OpenVR CHOP

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Summary

The OpenVR CHOP receives positional data from the OpenVR SDK. Each CHOP can output in one of 3 modes:

Tracking Sensors, Projection Matrices and Controllers:

OpenVRCHOP.2.png OpenVRCHOP.4.png OpenVRCHOP.3.png

Getting Sensor Data at Higher Rates

By default when running a VR system the file will be throttled to the speed of the VR devices refresh rate by the OpenVR SDK. This helps ensure the low latency output required for a good VR experience. If only controllers/Vive trackers are being used for tracking in a non-VR situation, the file can run and sample those devices at a higher sample rate as long as no OpenVR TOP in the project. If an OpenVR TOP is present anywhere in the project, then playback will be throttled to the VR devices refresh rate.

See also OpenVR, OpenVR TOP, OpenVR SOP, Audio Render CHOP

PythonIcon.pngopenvrCHOP_Class


Parameters - Setup Page

Active active - Control if this node is querying data from the OpenVR driver.

Output output - - Controls what kind of category of data will be output from this node.

  • Sensor sensor - Output data such as sensor orientation and general information such as render resolution.
  • Projection Matrices projmatrices - Output the projection matrices for each eye.
  • Controllers controllers - Output controller state.
  • Frame Timings frametimings -

Max Controllers maxcontrollers - The maximum number of controller whose data should be output from this node.

First Controller firstcontroller - The first controller number to be output. For example if this is set to 2 and Max Controllers is 2, then data for controllers 2 and 3 will be output.

Max Buttons maxbuttons - The maximum number of buttons whose channels should be output for each controller.

Max Analogs maxanalogs - The maximum number of analog inputs (sliders, trackpads, joysticks) whose channels should be output for each controller.

Orientation orientation - When doing 'Sensor' output, controls of the orientation channels will be output. By default the units for orientation are 1 unit = 1 meter.

General Info generalinfo - When doing 'Sensor' output, controls of general information channels will be output, such as render resolution and play area size.

Near near - When outputting 'Projection Matrices', controls the near plane the projection matrix will be built with.  

Far far - When outputting 'Projection Matrices', controls the far plane the projection matrix will be built with.  

Unit Scale unitscale - OpenVR by default works in a scale where 1 unit = 1 meter. This parameter allows the scale to be changed incase a scene is imported with a different scale.  



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).



CHOPs
Ableton Link • Analyze • Angle • Attribute • Audio Band EQ • Audio Device In • Audio Device Out • Audio Dynamics • Audio File In • Audio Filter • Audio Movie • Audio Oscillator • Audio Para EQ • Audio Play • Audio Render • Audio Spectrum • Audio Stream In • Audio Stream Out • Beat • BlackTrax • Blend • Clip Blender • Clip • Clock • Composite • Constant • Copy • Count • CPlusPlus • Cross • Cycle • DAT to • Delay • Delete • DMX In • DMX Out • Envelope • EtherDream • Event • Expression • Extend • Fan • Feedback • File In • File Out • Filter • Function • Gesture • Handle • Helios DAC • Hog • Hokuyo • Hold • In • Info • Interpolate • Introduction To CHOPs id• Inverse Curve • Inverse Kin • Join • Joystick • Keyboard In • Keyframe • Kinect • Lag • Leap Motion • Leuze ROD4 • LFO • Limit • Logic • Lookup • LTC In • LTC Out • Math • Merge • MIDI In • MIDI In Map • MIDI Out • Mouse In • Mouse Out • NatNet In • Noise • Null • Object • Oculus Audio • Oculus Rift • OpenVR • OSC In • OSC Out • Out • Override • Panel • Parameter • Pattern • Perform • Pipe In • Pipe Out • PosiStageNet • Pulse • RealSense • Record • Rename • Render Pick • Reorder • Replace • Resample • S Curve • Scan • Script • Select • Sequencer • Serial • Shared Mem In • Shared Mem Out • Shift • Shuffle • Slope • SOP to • Sort • Speed • Splice • Spring • Stretch • Switch • Sync In • Sync Out • Tablet • Time Slice • Timeline • Timer • TOP to • Touch In • Touch Out • Trail • Transform • Trigger • Trim • Warp • Wave

An Operator Family which operate on Channels (a series of numbers) which are used for animation, audio, mathematics, simulation, logic, UI construction, and many other applications.

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 only 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.

samples-per-second of a CHOP. Each CHOP in your network has a sample rate, whether it is used or not. The overall timeline has a "frame rate", which is the number of animation frames per second, generally your monitor display frequency.

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 command Script, 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/torus1, a node called torus1 in a component called geo1. The path / is called Root. To refer instead to a filesystem folder, directory, disk file or http: address, see Folder.

Parameters in TouchDesigner are an operator's settings (numbers, menus, flags, strings, paths) which the user can alter. Parameters for any operator can be opened by right-clicking on the operator and selecting "Parameters..." A currently selected operator's parameters can be viewed in a Network Editor by pressing the keyboard shortcut 'p'.

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