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.

pantiltCHOP_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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An Operator Family which operate on Channels (a sequence of numbers (Samples)) which are used for animation, audio, mathematics, simulation, logic, UI construction, and data streamed from/to devices and protocols.

An Operator Family that manipulates text strings: multi-line text or tables. Multi-line text is often a python Script or GLSL Shader, but can be any multi-line text. Tables are rows and columns of cells, each containing a text string.

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 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. TOPs have Channel Mask, a similar feature.

samples-per-second of a CHOP. Each CHOP in your network has a sample rate. In contrast, the overall timeline has a Frame Rate, which is the number of frames to cook and display per second, generally your monitor display frequency, default 60.

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.

The location of an operator within the TouchDesigner environment, for example, /geo1/circle1, a node called circle1 in a component called geo1. The path / is called Root. This path is displayed at the top of every Pane, showing which Component's network you are currently in. To refer instead to a filesystem folder, directory, disk file or http: address, see Folder.

Every operator in TouchDesigner has a set of control Parameters that can be integer or floating point numbers, menus, binary toggles, text strings or operator paths, which determine the output of the operator.

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