Nodes Channel nodes

Channel nodes create, filter, and manipulate channel data.

Usages in other examples

Example name Example for

Subtopics

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  • Acoustic
    Design audio filters and sound materials for the spatial audio system.
  • Area
    Calculates the area under a channel’s graph, which is the same as calculating the “integral” of a channel, or “integrating” the channel.
  • Attribute
    Adds, removes or updates attributes of the input chop.
  • Audio In
    Receives audio input from the analog audio ports or the digital port.
  • Band EQ
    A 14-band equalizer which filters audio input channels in the same way that a conventional band equalizer uses a bank of sliders to filter fixed-frequency bands of sound.
  • Beat
    Manually tap the beat of a piece of music, and automatically generate a repeating ramp or pulse that continues to keep time with the music after the taps stop.
  • Blend
    Combines two or more chops in input 2, 3 and so on, by using a set of blending channels in input 1.
  • BlendPose
    Performs multi-dimensional, example-based interpolation of channels.
  • Channel
    Creates channels from the value of its parameters.
  • Composite
    Layers (blends) the channels of one CHOP on the channels of another CHOP.
  • Constant
    Create up to forty new channels.
  • Copy
    Produces multiple copies of the second input along the timeline of the first input.
  • Count
    Counts the number of times a channel crosses a trigger or release threshold.
  • Cycle
    Creates cycles.
  • Delay
    Delays the input, and can be run in normal or time-sliced mode.
  • Delete
    Removes channels coming from its input.
  • Dynamics
    Extracts any information from a DOP simulation that is accessible through the dopfield expression function.
  • Envelope
    Outputs the maximum amplitude in the vicinity of each sample of the input.
  • Export
    A convenient tool for exporting channels.
  • Expression
    Modify input channels by using expressions.
  • Extend
    Only sets the “extend conditions” of a chop, which determines what values you get when sampling the CHOP before or after its interval.
  • Fan
    Used for controlling other CHOPs.
  • Feedback
    Get the state of a chop as it was one frame or time slice ago.
  • Fetch
    Imports channels from other OPs.
  • File
    Reads in channel and audio files for use by chops.
  • Filter
    Smooths or sharpens the input channels.
  • For
    Internal node used by the Foreach CHOP
  • Foreach
    Divides the input channels into groups, cooking the contained network for each group.
  • Function
    Provides more complicated math functions than found in the Math CHOP: trigonometic functions, logarithmic functions and exponential functions.
  • Geometry
    Uses a geometry object to choose a sop from which the channels will be created.
  • Gesture
  • Handle
    The “engine” which drives Inverse Kinematic solutions using the Handle object.
  • Hold
    Sample and hold the value of the first input.
  • IKSolver
    Solves inverse kinematics rotations for bone chains.
  • Image
    Converts rows and/or columns of pixels in an image to CHOP channels.
  • Interpolate
    Treats its multiple-inputs as keyframes and interpolates between them.
  • InverseKin
    Generates channels for bone objects based on a bone chain and an end affector.
  • Jiggle
    Creates a jiggling effect in the translate channels passed in.
  • Keyboard
    Turns key presses into channel output.
  • Lag
    Adds lag and overshoot to channels.
  • Limit
    Provides a variety of functions to limit and quantize the input channels.
  • Logic
    Converts channels of all its input chops into binary channels and combines them using a…
  • Lookup
    Uses a channel in the first input to index into a lookup table in the second input, and output values from the lookup table.
  • MIDI In
    The MIDI In CHOP reads Note events, Controller events, Program Change events, and Timing events from both midi devices and files.
  • MIDI Out
    The MIDI Out CHOP sends MIDI events to any available MIDI devices.
  • Math
    Perform a variety of arithmetic operations on and between channels.
  • Merge
    Takes multiple inputs and merges them into the output.
  • Mouse
    Outputs X and Y screen values for the mouse device.
  • Network
    Similar to the Pipe In/Out CHOPs in Network mode.
  • Noise
    Makes an irregular wave that never repeats, with values approximately in the range -1 to +1.
  • Null
    Used a place-holder and does not have a function of its own.
  • Object
    Compares two objects and returns information on their relative positions and orientations.
  • ObjectChain
    Creates channels representing the transforms for a chain of objects.
  • Oscillator
    Generates sounds in two ways.
  • Parametric EQ
    Filters an audio clip, and then applies other audio effects.
  • Particle
    Produces translate and rotate channels to move Objects according to the positions of particles in a POP Network.
  • Pass Filter
    Filters audio input using one of four different filter types.
  • Phoneme
    Translates english text into a series of phonetic values.
  • Pipe In
    Only works on IRIX; it is not tested under Linux or NT.
  • Pipe Out
    Transmit data out of Houdini to other processes.
  • Pretransform
    Takes translate, rotate, and/or scale channels and transforms them using the pretransform of the given object.
  • Pulse
    Generates pulses at regular intervals of one channel.
  • Puppet
    Interface to a variety of PuppetWorks devices through a serial port connection.
  • Record
  • Rename
    Renames channels.
  • Reorder
    Reorders the first input CHOP’s channels by numeric or alphabetic patterns.
  • Resample
    Resamples an input’s channels to a new rate and/or start/end interval.
  • Sequence
    Takes all its inputs and appends one chop after another.
  • Shift
    This time-shifts a CHOP, changing the start and end of the CHOP’s interval.
  • Shuffle
    Reorganizes a list of channels.
  • Slope
    Calculates the slope (or derivative) of the input channels.
  • Spatial Audio
    The rendering engine for producing 3D audio.
  • Spectrum
    Calculates the frequency spectrum of the input channels, or a portion of the channels.
  • Spline
    Edit the channel data by using direct manipulation of cubic or Bezier handles in the graph of the CHOP.
  • Spring
    Creates vibrations influenced by the input channels, as if a mass was attached to a spring.
  • Stretch
    Preserves the shape of channels and the sampling rate, but resamples the channels into a new interval.
  • Subnetwork
    Allows for the simplification of complex networks by collapsing several CHOPs into one.
  • Switch
    Control the flow of channels through a CHOPnet.
  • Transform
    Takes translate, rotate, and/or scale channels and transforms them.
  • TransformChain
    Combines a chain of translate, rotate, and/or scale channels.
  • Trigger
    Adds an audio-style attack/decay/sustain/release (ADSR) envelope to all trigger points in the input channels.
  • Trim
    Shortens or lengthens the input’s channels.
  • VEX Waveform
    This function is a sub-set of the waveform CHOP.
  • Vector
    Performs vector operations on a set or sets of channels.
  • Voice Split
    The Voice Split CHOP takes an audio track and separates “words” out into different channels.
  • Voice Sync
    The Voice Sync CHOP detects phonemes in an audio channel given some audio phoneme samples and pro…
  • Warp
    Time-warps the channels of the first input (the Pre-Warp Channels) using one warping channel in the second input.
  • Wave
    Creates a waveform that is repeated.