{
  "id": "noise_chop",
  "name": "Noise CHOP",
  "displayName": "Noise CHOP",
  "category": "CHOP",
  "subcategory": "Generators",
  "version": "",
  "lastUpdated": "2025-08-07T07:50:04.743Z",
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  "description": "The Noise CHOP makes an irregular wave that never repeats, with values approximately in the range -1 to +1.",
  "summary": "The Noise CHOP makes an irregular wave that never repeats, with values approximately in the range -1 to +1.",
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      "description": "From Derivative\n\t\t\n\t\t\n\t\t\n\t\t\n\t\tJump to navigation\n\t\tJump to search\n\t\t\nThe Noise  makes an irregular wave that never repeats, with values approximately in the range -1 to +1.\t\t\nIt generates both smooth curves and noise that is random each sample. It uses the same math as the Noise SOP.\t\t\t\nYou can create several curves with different shapes, and you can adjust period, amplitude, harmonics and more.\t\t\t\nOptionally, an input can be connected. It is assumed that the input contains 1 to 3 channels representing X, Y and Z coordinates of points in space, and are used to sample anywhere in 3D noise space. One index in the input produces one sample in the output.\t\t\t\nAll noise functions work identically with Time Slicing on and off, with the exception of Harmonic Summation and Brownian whose methods cannot be limited to 1 in  mode. When the Timeline wraps around to frame 1, the noise functions will continue uninterrupted.\nnoiseCHOP_Class\n\nContents\n \n \n \n \n \n \n \n \n \n \n\n\n\n\n\n  type -  - The noise function used to generate noise. The functions available are:\n\n sparse - Produces high quality, continuous noise based on Sparse Convolution. hermite - Quicker than Sparse, but produces lower quality noise. harmonic - Sparse noise with the ability to control the frequency step of the harmonics. Slowest type. brownian - Works like a bug in random flight. With Num of Integrals at 2, its acceleration is changed randomly every frame. random - (White Noise) Every sample is random and unrelated to any other sample. It is the same as \"white noise\" in audio. alligator - Cell Noise.\n\t\t\n  seed - Any number, integer or non-integer, which starts the random number generator. Each number gives completely different noise patterns, but with similar characteristics.\n\n\n\t\t\n  period - The approximate separation between peaks of a noise cycle. It is expressed in Units. Increasing the period stretches the noise pattern out.\t\nPeriod is the opposite of frequency. If the period is 2 seconds, the base frequency is 0.5 cycles per second, or 0.5Hz for short. Hz refers to Hertz, the electrical and audio engineer of the 19th century, not the car guy.\nIf the Type is set to Random, setting this to zero will produce completely random noise. Otherwise, the period should be greater than zero.\n\n\n\t\t\n  periodunit - Select the units to use for this parameter, Samples, Frames, Seconds, or Fraction.\n\n\n\t\t\n  harmon - The number of higher frequency components to layer on top of the base frequency. The higher this number, the bumpier the noise will be (as long as roughness is not set to zero). 0 harmonics give the base shape.\t\nHarmonics with a base frequency of 0.1Hz will by default produce harmonics at 0.2Hz, 0.4Hz, 0.8Hz, etc. (up to the number of harmonics specified by the Harmonics parameter).\n\n\n\t\t\n  spread - The factor by which the frequency of the harmonics are increased. It is normally 2. A spread of 3 and a base frequency of 0.1Hz will produce harmonics at 0.3Hz, 0.9Hz, 2.7Hz, etc. This parameter is only valid for the Harmonic Summation type.\n\n\n\t\t\n  rough - Controls the effect of the higher frequency noise. When roughness is zero, all harmonics above the base frequency have no effect. At one, all harmonics are equal in amplitude to the base frequency. When roughness is between one and zero, the amplitude of higher harmonics drops off exponentially from the base frequency.\t\nThe default roughness is 0.5. This means the amplitude of the first harmonic is 0.5 of the base frequency, the second is 0.25, the third is 0.125. The harmonics are added to the base to give the final shape. The Harmonics parameter and the Roughness parameter must both be non-zero to see the harmonic effects.\n\n\n\t\t\n  exp - Pushes the noise values toward 0, or +1 and -1. (It raises the value to the power of the exponent.) Exponents greater than one will pull the channel toward zero, and powers less than one will pull peaks towards +1 and -1. It is used to reshape the channels.\n\n\n\t\t\n  numint - Defines the number of times to integrate (see the Area  p. 114) the Brownian noise. Higher values produce smoother curves with fewer features. Values beyond 4 produce somewhat identical curves. This parameter is only valid for the Random noise type.\n\n\n\t\t\n  amp - Defines the noise value's amplitude (a scale on the values output).\n\n\n\t\t\n  reset - Only available if operator's  Parameter is on. Toggling this parameter will reset the noise calculation and hold the value until the parameter is released again.\n\n\n\t\t\n  resetpulse - Only available if operator's  Parameter is on. Pulsing this parameter will reset the noise calculation.\n\n\n\n\n\nThe Translate, Rotate, Scale and Pivot parameters let you sample in a different part of the 3D noise space. Imagine a different noise value for every XYZ point in space. Normally, the Noise  samples the noise space from (0,0,0) along the X-axis in steps of 2/period. /tx /ty /tz /rx /ry /rx /sx /sy /sz /px /py /pz\t\t\n\nBy changing the transform, you are translating, rotating and scaling the line along which the Noise CHOPs samples the noise space. A slight Y-rotation is like walking in a straight path in the mountains, recording your altitude along the way, then re-starting from the same initial location, walking in a slightly different direction. Your altitude starts off being similar but then diverges.  xord -  - Changing the Transform Order will change where things go much the same way as going a block and turning east gets you to a different place than turning east and then going a block. In matrix math terms, if we use the 'multiply vector on the right' (column vector) convention, a transform order of Scale, Rotate, Translate would be written as T * R * S * Position\n\n srt - str - rst - rts - tsr - trs -\n\t\t\n  rord -  - As with transform order (above), changing the order in which the rotations take place will alter the final position and orientation. A Rotation order of Rx Ry Rz would create the final rotation matrix as follows R = Rz * Ry * Rx\n\n xyz - xzy - yxz - yzx - zxy - zyx -\n\t\t\n  t -  - XYZ translation values.\n\n tx - ty - tz -\n\t\t\n  r -  - XYZ rotation, in degrees.\n\n rx - ry - rz -\n\t\t\n  s -  - XYZ scale to shrink or enlarge the transform.\n\n sx - sy - sz -\n\t\t\n  p -  - XYZ pivot to apply the above operations around.\n\n px - py - pz -\n\n\n\n  constraint -  - Constraint and its parameters allows the noise curve to start and/or end at selected values. The mean value may also be enforced. Note: This only works when  is Off because time slicing has no pre-determined start/end.\n\n none - No constraints set. start - Sets the noise starting position to the value set in 'Starting Value' parameter below. end - Sets the noise ending position to the value set in 'Ending Value' parameter below. offset - Sets the noise mean position to the value set in the 'Mean Value' parameter below. endpoints - Set the starting and ending position of the noise separately using the parameters below.\n\t\t\n  constrstart - Value for the starting position.\n\n\n\t\t\n  constrend - Value for the ending position.\n\n\n\t\t\n  constrmean - Value for the mean value of the noise.\n\n\n\t\t\n  normal - Ensures that all noise curves fall between -1 and 1. Applied before the Amplitude parameter. Only valid for Random and Harmonic Summation noise types, since Hermite and Sparse noise are always normalized. Normalizing random noise occurs between integrations, producing a more controlled curve. Note: This only works when  is Off because time slicing has no pre-determined start/end.\n\n\n\n\n\n  channelname - You can creates many channels with simple patterns like \"chan[1-20]\", which generates 20 channels from chan1 to chan20. See the section, Common  Parameters for a description of this and all Options. See Scope and Channel Name Matching Options. Each channel has a unique seed, so all channels will be different with the same parameter settings.\n\n\n\t\t\n  start - Start of the interval, expressed in Units (seconds, frames or samples).\n\n\n\t\t\n  startunit - Select the units to use for this parameter, Samples, Frames, or Seconds.\n\n\n\t\t\n  end - End of the interval, expressed in Units (seconds, frames or samples).\n\n\n\t\t\n  endunit - Select the units to use for this parameter, Samples, Frames, or Seconds.\n\n\n\t\t\n  rate - The sample rate of the channels, in samples per second. Default: \n\n\n\t\t\n  left -  - The left extend conditions (before/after range).\n\n hold - Hold the current value of the channel. slope - Continue the slope before the start of the channel. cycle - Cycle the channel repeatedly. mirror - Cycle the channel repeatedly, mirroring every other cycle. default - Use the constant value specified in the Default Value parameter.\n\t\t\n  right -  - The right extend conditions (before/after range).\n\n hold - Hold the current value of the channel. slope - Continue the slope after the end of the channel. cycle - Cycle the channel repeatedly. mirror - Cycle the channel repeatedly, mirroring every other cycle. default - Use the constant value specified in the Default Value parameter.\n\t\t\n  defval - The value used for the Default Value extend condition.\n\n\n\n\n\n  timeslice - Turning this on forces the channels to be \"Time Sliced\".  A  is the time between the last cook frame and the current cook frame.\n\n\n\n  scope - To determine which channels get affected, some CHOPs use a  string on the Common page.\n\n\n\n  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.\n\n first - Use rate of first input to resample others. max - Resample to the highest sample rate. min - Resample to the lowest sample rate. err - Doesn't accept conflicting sample rates.\n\n  exportmethod -  - This will determine how to connect the  channel to the parameter. Refer to the Export article for more information.\n\n datindex - Uses the docked  table and references the channel via the index of the channel in the . datname - Uses the docked  table and references the channel via the name of the channel in the . autoname - The channel is the full destination of where to export to, such has geo1/transform1:tx.\n\n  autoexportroot - This path points to the root node where all of the paths that exporting by Channel Name is : are relative to.\n\n\n\n  exporttable - The  used to hold the export information when using the  Table  Methods (See above).\n\n\n\n\n\n -\n\nExtra Information for the Noise  can be accessed via an Info CHOP.\n\n\n\n - Start of the  interval in samples. - Number of samples in the . - The samplerate of the channels in frames per second. - Number of channels in the . - 1 if  is  enabled, 0 otherwise. - A count of how often the export connections have been updated.\n - Number of times the operator has cooked since the process started. - Duration of the last cook in milliseconds. - Frame number when this operator was last cooked relative to the component timeline. - Frame number when this operator was last cooked relative to the absolute time. - Time in milliseconds at which the operator started cooking in the frame it was cooked. - Time in milliseconds at which the operator finished cooking in the frame it was cooked. - 1 if operator was cooked this frame. - Number of warnings in this operator if any. - Number of errors in this operator if any.\nTouchDesigner Build: Latest\\n2021.100002018.28070before 2018.28070\nCHOPs\n• • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • \n\nAn 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.\n\n\n\nA 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.\n\n\n\nTo \"pulse\" a parameter is to send it a signal from (1) an exported CHOP channel or (2) a python command or (3) a mouse click that causes a new action to occur immediately. A pulse via python is via the .pulse() function on a pulse-type parameter, such as Reset parameter in a Speed CHOP. A pulse from a CHOP is typically a 0 to 1 to 0 signal in an exported channel.\n\n\n\nsamples-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.\n\n\n\nA 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.\n\n\n\nExporting 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.\n\n\n\nAn 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.\n\n\n\nThe 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.\n\n\n\nEvery 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.\n\n\n\nTouchDesigner 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.\n\n\n\n\n\n\n\n\nRetrieved from \"https://docs.derivative.ca/index.php?title=Noise_CHOP&oldid=24067\"\n\t\tCategory: CHOPs",
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      "description": "From Derivative\n\t\t\n\t\t\n\t\t\n\t\t\n\t\tJump to navigation\n\t\tJump to search\n\t\t\nThe Noise  makes an irregular wave that never repeats, with values approximately in the range -1 to +1.\t\t\nIt generates both smooth curves and noise that is random each sample. It uses the same math as the Noise SOP.\t\t\t\nYou can create several curves with different shapes, and you can adjust period, amplitude, harmonics and more.\t\t\t\nOptionally, an input can be connected. It is assumed that the input contains 1 to 3 channels representing X, Y and Z coordinates of points in space, and are used to sample anywhere in 3D noise space. One index in the input produces one sample in the output.\t\t\t\nAll noise functions work identically with Time Slicing on and off, with the exception of Harmonic Summation and Brownian whose methods cannot be limited to 1 in  mode. When the Timeline wraps around to frame 1, the noise functions will continue uninterrupted.\nnoiseCHOP_Class\n\nContents\n \n \n \n \n \n \n \n \n \n \n\n\n\n\n\n  type -  - The noise function used to generate noise. The functions available are:\n\n sparse - Produces high quality, continuous noise based on Sparse Convolution. hermite - Quicker than Sparse, but produces lower quality noise. harmonic - Sparse noise with the ability to control the frequency step of the harmonics. Slowest type. brownian - Works like a bug in random flight. With Num of Integrals at 2, its acceleration is changed randomly every frame. random - (White Noise) Every sample is random and unrelated to any other sample. It is the same as \"white noise\" in audio. alligator - Cell Noise.\n\t\t\n  seed - Any number, integer or non-integer, which starts the random number generator. Each number gives completely different noise patterns, but with similar characteristics.\n\n\n\t\t\n  period - The approximate separation between peaks of a noise cycle. It is expressed in Units. Increasing the period stretches the noise pattern out.\t\nPeriod is the opposite of frequency. If the period is 2 seconds, the base frequency is 0.5 cycles per second, or 0.5Hz for short. Hz refers to Hertz, the electrical and audio engineer of the 19th century, not the car guy.\nIf the Type is set to Random, setting this to zero will produce completely random noise. Otherwise, the period should be greater than zero.\n\n\n\t\t\n  periodunit - Select the units to use for this parameter, Samples, Frames, Seconds, or Fraction.\n\n\n\t\t\n  harmon - The number of higher frequency components to layer on top of the base frequency. The higher this number, the bumpier the noise will be (as long as roughness is not set to zero). 0 harmonics give the base shape.\t\nHarmonics with a base frequency of 0.1Hz will by default produce harmonics at 0.2Hz, 0.4Hz, 0.8Hz, etc. (up to the number of harmonics specified by the Harmonics parameter).\n\n\n\t\t\n  spread - The factor by which the frequency of the harmonics are increased. It is normally 2. A spread of 3 and a base frequency of 0.1Hz will produce harmonics at 0.3Hz, 0.9Hz, 2.7Hz, etc. This parameter is only valid for the Harmonic Summation type.\n\n\n\t\t\n  rough - Controls the effect of the higher frequency noise. When roughness is zero, all harmonics above the base frequency have no effect. At one, all harmonics are equal in amplitude to the base frequency. When roughness is between one and zero, the amplitude of higher harmonics drops off exponentially from the base frequency.\t\nThe default roughness is 0.5. This means the amplitude of the first harmonic is 0.5 of the base frequency, the second is 0.25, the third is 0.125. The harmonics are added to the base to give the final shape. The Harmonics parameter and the Roughness parameter must both be non-zero to see the harmonic effects.\n\n\n\t\t\n  exp - Pushes the noise values toward 0, or +1 and -1. (It raises the value to the power of the exponent.) Exponents greater than one will pull the channel toward zero, and powers less than one will pull peaks towards +1 and -1. It is used to reshape the channels.\n\n\n\t\t\n  numint - Defines the number of times to integrate (see the Area  p. 114) the Brownian noise. Higher values produce smoother curves with fewer features. Values beyond 4 produce somewhat identical curves. This parameter is only valid for the Random noise type.\n\n\n\t\t\n  amp - Defines the noise value's amplitude (a scale on the values output).\n\n\n\t\t\n  reset - Only available if operator's  Parameter is on. Toggling this parameter will reset the noise calculation and hold the value until the parameter is released again.\n\n\n\t\t\n  resetpulse - Only available if operator's  Parameter is on. Pulsing this parameter will reset the noise calculation.\n\n\n\n\n\nThe Translate, Rotate, Scale and Pivot parameters let you sample in a different part of the 3D noise space. Imagine a different noise value for every XYZ point in space. Normally, the Noise  samples the noise space from (0,0,0) along the X-axis in steps of 2/period. /tx /ty /tz /rx /ry /rx /sx /sy /sz /px /py /pz\t\t\n\nBy changing the transform, you are translating, rotating and scaling the line along which the Noise CHOPs samples the noise space. A slight Y-rotation is like walking in a straight path in the mountains, recording your altitude along the way, then re-starting from the same initial location, walking in a slightly different direction. Your altitude starts off being similar but then diverges.  xord -  - Changing the Transform Order will change where things go much the same way as going a block and turning east gets you to a different place than turning east and then going a block. In matrix math terms, if we use the 'multiply vector on the right' (column vector) convention, a transform order of Scale, Rotate, Translate would be written as T * R * S * Position\n\n srt - str - rst - rts - tsr - trs -\n\t\t\n  rord -  - As with transform order (above), changing the order in which the rotations take place will alter the final position and orientation. A Rotation order of Rx Ry Rz would create the final rotation matrix as follows R = Rz * Ry * Rx\n\n xyz - xzy - yxz - yzx - zxy - zyx -\n\t\t\n  t -  - XYZ translation values.\n\n tx - ty - tz -\n\t\t\n  r -  - XYZ rotation, in degrees.\n\n rx - ry - rz -\n\t\t\n  s -  - XYZ scale to shrink or enlarge the transform.\n\n sx - sy - sz -\n\t\t\n  p -  - XYZ pivot to apply the above operations around.\n\n px - py - pz -\n\n\n\n  constraint -  - Constraint and its parameters allows the noise curve to start and/or end at selected values. The mean value may also be enforced. Note: This only works when  is Off because time slicing has no pre-determined start/end.\n\n none - No constraints set. start - Sets the noise starting position to the value set in 'Starting Value' parameter below. end - Sets the noise ending position to the value set in 'Ending Value' parameter below. offset - Sets the noise mean position to the value set in the 'Mean Value' parameter below. endpoints - Set the starting and ending position of the noise separately using the parameters below.\n\t\t\n  constrstart - Value for the starting position.\n\n\n\t\t\n  constrend - Value for the ending position.\n\n\n\t\t\n  constrmean - Value for the mean value of the noise.\n\n\n\t\t\n  normal - Ensures that all noise curves fall between -1 and 1. Applied before the Amplitude parameter. Only valid for Random and Harmonic Summation noise types, since Hermite and Sparse noise are always normalized. Normalizing random noise occurs between integrations, producing a more controlled curve. Note: This only works when  is Off because time slicing has no pre-determined start/end.\n\n\n\n\n\n  channelname - You can creates many channels with simple patterns like \"chan[1-20]\", which generates 20 channels from chan1 to chan20. See the section, Common  Parameters for a description of this and all Options. See Scope and Channel Name Matching Options. Each channel has a unique seed, so all channels will be different with the same parameter settings.\n\n\n\t\t\n  start - Start of the interval, expressed in Units (seconds, frames or samples).\n\n\n\t\t\n  startunit - Select the units to use for this parameter, Samples, Frames, or Seconds.\n\n\n\t\t\n  end - End of the interval, expressed in Units (seconds, frames or samples).\n\n\n\t\t\n  endunit - Select the units to use for this parameter, Samples, Frames, or Seconds.\n\n\n\t\t\n  rate - The sample rate of the channels, in samples per second. Default: \n\n\n\t\t\n  left -  - The left extend conditions (before/after range).\n\n hold - Hold the current value of the channel. slope - Continue the slope before the start of the channel. cycle - Cycle the channel repeatedly. mirror - Cycle the channel repeatedly, mirroring every other cycle. default - Use the constant value specified in the Default Value parameter.\n\t\t\n  right -  - The right extend conditions (before/after range).\n\n hold - Hold the current value of the channel. slope - Continue the slope after the end of the channel. cycle - Cycle the channel repeatedly. mirror - Cycle the channel repeatedly, mirroring every other cycle. default - Use the constant value specified in the Default Value parameter.\n\t\t\n  defval - The value used for the Default Value extend condition.\n\n\n\n\n\n  timeslice - Turning this on forces the channels to be \"Time Sliced\".  A  is the time between the last cook frame and the current cook frame.\n\n\n\n  scope - To determine which channels get affected, some CHOPs use a  string on the Common page.\n\n\n\n  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.\n\n first - Use rate of first input to resample others. max - Resample to the highest sample rate. min - Resample to the lowest sample rate. err - Doesn't accept conflicting sample rates.\n\n  exportmethod -  - This will determine how to connect the  channel to the parameter. Refer to the Export article for more information.\n\n datindex - Uses the docked  table and references the channel via the index of the channel in the . datname - Uses the docked  table and references the channel via the name of the channel in the . autoname - The channel is the full destination of where to export to, such has geo1/transform1:tx.\n\n  autoexportroot - This path points to the root node where all of the paths that exporting by Channel Name is : are relative to.\n\n\n\n  exporttable - The  used to hold the export information when using the  Table  Methods (See above).\n\n\n\n\n\n -\n\nExtra Information for the Noise  can be accessed via an Info CHOP.\n\n\n\n - Start of the  interval in samples. - Number of samples in the . - The samplerate of the channels in frames per second. - Number of channels in the . - 1 if  is  enabled, 0 otherwise. - A count of how often the export connections have been updated.\n - Number of times the operator has cooked since the process started. - Duration of the last cook in milliseconds. - Frame number when this operator was last cooked relative to the component timeline. - Frame number when this operator was last cooked relative to the absolute time. - Time in milliseconds at which the operator started cooking in the frame it was cooked. - Time in milliseconds at which the operator finished cooking in the frame it was cooked. - 1 if operator was cooked this frame. - Number of warnings in this operator if any. - Number of errors in this operator if any.\nTouchDesigner Build: Latest\\n2021.100002018.28070before 2018.28070\nCHOPs\n• • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • \n\nAn 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.\n\n\n\nA 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.\n\n\n\nTo \"pulse\" a parameter is to send it a signal from (1) an exported CHOP channel or (2) a python command or (3) a mouse click that causes a new action to occur immediately. A pulse via python is via the .pulse() function on a pulse-type parameter, such as Reset parameter in a Speed CHOP. A pulse from a CHOP is typically a 0 to 1 to 0 signal in an exported channel.\n\n\n\nsamples-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.\n\n\n\nA 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.\n\n\n\nExporting 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.\n\n\n\nAn 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.\n\n\n\nThe 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.\n\n\n\nEvery 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.\n\n\n\nTouchDesigner 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.\n\n\n\n\n\n\n\n\nRetrieved from \"https://docs.derivative.ca/index.php?title=Noise_CHOP&oldid=24067\"\n\t\tCategory: CHOPs",
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      "description": "The Noise  makes an irregular wave that never repeats, with values approximately in the range -1 to +1.\t\t\nIt generates both smooth curves and noise that is random each sample. It uses the same math as the Noise SOP.\t\t\t\nYou can create several curves with different shapes, and you can adjust period, amplitude, harmonics and more.\t\t\t\nOptionally, an input can be connected. It is assumed that the input contains 1 to 3 channels representing X, Y and Z coordinates of points in space, and are used to sample anywhere in 3D noise space. One index in the input produces one sample in the output.\t\t\t\nAll noise functions work identically with Time Slicing on and off, with the exception of Harmonic Summation and Brownian whose methods cannot be limited to 1 in  mode. When the Timeline wraps around to frame 1, the noise functions will continue uninterrupted.\nnoiseCHOP_Class\n\nContents\n \n \n \n \n \n \n \n \n \n \n\n\n\n\n\n  type -  - The noise function used to generate noise. The functions available are:\n\n sparse - Produces high quality, continuous noise based on Sparse Convolution. hermite - Quicker than Sparse, but produces lower quality noise. harmonic - Sparse noise with the ability to control the frequency step of the harmonics. Slowest type. brownian - Works like a bug in random flight. With Num of Integrals at 2, its acceleration is changed randomly every frame. random - (White Noise) Every sample is random and unrelated to any other sample. It is the same as \"white noise\" in audio. alligator - Cell Noise.\n\t\t\n  seed - Any number, integer or non-integer, which starts the random number generator. Each number gives completely different noise patterns, but with similar characteristics.\n\n\n\t\t\n  period - The approximate separation between peaks of a noise cycle. It is expressed in Units. Increasing the period stretches the noise pattern out.\t\nPeriod is the opposite of frequency. If the period is 2 seconds, the base frequency is 0.5 cycles per second, or 0.5Hz for short. Hz refers to Hertz, the electrical and audio engineer of the 19th century, not the car guy.\nIf the Type is set to Random, setting this to zero will produce completely random noise. Otherwise, the period should be greater than zero.\n\n\n\t\t\n  periodunit - Select the units to use for this parameter, Samples, Frames, Seconds, or Fraction.\n\n\n\t\t\n  harmon - The number of higher frequency components to layer on top of the base frequency. The higher this number, the bumpier the noise will be (as long as roughness is not set to zero). 0 harmonics give the base shape.\t\nHarmonics with a base frequency of 0.1Hz will by default produce harmonics at 0.2Hz, 0.4Hz, 0.8Hz, etc. (up to the number of harmonics specified by the Harmonics parameter).\n\n\n\t\t\n  spread - The factor by which the frequency of the harmonics are increased. It is normally 2. A spread of 3 and a base frequency of 0.1Hz will produce harmonics at 0.3Hz, 0.9Hz, 2.7Hz, etc. This parameter is only valid for the Harmonic Summation type.\n\n\n\t\t\n  rough - Controls the effect of the higher frequency noise. When roughness is zero, all harmonics above the base frequency have no effect. At one, all harmonics are equal in amplitude to the base frequency. When roughness is between one and zero, the amplitude of higher harmonics drops off exponentially from the base frequency.\t\nThe default roughness is 0.5. This means the amplitude of the first harmonic is 0.5 of the base frequency, the second is 0.25, the third is 0.125. The harmonics are added to the base to give the final shape. The Harmonics parameter and the Roughness parameter must both be non-zero to see the harmonic effects.\n\n\n\t\t\n  exp - Pushes the noise values toward 0, or +1 and -1. (It raises the value to the power of the exponent.) Exponents greater than one will pull the channel toward zero, and powers less than one will pull peaks towards +1 and -1. It is used to reshape the channels.\n\n\n\t\t\n  numint - Defines the number of times to integrate (see the Area  p. 114) the Brownian noise. Higher values produce smoother curves with fewer features. Values beyond 4 produce somewhat identical curves. This parameter is only valid for the Random noise type.\n\n\n\t\t\n  amp - Defines the noise value's amplitude (a scale on the values output).\n\n\n\t\t\n  reset - Only available if operator's  Parameter is on. Toggling this parameter will reset the noise calculation and hold the value until the parameter is released again.\n\n\n\t\t\n  resetpulse - Only available if operator's  Parameter is on. Pulsing this parameter will reset the noise calculation.\n\n\n\n\n\nThe Translate, Rotate, Scale and Pivot parameters let you sample in a different part of the 3D noise space. Imagine a different noise value for every XYZ point in space. Normally, the Noise  samples the noise space from (0,0,0) along the X-axis in steps of 2/period. /tx /ty /tz /rx /ry /rx /sx /sy /sz /px /py /pz\t\t\n\nBy changing the transform, you are translating, rotating and scaling the line along which the Noise CHOPs samples the noise space. A slight Y-rotation is like walking in a straight path in the mountains, recording your altitude along the way, then re-starting from the same initial location, walking in a slightly different direction. Your altitude starts off being similar but then diverges.  xord -  - Changing the Transform Order will change where things go much the same way as going a block and turning east gets you to a different place than turning east and then going a block. In matrix math terms, if we use the 'multiply vector on the right' (column vector) convention, a transform order of Scale, Rotate, Translate would be written as T * R * S * Position\n\n srt - str - rst - rts - tsr - trs -\n\t\t\n  rord -  - As with transform order (above), changing the order in which the rotations take place will alter the final position and orientation. A Rotation order of Rx Ry Rz would create the final rotation matrix as follows R = Rz * Ry * Rx\n\n xyz - xzy - yxz - yzx - zxy - zyx -\n\t\t\n  t -  - XYZ translation values.\n\n tx - ty - tz -\n\t\t\n  r -  - XYZ rotation, in degrees.\n\n rx - ry - rz -\n\t\t\n  s -  - XYZ scale to shrink or enlarge the transform.\n\n sx - sy - sz -\n\t\t\n  p -  - XYZ pivot to apply the above operations around.\n\n px - py - pz -\n\n\n\n  constraint -  - Constraint and its parameters allows the noise curve to start and/or end at selected values. The mean value may also be enforced. Note: This only works when  is Off because time slicing has no pre-determined start/end.\n\n none - No constraints set. start - Sets the noise starting position to the value set in 'Starting Value' parameter below. end - Sets the noise ending position to the value set in 'Ending Value' parameter below. offset - Sets the noise mean position to the value set in the 'Mean Value' parameter below. endpoints - Set the starting and ending position of the noise separately using the parameters below.\n\t\t\n  constrstart - Value for the starting position.\n\n\n\t\t\n  constrend - Value for the ending position.\n\n\n\t\t\n  constrmean - Value for the mean value of the noise.\n\n\n\t\t\n  normal - Ensures that all noise curves fall between -1 and 1. Applied before the Amplitude parameter. Only valid for Random and Harmonic Summation noise types, since Hermite and Sparse noise are always normalized. Normalizing random noise occurs between integrations, producing a more controlled curve. Note: This only works when  is Off because time slicing has no pre-determined start/end.\n\n\n\n\n\n  channelname - You can creates many channels with simple patterns like \"chan[1-20]\", which generates 20 channels from chan1 to chan20. See the section, Common  Parameters for a description of this and all Options. See Scope and Channel Name Matching Options. Each channel has a unique seed, so all channels will be different with the same parameter settings.\n\n\n\t\t\n  start - Start of the interval, expressed in Units (seconds, frames or samples).\n\n\n\t\t\n  startunit - Select the units to use for this parameter, Samples, Frames, or Seconds.\n\n\n\t\t\n  end - End of the interval, expressed in Units (seconds, frames or samples).\n\n\n\t\t\n  endunit - Select the units to use for this parameter, Samples, Frames, or Seconds.\n\n\n\t\t\n  rate - The sample rate of the channels, in samples per second. Default: \n\n\n\t\t\n  left -  - The left extend conditions (before/after range).\n\n hold - Hold the current value of the channel. slope - Continue the slope before the start of the channel. cycle - Cycle the channel repeatedly. mirror - Cycle the channel repeatedly, mirroring every other cycle. default - Use the constant value specified in the Default Value parameter.\n\t\t\n  right -  - The right extend conditions (before/after range).\n\n hold - Hold the current value of the channel. slope - Continue the slope after the end of the channel. cycle - Cycle the channel repeatedly. mirror - Cycle the channel repeatedly, mirroring every other cycle. default - Use the constant value specified in the Default Value parameter.\n\t\t\n  defval - The value used for the Default Value extend condition.\n\n\n\n\n\n  timeslice - Turning this on forces the channels to be \"Time Sliced\".  A  is the time between the last cook frame and the current cook frame.\n\n\n\n  scope - To determine which channels get affected, some CHOPs use a  string on the Common page.\n\n\n\n  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.\n\n first - Use rate of first input to resample others. max - Resample to the highest sample rate. min - Resample to the lowest sample rate. err - Doesn't accept conflicting sample rates.\n\n  exportmethod -  - This will determine how to connect the  channel to the parameter. Refer to the Export article for more information.\n\n datindex - Uses the docked  table and references the channel via the index of the channel in the . datname - Uses the docked  table and references the channel via the name of the channel in the . autoname - The channel is the full destination of where to export to, such has geo1/transform1:tx.\n\n  autoexportroot - This path points to the root node where all of the paths that exporting by Channel Name is : are relative to.\n\n\n\n  exporttable - The  used to hold the export information when using the  Table  Methods (See above).\n\n\n\n\n\n -\n\nExtra Information for the Noise  can be accessed via an Info CHOP.\n\n\n\n - Start of the  interval in samples. - Number of samples in the . - The samplerate of the channels in frames per second. - Number of channels in the . - 1 if  is  enabled, 0 otherwise. - A count of how often the export connections have been updated.\n - Number of times the operator has cooked since the process started. - Duration of the last cook in milliseconds. - Frame number when this operator was last cooked relative to the component timeline. - Frame number when this operator was last cooked relative to the absolute time. - Time in milliseconds at which the operator started cooking in the frame it was cooked. - Time in milliseconds at which the operator finished cooking in the frame it was cooked. - 1 if operator was cooked this frame. - Number of warnings in this operator if any. - Number of errors in this operator if any.\nTouchDesigner Build: Latest\\n2021.100002018.28070before 2018.28070\nCHOPs\n• • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • \n\nAn 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.\n\n\n\nA 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.\n\n\n\nTo \"pulse\" a parameter is to send it a signal from (1) an exported CHOP channel or (2) a python command or (3) a mouse click that causes a new action to occur immediately. A pulse via python is via the .pulse() function on a pulse-type parameter, such as Reset parameter in a Speed CHOP. A pulse from a CHOP is typically a 0 to 1 to 0 signal in an exported channel.\n\n\n\nsamples-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.\n\n\n\nA 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.\n\n\n\nExporting 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.\n\n\n\nAn 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.\n\n\n\nThe 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.\n\n\n\nEvery 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.\n\n\n\nTouchDesigner 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.\n\n\n\n\n\n\n\n\nRetrieved from \"https://docs.derivative.ca/index.php?title=Noise_CHOP&oldid=24067\"",
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      "description": "type -  - The noise function used to generate noise. The functions available are:\n\n sparse - Produces high quality, continuous noise based on Sparse Convolution. hermite - Quicker than Sparse, but produces lower quality noise. harmonic - Sparse noise with the ability to control the frequency step of the harmonics. Slowest type. brownian - Works like a bug in random flight. With Num of Integrals at 2, its acceleration is changed randomly every frame. random - (White Noise) Every sample is random and unrelated to any other sample. It is the same as \"white noise\" in audio. alligator - Cell Noise.",
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      "description": "sparse - Produces high quality, continuous noise based on Sparse Convolution. hermite - Quicker than Sparse, but produces lower quality noise. harmonic - Sparse noise with the ability to control the frequency step of the harmonics. Slowest type. brownian - Works like a bug in random flight. With Num of Integrals at 2, its acceleration is changed randomly every frame. random - (White Noise) Every sample is random and unrelated to any other sample. It is the same as \"white noise\" in audio. alligator - Cell Noise.",
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      "description": "period - The approximate separation between peaks of a noise cycle. It is expressed in Units. Increasing the period stretches the noise pattern out.\t\nPeriod is the opposite of frequency. If the period is 2 seconds, the base frequency is 0.5 cycles per second, or 0.5Hz for short. Hz refers to Hertz, the electrical and audio engineer of the 19th century, not the car guy.\nIf the Type is set to Random, setting this to zero will produce completely random noise. Otherwise, the period should be greater than zero.",
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      "name": "Period Unit",
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      "description": "periodunit - Select the units to use for this parameter, Samples, Frames, Seconds, or Fraction.",
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      "name": "Harmonics",
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      "description": "harmon - The number of higher frequency components to layer on top of the base frequency. The higher this number, the bumpier the noise will be (as long as roughness is not set to zero). 0 harmonics give the base shape.\t\nHarmonics with a base frequency of 0.1Hz will by default produce harmonics at 0.2Hz, 0.4Hz, 0.8Hz, etc. (up to the number of harmonics specified by the Harmonics parameter).",
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      "description": "spread - The factor by which the frequency of the harmonics are increased. It is normally 2. A spread of 3 and a base frequency of 0.1Hz will produce harmonics at 0.3Hz, 0.9Hz, 2.7Hz, etc. This parameter is only valid for the Harmonic Summation type.",
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      "name": "Roughness",
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      "description": "rough - Controls the effect of the higher frequency noise. When roughness is zero, all harmonics above the base frequency have no effect. At one, all harmonics are equal in amplitude to the base frequency. When roughness is between one and zero, the amplitude of higher harmonics drops off exponentially from the base frequency.\t\nThe default roughness is 0.5. This means the amplitude of the first harmonic is 0.5 of the base frequency, the second is 0.25, the third is 0.125. The harmonics are added to the base to give the final shape. The Harmonics parameter and the Roughness parameter must both be non-zero to see the harmonic effects.",
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      "name": "Exponent",
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      "description": "exp - Pushes the noise values toward 0, or +1 and -1. (It raises the value to the power of the exponent.) Exponents greater than one will pull the channel toward zero, and powers less than one will pull peaks towards +1 and -1. It is used to reshape the channels.",
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      "name": "Num of Integrals",
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      "description": "numint - Defines the number of times to integrate (see the Area  p. 114) the Brownian noise. Higher values produce smoother curves with fewer features. Values beyond 4 produce somewhat identical curves. This parameter is only valid for the Random noise type.",
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      "name": "Amplitude",
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      "description": "amp - Defines the noise value's amplitude (a scale on the values output).",
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      "name": "Reset",
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      "description": "reset - Only available if operator's  Parameter is on. Toggling this parameter will reset the noise calculation and hold the value until the parameter is released again.",
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      "name": "Reset Pulse",
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      "description": "resetpulse - Only available if operator's  Parameter is on. Pulsing this parameter will reset the noise calculation.",
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      "name": "Transform Order",
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      "description": "xord -  - Changing the Transform Order will change where things go much the same way as going a block and turning east gets you to a different place than turning east and then going a block. In matrix math terms, if we use the 'multiply vector on the right' (column vector) convention, a transform order of Scale, Rotate, Translate would be written as T * R * S * Position\n\n srt - str - rst - rts - tsr - trs -",
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      "description": "rord -  - As with transform order (above), changing the order in which the rotations take place will alter the final position and orientation. A Rotation order of Rx Ry Rz would create the final rotation matrix as follows R = Rz * Ry * Rx\n\n xyz - xzy - yxz - yzx - zxy - zyx -",
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      "description": "xyz - xzy - yxz - yzx - zxy - zyx -",
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      "description": "t -  - XYZ translation values.\n\n tx - ty - tz -",
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      "description": "r -  - XYZ rotation, in degrees.\n\n rx - ry - rz -",
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      "description": "rx - ry - rz -",
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      "description": "constrend - Value for the ending position.",
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      "description": "hold - Hold the current value of the channel. slope - Continue the slope before the start of the channel. cycle - Cycle the channel repeatedly. mirror - Cycle the channel repeatedly, mirroring every other cycle. default - Use the constant value specified in the Default Value parameter.",
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      "description": "defval - The value used for the Default Value extend condition.",
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      "label": "Time Slice",
      "group": "General",
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      "description": "timeslice - Turning this on forces the channels to be \"Time Sliced\".  A  is the time between the last cook frame and the current cook frame.",
      "tooltip": "",
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      "isReadOnly": false,
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      "description": "scope - To determine which channels get affected, some CHOPs use a  string on the Common page.",
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      "label": "Sample Rate Match",
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      "description": "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.\n\n first - Use rate of first input to resample others. max - Resample to the highest sample rate. min - Resample to the lowest sample rate. err - Doesn't accept conflicting sample rates.",
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      "description": "autoexportroot - This path points to the root node where all of the paths that exporting by Channel Name is : are relative to.",
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      "description": "exporttable - The  used to hold the export information when using the  Table  Methods (See above).",
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