The OpenVR CHOP receives positional data, frame rendering info, and action data from the OpenVR SDK. Each CHOP can output in one of 5 modes: Sensors, Projection Matrices, Trackers, Frame Timings, Actions and Skeletons.
Actions are described in more details in OpenVR Actions.
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.
Parameters - Setup Page
active - Control if this node is querying data from the OpenVR driver.
output - ⊞ - Controls what kind of category of data will be output from this node.
sensor- Output data such as sensor orientation and general information such as render resolution.
- Projection Matrices
projmatrices- Output the projection matrices for each eye.
trackers- Output tracker states/transforms. This can both include Vive Trackers as well as just the transforms of controllers.
- Frame Timings
frametimings- General information regarding frame rendering.
actions- The action channels as defined by the OpenVR Actions in used by the system.
skeletons- Hand skeletal information, as descibed here. Note that 'Finger Tip Bones' is not supported anymore in OpenVR.
maxtrackers - The maximum number of trackers whose data should be output from this node.
firsttracker - The first tracker number to be output. For example if this is set to 2 and Max Trackers is 2, then data for trackers 2 and 3 will be output.
orientation - When doing 'Sensor' output, controls if the orientation channels will be output. By default the units for orientation are 1 unit = 1 meter.
generalinfo - When doing 'Sensor' output, controls of general information channels will be output, such as render resolution and play area size.
near - When outputting 'Projection Matrices', controls the near plane the projection matrix will be built with.
far - When outputting 'Projection Matrices', controls the far plane the projection matrix will be built with.
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.
customactions - Turn on to allow specifying a custom OpenVR Actions manifest file.
actionmanifest - A path to a OpenVR Actions manifest file. By default this is using the same manifest OpenVR uses when Custom Actions is disabled.
Use Legacy Names
uselegacynames - Use legacy channel naming convention coming from the Action Manifest. This should stay off unless loading existing old files.
skeletonrange - ⊞ - Controls the range of motion of the skeleton values.
- With Controller
withcontroller- Output skeleton taking into account the shape of the controller. The skeleton will look like it's holding the controller.
- Without Controller
withoutcontroller- Output the skeleton as if the controller dose not exist. This allows the skeleton to create a fully closed fist.
Parameters - Common Page
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 - 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.
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
autoexportroot - This path points to the root node where all of the paths that exporting by Channel Name is Path:Parameter are relative to.
exporttable - The DAT used to hold the export information when using the DAT Table Export Methods (See above).