse-kinematics (IK) engines.

SFVec3f [ ] bboxCenter 0 0 0

Bounding box center: optional hint for position offset from origin of local coordinate system.

SFBool [in, out] enabled TRUE

Enables/disables the sensor node.

SFBool [out] isActive

Have we had a network update recently?.

SFString [in, out] address "localhost"

Multicast network address, or else "localhost" example:

SFInt32 [in, out] applicationID 1 [0,65535]

Each simulation application that can respond to simulation management PDUs needs to have a unique applicationID.

MFInt32 [in, out] data [ ] [0,255]

Holds audio or digital data conveyed by the radio transmission. Interpretation of the field depends on values of encodingScheme and tdlType fields.

SFInt32 [in, out] dataLength [0,65535]

Number of bits of digital voice audio or digital data being sent in the Signal PDU. If the Encoding Class is database index, then dataLength field is set to 96.

SFInt32 [in, out] encodingScheme [0,65535]

Designates both Encoding Class and Encoding Type. Encoding Class enumerated value (2 most significant bits): 0 = Encoded Voice; 1 = Raw Binary Data; 2 = Application-Specific Data; 3 = Database Index. Encoding Type enumerated value (14 least significant bits): 1 = 8-bit mu-law; 2 = CVSD per MIL-STD-188-113; 3 = ADPCM per CCITT G.721; 4 = 16-bit linear PCM; 5 = 8-bit linear PCM; 6 = Vector Quantization.

SFInt32 [in, out] entityID [0,65535]

EntityID unique ID for entity within that application.

SFString [in, out] multicastRelayHost ""

Fallback server address if multicast not available locally. For example: track.nps.edu.

SFInt32 [in, out] multicastRelayPort

Fallback server port if multicast not available locally. For example: 8010.

SFString [in, out] networkMode "standAlone" ["standAlone"|

Whether this entity is ignoring the network, sending DIS packets to the network, or receiving DIS packets from the network. (1) standAlone: ignore network but still respond to events in local scene. (2) networkReader: listen to network and read PDU packets at readInterval, act as remotely linked copy of entity. (3) networkWriter: send PDU packets to network at writeInterval, act as master entity. Default value "standAlone" ensures that DIS network activation within a scene as networkReader or networkWriter is intentional.


Do not wrap extra quotation marks around these SFString enumeration values, since "quotation" "marks" are only used for MFString values. Network activity may have associated security issues.

SFInt32 [in, out] port

Multicast network port, for example: 62040.

SFInt32 [in, out] radioID

Identifies a particular radio within a given entity.

SFFloat [in, out] readInterval 0.1

Seconds between read updates, 0 means no reading.

SFBool [in, out] rtpHeaderExpected FALSE

Whether RTP headers are prepended to DIS PDUs.

SFInt32 [in, out] sampleRate

SampleRate gives either (1) sample rate in samples per second if Encoding Class is encoded audio, or (2) data rate in bits per second for data transmissions. If Encoding Class is database index, sampleRate is set to zero.

SFInt32 [in, out] samples

Number of samples in the PDU if the Encoding Class is encoded voice, otherwise the field is set to zero.

SFInt32 [in, out] siteID

Simulation/exercise siteID of the participating LAN or organization.

SFInt32 [in, out] tdlType

Tactical Data Link (TDL) type as an enumerated value when the Encoding Class is voice, raw binary, application-specific, or database index representation of a TDL message.

SFInt32 [in, out] whichGeometry 1

Select geometry to render: -1 for no geometry, 0 for text trace, 1 for default geometry, (optional) higher values to render different states.

SFFloat [in, out] writeInterval 1

Seconds between write updates, 0 means no writing (sending).

SFBool [out] isNetworkReader

Whether networkMode="remote" (listen to network as copy of remote entity)

SFBool [out] isNetworkWriter

Whether networkMode="master" (output to network as master entity at writeInterval)

SFBool [out] isRtpHeaderHeard

Whether incoming DIS packets have an RTP header prepended.

SFBool [out] isStandAlone

Whether networkMode="local" (ignore network but still respond to local events)

SFTime [out] timestamp

DIS timestamp in X3D units (seconds since 1 January 1970).



  • SignalPdu packets use the IEEE Distributed Interactive Simulation (DIS) protocol.
  • Include <component name='DIS' level='1'/>

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