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  2. Experimental:Pan Tilt CHOP

    Experimental:Pan Tilt CHOP

    Summary

    Calculate pan/tilt rotation values for a series of pan/tilt platforms like moving head light fixtures. Values are calculated to minimize flipping and angular rotation frame by frame. Multiple rigs are calculated per CHOP. The first input is the realtive position of the target to the fixture either as tx, ty, tz channels or a full set of transform channels as output by the Object CHOP. The angles are calculated to point the platform towards the target. If multiple platforms each have their individual moving target, the pan/tilt can be calculated by calculating the transform between target and fixture using the Object CHOP's DAT table parameter.

    PythonIcon.pngpantiltCHOP_Class


    Parameters - Pan/Tilt Page

    Reset reset - Discard current orientation of the rigs, and set their last known orientation to this value.

    Reset Values resetvals - ⊞ - The beginning rotation for each rig, expressed in degrees. The output orientation is based on this initial orientation, which may or may not be the same.
    • Reset Values resetvals1 - Pan reset value.
    • Reset Values resetvals2 - Tilt reset value.

    Clamp Pan clamppan - Limit the pan value to a specific range.

    Pan Range panrange - ⊞ - The lower and upper angle limits for the pan. Expressed in degrees.
    • Pan Range panrangemin - Lower pan value.
    • Pan Range panrangemax - Upper pan value.

    Clamp Tilt clamptilt - Limit the tilt value to a specific range.

    Tilt Range tiltrange - ⊞ - The lower and upper angle limits for the tilt. Expressed in degrees.
    • Tilt Range tiltrangemin - Lower tilt value.
    • Tilt Range tiltrangemax - Upper tilt value.


    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).


    Operator Inputs

    • Input 0: - Platform channels: Must include tx,ty,tz. Must be a full set of transform channels including transform and rotation order if rotation is included. Describes the location of each platform rig.
    • Input 1: - Reset values: Must include pan,tilt. Use this optional input to override the reset value for each individual platform rig.


    Info CHOP Channels

    Extra Information for the Pan Tilt 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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