Oculus Rift CHOP

Summary

NOTE

OS: This operator is only supported under the Microsoft Windows operating system.

The Oculus Rift CHOP connects to an Oculus Rift device and outputs several useful sets of channels that can be used to integrate the Oculus Rift into projects.

You can view the detected orientation of the device and put the rotation values directly into other operators. To help decrease latency, prediction can be used to guess what the orientation will be at some point in the future.

The raw sensor data is also available, with options for both sensor acceleration and angular velocity.

The devices calibration parameters are another option. These can be used to generate the projection matrices and distortion shaders, although both of these are already available (see below and Oculus Rift TOP). This data is constant, but may differ on future devices.

The last two things the Oculus Rift CHOP can output are the left and right eye projection matrices. These can be (and will need to be) passed into a camera's "Custom Projection" parameter in order to provide a proper 3D experience with the Oculus Rift. For convenience, the channels are aligned to be passed in directly by reference.

Without an Oculus Rift device connected the CHOP uses default values and will output channels corresponding to the Oculus Rift Developer Kit device. This allows you to design something for the Oculus Rift without actually having one.

Parameters - Setup Page

Active active - When on, this CHOP will update it's data when it cooks.

Output output - ⊞ - Switches between three different output modes.

HMD hmd - Can output orientation, acceleration, angular velocity and device info.

Left Controller leftcontroller - Output channels correspond to inputs from the Left Oculus Controller.

Right Controller rightcontroller - Output channels correspond to inputs from the Right Oculus Controller.

Left Projection Matrix leftmatrix - Output channels correspond to the projection matrix for the left eye.

Right Projection Matrix rightmatrix - Output channels correspond to the projection matrix for the right eye.

Orientation orientation - When on, the output channels will include sensor orientation.

Re-Center recenter - Resets the xyz positional components and the y orientation component of the tracking space for the HMD and controllers using the HMD's current tracking position.

Acceleration acceleration - When on, the output channels will include acceleration.

Velocity velocity - When on, the output channels will include velocity.

Device Info deviceinfo - When on, the output channels will include device info.

Controller Buttons controllerbuttons - When on, the output channels will include controller button states.

Near near - Specifies the distance of the near clipping plane for the projection matrix.

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).

Export Table exporttable -

Info CHOP Channels

Extra Information for the Oculus Rift CHOP can be accessed via an Info CHOP.

Common CHOP Info Channels

start - Start of the CHOP interval in samples.

length - Number of samples in the CHOP.

sample_rate - The samplerate of the channels in frames per second.

num_channels - Number of channels in the CHOP.

time_slice - 1 if CHOP is Time Slice enabled, 0 otherwise.

export_sernum - A count of how often the export connections have been updated.

Common Operator Info Channels

total_cooks - Number of times the operator has cooked since the process started.

cook_time - Duration of the last cook in milliseconds.

cook_frame - Frame number when this operator was last cooked relative to the component timeline.

cook_abs_frame - Frame number when this operator was last cooked relative to the absolute time.

cook_start_time - Time in milliseconds at which the operator started cooking in the frame it was cooked.

cook_end_time - Time in milliseconds at which the operator finished cooking in the frame it was cooked.

cooked_this_frame - 1 if operator was cooked this frame.

warnings - Number of warnings in this operator if any.

errors - Number of errors in this operator if any.

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