Inverse Kin CHOP

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Summary

The Inverse Kin CHOP calculates an inverse kinematics simulation for Bone objects.

PythonIcon.pnginversekinCHOP_Class


Parameters - Kinematics Page

Solver Type solvertype - - This parameter defines the method used to determine the motion of the Bone object when it, its ancestor, or its children are moved.

  • None none - No motion solution is applied to the Bone object.
  • Show Rest Position rest - This solver is used to show the rest position of the bones. It orients the bones at the rest position defined by the rest angles in the chain. These rest angles are used in the Inverse Kinematics solver. Therefore, this solver can be used as a helper utility to show you the rest positions of the chain.
  • Show Capture Position capture - This solver is used to display the rotation values in the capture angles parameter. These parameters are set in the Skeleton sop when a "capture points" operation is performed, or by using the Grab Capture Angles menu. Like the Show Rest Position solver, this solver can be used to return a chain to its capture orientation.
  • Inverse Kinematics inverse - The IK solver tries to position the bones such that the end of the last bone in the chain touches the origin of the object defined as the end affector. The shape of the chain is derived from the rest angles of each the bones in the chain.

In order to adjust the results of the IK solver, you can adjust the rest angles of the bones. Note that the IK solver's solutions are guaranteed to be continuous only for a given set of rest angles. If you animate the rest angles you may end up with chains that jump around. When using kinematics, the rotations given by the kinematic solver can be exported to the bones using by enabling the export flag on the Inverse Kin CHOP. Adding rotation values to bone objects in a kinematic chain is not recommended, as those values will be over-written by the kinematic solver.

  • IK with Constraints constraint -
  • Follow Curve curve - This solver positions the bones to be aligned along the first curve in an object. It is useful for animating things such as tails and spines.

Root Bone boneroot - The starting bone of the chain; where the chain starts.

End Bone boneend - If you specify a bone as the last bone in chain, then you will be defining a bone chain that has the current bone as the first in the chain and the bone chosen from the menu as the final bone in the chain. This chain includes all bones in between those just chosen.

End Affector endaffector - This specifies which object will serve as the chain's end affector.

Twist Affector twistaffector - If you specify a twist affector, the entire bone chain will twist along the axis from the chain's root to its end-affector so that the first bone is pointing as much as it can at the twist affector. The twist value can be specified as well, and is applied on top of the twist generated for the twist affector.

IK Twist iktwist - Amount of twist allowed by the kinematics solution.

IK Dampening ikdampen - Amount of damping (slows down at the extremes of angular allowability).  

Curve Object curve - Curve object to follow.



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 • ZED

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.

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.

The component types that are used to render 3D scenes: Geometry Component contain the 3D shapes to render, plus Camera, Light, Ambient Light, Null, Bone, Handle and other component types.

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'.