FreeD Out CHOP

Summary

The FreeD Out CHOP sends camera tracking information, including position and orientation, to an external device or program over the network using the popular device-indepedent FreeD protocol. This can be used to emulate a physical camera or to send data to another program/device that can process FreeD tracking data. Data packets are sent out once per frame based on the current data in the CHOP channels. If one of the expected channels is not found in the input, then a default value will be sent. FreeD data can be received from other devices using the corresponding FreeD In CHOP.

The channels used by the FreeD Out CHOP are:

camera_id - a number from 0 - 255 that can be used to store an id number for the camera

tx, ty, tz - camera position, can be connected to the Camera COMP Translate parameters. Values can range from +/- 131.07m.

rx, ry, rz - camera rotation, can be connected to the Camera COMP Rotate parameters. Values can range from +/- 256 degrees.

focus - a 24-bit positive integer (0-16 million) in arbitrary units that relates to the focus ring on a camera lens. Applications can interpret this value according to the hardware in use.

zoom - a 24-bit positive integer (0-16 million) in arbitrary units that relates to the zoom ring on a camera lens. Applications can interpret this value according to the hardware in use.

user - a 16-bit positive integer (0 - 65k) that can be used by the camera system to send custom user-defined data

Note: The FreeD Out CHOP sends the 'D1' camera position and orientation message that is part of the FreeD protocol.

freedoutCHOP_Class

Parameters - FreeD Out Page

Active active - Turn this parameter off to stop sending out data packets.

Protocol protocol - ⊞ - Selects the network protocol to use. Refer to the Network Protocols article for more information.

• Messaging (UDP) msging -

• Multi-Cast Messaging (UDP) multicastmsging -

Network Address netaddress - The network address of the computer to send the Stype data to. The address can be a domain name, an IP address (e.g. 100.123.45.78), or "localhost" to target the packets at another program on the same machine.

Network Port port - The port to send the data packets to.

Local Address localaddress - Specify an IP address to send from. This is useful when the system has multiple NICs (Network Interface Card) and you want to select which one to use.

Parameters - Common Page

Time Slice timeslice - Turning this on forces the channels to be "Time Sliced". A Time Slice is the time between the last cook frame and the current cook frame.

Scope scope - To determine which channels get affected, some CHOPs use a Scope string on the Common page. See Pattern Matching.

Sample Rate Match srselect - ⊞ - Handle cases where multiple input CHOPs' sample rates are different. When Resampling occurs, the curves are interpolated according to the Interpolation Method Option, or "Linear" if the Interpolate Options are not available.

• Resample At First Input's Rate first - Use rate of first input to resample others.

• Resample At Maximum Rate max - Resample to the highest sample rate.

• Resample At Minimum Rate min - Resample to the lowest sample rate.

• Error If Rates Differ err - Doesn't accept conflicting sample rates.

Export Method exportmethod - ⊞ - This will determine how to connect the CHOP channel to the parameter. Refer to the Export article for more information.

• DAT Table by Index datindex - Uses the docked DAT table and references the channel via the index of the channel in the CHOP.

• DAT Table by Name datname - Uses the docked DAT table and references the channel via the name of the channel in the CHOP.

• Channel Name is Path:Parameter autoname - The channel is the full destination of where to export to, such has geo1/transform1:tx.

Export Root autoexportroot - This path points to the root node where all of the paths that exporting by Channel Name is Path:Parameter are relative to.

Export Table exporttable - The DAT used to hold the export information when using the DAT Table Export Methods (See above).

Operator Inputs

• Input 0: -

TouchDesigner Build: Latest\nwikieditor2022.24140before 2022.24140

An Operator Family which operate on Channels (a sequence of numbers (Samples)) which are used for animation, audio, mathematics, simulation, logic, UI construction, and data streamed from/to devices and protocols.

A Time Slice is the time from the last cook frame to the current cook frame. In CHOPs it is the set of short channels that contain the CHOP channels' samples between the last and the current cook frame.

A parameter in most CHOPs that restricts which channels of that CHOP will be affected. Normally all channels of a CHOP are affected by the operator. TOPs have Channel Mask, a similar feature.

samples-per-second of a CHOP. Each CHOP in your network has a sample rate. In contrast, the overall timeline has a Frame Rate, which is the number of frames to cook and display per second, generally your monitor display frequency, default 60.

Exporting is the connection of CHOP channels to parameters of operators. The output of each exporting CHOP is one or more channels, active only while the CHOP Viewer is on. The current value of a channel can be exported to a parameter of any operator, overriding that parameter's value. See Parameter.

An Operator Family that manipulates text strings: multi-line text or tables. Multi-line text is often a python Script or GLSL Shader, but can be any multi-line text. Tables are rows and columns of cells, each containing a text string.

The location of an operator within the TouchDesigner environment, for example, /geo1/circle1, a node called circle1 in a component called geo1. The path / is called Root. This path is displayed at the top of every Pane, showing which Component's network you are currently in. To refer instead to a filesystem folder, directory, disk file or http: address, see Folder.

Every operator in TouchDesigner has a set of control Parameters that can be integer or floating point numbers, menus, binary toggles, text strings or operator paths, which determine the output of the operator.

TouchDesigner is a hierarchy of components. "root" is the top-most network in the hierarchy. The Network Path or Path for root is simply /. A typical path is /project1/moviein1.