FreeD CHOP

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Summary
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The FreeD CHOP reads incoming camera tracking data sent over a network using the FreeD protocol and outputs CHOP channels that can be used to control a virtual 3D camera.

The channels exported by the FreeD 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
rx, ry, rz - camera rotation, can be connected to the Camera COMP Rotate parameters
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 CHOP only processes the 'D1' camera position and orientation message that is part of the FreeD protocol. All other message types will be ignored.

For more information or to diagnose connection problems, an Info CHOP can be connected to see if any packets have been dropped or skipped.

PythonIcon.pngfreedCHOP_Class


Parameters - FreeD Page

Active active - While On, the CHOP receives FreeD information sent to the network port. While Off, no updating occurs.

Protocol protocol - - 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 - When using Multicast, this is the address that FreeD will listen for packets on.

Network Port port - The port which FreeD will accept packets on.

Local Address localaddress - - Specify an IP address to receive on, useful when the system has mulitple NICs (Network Interface Card) and you want to select which one to use.

  • 192.168.1.10 192.168.1.10 -


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.

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).

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