{
  "id": "top_to_chop",
  "name": "CHOP to",
  "displayName": "CHOP to",
  "category": "TOP",
  "subcategory": "Filters",
  "version": "",
  "lastUpdated": "2025-08-08T00:37:54.905Z",
  "sourceFile": "C:\\Program Files\\Derivative\\TouchDesigner\\Samples\\Learn\\OfflineHelp\\https.docs.derivative.ca\\TOP_to_CHOP.htm",
  "url": "",
  "description": "The TOP to CHOP converts pixels in a TOP image to CHOP channels. Each pixel color element (RGBA) is placed in a separate channel. Depending on the parameter options, the node will either create a single set of channels for the whole image or it can create a separate set of channels for each scanline (row).",
  "summary": "The TOP to CHOP converts pixels in a TOP image to CHOP channels. Each pixel color element (RGBA) is placed in a separate channel. Depending on the parameter options, the node will either create a sing",
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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  to  converts pixels in a TOP image to CHOP channels. Each pixel color element (RGBA) is placed in a separate channel. Depending on the parameter options, the node will either create a single set of channels for the whole image or it can create a separate set of channels for each scanline (row).\nA single pixel, rows of pixels, columns of pixels or rectangular regions can be extracted from the image. It is therefore important to be aware of how many pixels your source image is composed of.\nThe Exclude NaN and Active Mask parameters can be used to skip certain pixels so they are not included in the chop channels.\nThere is an optional input which supplies UV coordinates to sample the image. The input  must contain 2 channels, for U and V. The first channel is always assumed to be U. The channels produced (red, green, blue and alpha) will be exactly as long as the input channel's length, with a value for each UV coordinate.\t\t\t\nIf you are grabbing pixels from a Depth TOP, you will only get a single channel (the depth). This will be placed in the R channel.\ntoptoCHOP_Class\n\nContents\n \n \n \n \n \n \n \n\n\n\n\n  top - Specify the  operator whose image will be sampled.\n\n\n\n  downloadtype -  - Gives the option for a delayed data download from the , which is much faster and does not stall the render.\n\n immediate - nextframe -\n\n  r - The prefix for channels created from the red pixels of the source image. If multiple red channels are created, they will have a numeric suffix that matches the vertical scanline number of the image e.g. r0 - r4.\n\n\n\n  g - The prefix for channels created from the green pixels of the source image. If multiple green channels are created, they will have a numeric suffix that matches the scanline number of the image e.g. g0 - g4.\n\n\n\n  b - The prefix for channels created from the blue pixels of the source image. If multiple blue channels are created, they will have a numeric suffix that matches the scanline number of the image e.g. b0 - b4.\n\n\n\n  a - The prefix for channels created from the alpha pixels of the source image. If multiple alpha channels are created, they will have a numeric suffix that matches the scanline number of the image e.g. a0 - a4.\n\n\n\n  singleset - Controls whether a channel is created for each scanline, or whether all scanlines are appended into a single channel set. A channel set refers to one  channel per color channel of the source image e.g. 4 channels for an RGBA image.\n\n\n\n  excludenans - When enabled, pixels that have a NaN value in any of their channels will be skipped and not added to the  channel.\n\n\n\n  activechannel -  - When enabled, only pixels that have a non-zero value in the selected active channel will be added to the  channel.\n\n none - red - green - blue - alpha -\n\n  rgbaunit -  - Scales the output to lie in the range 0-1, 0-255 or 0-65535.\n\n u1 - u256 - u65536 -\n\n\n\n  crop -  - Specifies what to extract from the image.\n\n pixel - Extract a single pixel at the given U and V value. row - Extract a single row at the given U value, cropped by the V Start and V End on the left and right. col - Extract a single column at the given V value, cropped by the U Start and U End on the bottom and top. block - Extract multiple rows and multiple columns, bound by the U/V Start/End parameters. full - Extract the full image.\n\n  uvunits -  - Specifies the units for the following 4 parameters. The parameters can use the local variables $NR and $NC for the number of rows and columns.\n\n norm - pixel -\n\n  ustart - Starting point for sampling in U. Values outside the range of the image are determined by the image's extend conditions, in the extend page.\n\n\n\n  uend - Ending point for sampling in U.\n\n\n\n  vstart - Starting point for sampling in V.\n\n\n\n  vend - Ending point for sampling in V.\n\n\n\n  interp -  - Determines the interpolation method when UV sampling with an input .\n\n nearest - linear -\n\n\n\n  imageleft -  - The image extend conditions when sampling the image with U less than 0.\n\n hold - cycle - mirror - default -\n\n  imageright -  - The image extend conditions for U greater than 1.\n\n hold - cycle - mirror - default -\n\n  imagebottom -  - The image extend conditions for V less than 0.\n\n hold - cycle - mirror - default -\n\n  imagetop -  - The image extend conditions for V greater than 1.\t\nThe extend conditions are:\n\n\n hold - Use the first or last pixel value. cycle - Loop back to the other side of the image. mirror - Zig-zag back into the image. default - Use a default color specified below.\n\n  defcolor -  - The color to use when outside the bounds of the image, and the Default Color extend condition is set.\n\n defcolorr - defcolorg - defcolorb - defcolora -\n\n\n\n  start - The start position of the channel, expressed in units set by the units menu to the right (samples, frames or seconds). The channel length is determined by the number of pixels in each scanline that is converted into a channel.\n\n\n\n  startunit -  - Select the units to use for this parameter, Samples, Frames, or Seconds.\n\n samples - frames - seconds -\n\n  rate - The sample rate of the channels, in samples per second.\n\n\n\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\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\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 -TouchDesigner Build: Latest\\nwikieditor2021.100002018.28070before 2018.28070\nCHOPs\n• • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • \n\nAn Operator Family that creates, composites and modifies images, and reads/writes images and movies to/from files and the network. TOPs run on the graphics card's GPU.\n\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\nThe Graphics Processing Unit. This is the high-speed, many-core processor of the graphics card/chip that takes geometry, images and data from the CPU and creates images and processed data.\n\n\n\nA CHOP outputs one or more channels, where a channel is simply a sequence of numbers (Samples), representing motion, audio, etc. Channels are passed between CHOPs in TouchDesigner networks. Channels can be Exported to Parameters.\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\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 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\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 /. 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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  to  converts pixels in a TOP image to CHOP channels. Each pixel color element (RGBA) is placed in a separate channel. Depending on the parameter options, the node will either create a single set of channels for the whole image or it can create a separate set of channels for each scanline (row).\nA single pixel, rows of pixels, columns of pixels or rectangular regions can be extracted from the image. It is therefore important to be aware of how many pixels your source image is composed of.\nThe Exclude NaN and Active Mask parameters can be used to skip certain pixels so they are not included in the chop channels.\nThere is an optional input which supplies UV coordinates to sample the image. The input  must contain 2 channels, for U and V. The first channel is always assumed to be U. The channels produced (red, green, blue and alpha) will be exactly as long as the input channel's length, with a value for each UV coordinate.\t\t\t\nIf you are grabbing pixels from a Depth TOP, you will only get a single channel (the depth). This will be placed in the R channel.\ntoptoCHOP_Class\n\nContents\n \n \n \n \n \n \n \n\n\n\n\n  top - Specify the  operator whose image will be sampled.\n\n\n\n  downloadtype -  - Gives the option for a delayed data download from the , which is much faster and does not stall the render.\n\n immediate - nextframe -\n\n  r - The prefix for channels created from the red pixels of the source image. If multiple red channels are created, they will have a numeric suffix that matches the vertical scanline number of the image e.g. r0 - r4.\n\n\n\n  g - The prefix for channels created from the green pixels of the source image. If multiple green channels are created, they will have a numeric suffix that matches the scanline number of the image e.g. g0 - g4.\n\n\n\n  b - The prefix for channels created from the blue pixels of the source image. If multiple blue channels are created, they will have a numeric suffix that matches the scanline number of the image e.g. b0 - b4.\n\n\n\n  a - The prefix for channels created from the alpha pixels of the source image. If multiple alpha channels are created, they will have a numeric suffix that matches the scanline number of the image e.g. a0 - a4.\n\n\n\n  singleset - Controls whether a channel is created for each scanline, or whether all scanlines are appended into a single channel set. A channel set refers to one  channel per color channel of the source image e.g. 4 channels for an RGBA image.\n\n\n\n  excludenans - When enabled, pixels that have a NaN value in any of their channels will be skipped and not added to the  channel.\n\n\n\n  activechannel -  - When enabled, only pixels that have a non-zero value in the selected active channel will be added to the  channel.\n\n none - red - green - blue - alpha -\n\n  rgbaunit -  - Scales the output to lie in the range 0-1, 0-255 or 0-65535.\n\n u1 - u256 - u65536 -\n\n\n\n  crop -  - Specifies what to extract from the image.\n\n pixel - Extract a single pixel at the given U and V value. row - Extract a single row at the given U value, cropped by the V Start and V End on the left and right. col - Extract a single column at the given V value, cropped by the U Start and U End on the bottom and top. block - Extract multiple rows and multiple columns, bound by the U/V Start/End parameters. full - Extract the full image.\n\n  uvunits -  - Specifies the units for the following 4 parameters. The parameters can use the local variables $NR and $NC for the number of rows and columns.\n\n norm - pixel -\n\n  ustart - Starting point for sampling in U. Values outside the range of the image are determined by the image's extend conditions, in the extend page.\n\n\n\n  uend - Ending point for sampling in U.\n\n\n\n  vstart - Starting point for sampling in V.\n\n\n\n  vend - Ending point for sampling in V.\n\n\n\n  interp -  - Determines the interpolation method when UV sampling with an input .\n\n nearest - linear -\n\n\n\n  imageleft -  - The image extend conditions when sampling the image with U less than 0.\n\n hold - cycle - mirror - default -\n\n  imageright -  - The image extend conditions for U greater than 1.\n\n hold - cycle - mirror - default -\n\n  imagebottom -  - The image extend conditions for V less than 0.\n\n hold - cycle - mirror - default -\n\n  imagetop -  - The image extend conditions for V greater than 1.\t\nThe extend conditions are:\n\n\n hold - Use the first or last pixel value. cycle - Loop back to the other side of the image. mirror - Zig-zag back into the image. default - Use a default color specified below.\n\n  defcolor -  - The color to use when outside the bounds of the image, and the Default Color extend condition is set.\n\n defcolorr - defcolorg - defcolorb - defcolora -\n\n\n\n  start - The start position of the channel, expressed in units set by the units menu to the right (samples, frames or seconds). The channel length is determined by the number of pixels in each scanline that is converted into a channel.\n\n\n\n  startunit -  - Select the units to use for this parameter, Samples, Frames, or Seconds.\n\n samples - frames - seconds -\n\n  rate - The sample rate of the channels, in samples per second.\n\n\n\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\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\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 -TouchDesigner Build: Latest\\nwikieditor2021.100002018.28070before 2018.28070\nCHOPs\n• • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • \n\nAn Operator Family that creates, composites and modifies images, and reads/writes images and movies to/from files and the network. TOPs run on the graphics card's GPU.\n\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\nThe Graphics Processing Unit. This is the high-speed, many-core processor of the graphics card/chip that takes geometry, images and data from the CPU and creates images and processed data.\n\n\n\nA CHOP outputs one or more channels, where a channel is simply a sequence of numbers (Samples), representing motion, audio, etc. Channels are passed between CHOPs in TouchDesigner networks. Channels can be Exported to Parameters.\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\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 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\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 /. 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      "description": "The  to  converts pixels in a TOP image to CHOP channels. Each pixel color element (RGBA) is placed in a separate channel. Depending on the parameter options, the node will either create a single set of channels for the whole image or it can create a separate set of channels for each scanline (row).\nA single pixel, rows of pixels, columns of pixels or rectangular regions can be extracted from the image. It is therefore important to be aware of how many pixels your source image is composed of.\nThe Exclude NaN and Active Mask parameters can be used to skip certain pixels so they are not included in the chop channels.\nThere is an optional input which supplies UV coordinates to sample the image. The input  must contain 2 channels, for U and V. The first channel is always assumed to be U. The channels produced (red, green, blue and alpha) will be exactly as long as the input channel's length, with a value for each UV coordinate.\t\t\t\nIf you are grabbing pixels from a Depth TOP, you will only get a single channel (the depth). This will be placed in the R channel.\ntoptoCHOP_Class\n\nContents\n \n \n \n \n \n \n \n\n\n\n\n  top - Specify the  operator whose image will be sampled.\n\n\n\n  downloadtype -  - Gives the option for a delayed data download from the , which is much faster and does not stall the render.\n\n immediate - nextframe -\n\n  r - The prefix for channels created from the red pixels of the source image. If multiple red channels are created, they will have a numeric suffix that matches the vertical scanline number of the image e.g. r0 - r4.\n\n\n\n  g - The prefix for channels created from the green pixels of the source image. If multiple green channels are created, they will have a numeric suffix that matches the scanline number of the image e.g. g0 - g4.\n\n\n\n  b - The prefix for channels created from the blue pixels of the source image. If multiple blue channels are created, they will have a numeric suffix that matches the scanline number of the image e.g. b0 - b4.\n\n\n\n  a - The prefix for channels created from the alpha pixels of the source image. If multiple alpha channels are created, they will have a numeric suffix that matches the scanline number of the image e.g. a0 - a4.\n\n\n\n  singleset - Controls whether a channel is created for each scanline, or whether all scanlines are appended into a single channel set. A channel set refers to one  channel per color channel of the source image e.g. 4 channels for an RGBA image.\n\n\n\n  excludenans - When enabled, pixels that have a NaN value in any of their channels will be skipped and not added to the  channel.\n\n\n\n  activechannel -  - When enabled, only pixels that have a non-zero value in the selected active channel will be added to the  channel.\n\n none - red - green - blue - alpha -\n\n  rgbaunit -  - Scales the output to lie in the range 0-1, 0-255 or 0-65535.\n\n u1 - u256 - u65536 -\n\n\n\n  crop -  - Specifies what to extract from the image.\n\n pixel - Extract a single pixel at the given U and V value. row - Extract a single row at the given U value, cropped by the V Start and V End on the left and right. col - Extract a single column at the given V value, cropped by the U Start and U End on the bottom and top. block - Extract multiple rows and multiple columns, bound by the U/V Start/End parameters. full - Extract the full image.\n\n  uvunits -  - Specifies the units for the following 4 parameters. The parameters can use the local variables $NR and $NC for the number of rows and columns.\n\n norm - pixel -\n\n  ustart - Starting point for sampling in U. Values outside the range of the image are determined by the image's extend conditions, in the extend page.\n\n\n\n  uend - Ending point for sampling in U.\n\n\n\n  vstart - Starting point for sampling in V.\n\n\n\n  vend - Ending point for sampling in V.\n\n\n\n  interp -  - Determines the interpolation method when UV sampling with an input .\n\n nearest - linear -\n\n\n\n  imageleft -  - The image extend conditions when sampling the image with U less than 0.\n\n hold - cycle - mirror - default -\n\n  imageright -  - The image extend conditions for U greater than 1.\n\n hold - cycle - mirror - default -\n\n  imagebottom -  - The image extend conditions for V less than 0.\n\n hold - cycle - mirror - default -\n\n  imagetop -  - The image extend conditions for V greater than 1.\t\nThe extend conditions are:\n\n\n hold - Use the first or last pixel value. cycle - Loop back to the other side of the image. mirror - Zig-zag back into the image. default - Use a default color specified below.\n\n  defcolor -  - The color to use when outside the bounds of the image, and the Default Color extend condition is set.\n\n defcolorr - defcolorg - defcolorb - defcolora -\n\n\n\n  start - The start position of the channel, expressed in units set by the units menu to the right (samples, frames or seconds). The channel length is determined by the number of pixels in each scanline that is converted into a channel.\n\n\n\n  startunit -  - Select the units to use for this parameter, Samples, Frames, or Seconds.\n\n samples - frames - seconds -\n\n  rate - The sample rate of the channels, in samples per second.\n\n\n\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\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\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 -TouchDesigner Build: Latest\\nwikieditor2021.100002018.28070before 2018.28070\nCHOPs\n• • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • \n\nAn Operator Family that creates, composites and modifies images, and reads/writes images and movies to/from files and the network. TOPs run on the graphics card's GPU.\n\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\nThe Graphics Processing Unit. This is the high-speed, many-core processor of the graphics card/chip that takes geometry, images and data from the CPU and creates images and processed data.\n\n\n\nA CHOP outputs one or more channels, where a channel is simply a sequence of numbers (Samples), representing motion, audio, etc. Channels are passed between CHOPs in TouchDesigner networks. Channels can be Exported to Parameters.\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\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 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\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=TOP_to_CHOP&oldid=30498\"",
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      "lastUpdated": "2025-08-08T00:37:54.900Z",
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      "id": null,
      "name": "RGBA Units",
      "label": "RGBA Units",
      "group": "General",
      "page": "",
      "type": "float",
      "dataType": "number",
      "style": "",
      "defaultValue": null,
      "minValue": null,
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      "maxLength": null,
      "pattern": null,
      "isArray": false,
      "arraySize": 1,
      "dimensions": 1,
      "description": "rgbaunit -  - Scales the output to lie in the range 0-1, 0-255 or 0-65535.\n\n u1 - u256 - u65536 -",
      "tooltip": "",
      "help": "",
      "units": "",
      "examples": [],
      "isReadOnly": false,
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      "isAnimatable": true,
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      "id": null,
      "name": "0 to 1",
      "label": "0 to 1",
      "group": "General",
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      "type": "float",
      "dataType": "number",
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      "defaultValue": null,
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      "arraySize": 1,
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      "description": "u1 - u256 - u65536 -",
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      "id": null,
      "name": "Crop",
      "label": "Crop",
      "group": "General",
      "page": "",
      "type": "float",
      "dataType": "number",
      "style": "",
      "defaultValue": null,
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      "maxLength": null,
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      "isArray": false,
      "arraySize": 1,
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      "description": "crop -  - Specifies what to extract from the image.\n\n pixel - Extract a single pixel at the given U and V value. row - Extract a single row at the given U value, cropped by the V Start and V End on the left and right. col - Extract a single column at the given V value, cropped by the U Start and U End on the bottom and top. block - Extract multiple rows and multiple columns, bound by the U/V Start/End parameters. full - Extract the full image.",
      "tooltip": "",
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      "isReadOnly": false,
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      "id": null,
      "name": "Pixel (U,V)",
      "label": "Pixel (U,V)",
      "group": "General",
      "page": "",
      "type": "float",
      "dataType": "number",
      "style": "",
      "defaultValue": null,
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      "arraySize": 1,
      "dimensions": 1,
      "description": "pixel - Extract a single pixel at the given U and V value. row - Extract a single row at the given U value, cropped by the V Start and V End on the left and right. col - Extract a single column at the given V value, cropped by the U Start and U End on the bottom and top. block - Extract multiple rows and multiple columns, bound by the U/V Start/End parameters. full - Extract the full image.",
      "tooltip": "",
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      "id": null,
      "name": "UV Units",
      "label": "UV Units",
      "group": "General",
      "page": "",
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      "dataType": "number",
      "style": "",
      "defaultValue": null,
      "minValue": null,
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      "maxLength": null,
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      "isArray": false,
      "arraySize": 1,
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      "description": "uvunits -  - Specifies the units for the following 4 parameters. The parameters can use the local variables $NR and $NC for the number of rows and columns.\n\n norm - pixel -",
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      "help": "",
      "units": "",
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      "isReadOnly": false,
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      "name": "0 to 1",
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      "description": "norm - pixel -",
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      "id": null,
      "name": "U Start",
      "label": "U Start",
      "group": "General",
      "page": "",
      "type": "float",
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      "defaultValue": null,
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      "arraySize": 1,
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      "description": "ustart - Starting point for sampling in U. Values outside the range of the image are determined by the image's extend conditions, in the extend page.",
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      "name": "U End",
      "label": "U End",
      "group": "General",
      "page": "",
      "type": "float",
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      "description": "uend - Ending point for sampling in U.",
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      "id": null,
      "name": "V Start",
      "label": "V Start",
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      "description": "vstart - Starting point for sampling in V.",
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      "name": "V End",
      "label": "V End",
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      "description": "vend - Ending point for sampling in V.",
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      "id": null,
      "name": "Interpolate",
      "label": "Interpolate",
      "group": "General",
      "page": "",
      "type": "float",
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      "defaultValue": null,
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      "arraySize": 1,
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      "description": "interp -  - Determines the interpolation method when UV sampling with an input .\n\n nearest - linear -",
      "tooltip": "",
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      "units": "",
      "examples": [],
      "isReadOnly": false,
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      "id": null,
      "name": "Nearest Sample",
      "label": "Nearest Sample",
      "group": "General",
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      "type": "float",
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      "defaultValue": null,
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      "id": null,
      "name": "Image Left",
      "label": "Image Left",
      "group": "General",
      "page": "",
      "type": "float",
      "dataType": "number",
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      "defaultValue": null,
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      "arraySize": 1,
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      "description": "imageleft -  - The image extend conditions when sampling the image with U less than 0.\n\n hold - cycle - mirror - default -",
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      "id": null,
      "name": "Hold",
      "label": "Hold",
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      "description": "hold - cycle - mirror - default -",
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      "name": "Image Right",
      "label": "Image Right",
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      "description": "imageright -  - The image extend conditions for U greater than 1.\n\n hold - cycle - mirror - default -",
      "tooltip": "",
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      "description": "imagebottom -  - The image extend conditions for V less than 0.\n\n hold - cycle - mirror - default -",
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      "description": "imagetop -  - The image extend conditions for V greater than 1.\t\nThe extend conditions are:\n\n\n hold - Use the first or last pixel value. cycle - Loop back to the other side of the image. mirror - Zig-zag back into the image. default - Use a default color specified below.",
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      "description": "hold - Use the first or last pixel value. cycle - Loop back to the other side of the image. mirror - Zig-zag back into the image. default - Use a default color specified below.",
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      "name": "Default Color",
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      "description": "defcolor -  - The color to use when outside the bounds of the image, and the Default Color extend condition is set.\n\n defcolorr - defcolorg - defcolorb - defcolora -",
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      "name": "Red",
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      "description": "defcolorr - defcolorg - defcolorb - defcolora -",
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      "id": null,
      "name": "Start",
      "label": "Start",
      "group": "General",
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      "type": "float",
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      "description": "start - The start position of the channel, expressed in units set by the units menu to the right (samples, frames or seconds). The channel length is determined by the number of pixels in each scanline that is converted into a channel.",
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      "name": "Start Unit",
      "label": "Start Unit",
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      "description": "startunit -  - Select the units to use for this parameter, Samples, Frames, or Seconds.\n\n samples - frames - seconds -",
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      "id": null,
      "name": "I",
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      "description": "samples - frames - seconds -",
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      "name": "Sample Rate",
      "label": "Sample Rate",
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      "description": "rate - The sample rate of the channels, in samples per second.",
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      "id": null,
      "name": "Extend Left",
      "label": "Extend Left",
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      "page": "",
      "type": "float",
      "dataType": "number",
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      "description": "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",
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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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      "name": "Extend Right",
      "label": "Extend Right",
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      "description": "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",
      "tooltip": "",
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      "id": null,
      "name": "Hold",
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      "description": "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",
      "tooltip": "",
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      "name": "Default Value",
      "label": "Default Value",
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      "description": "defval - The value used for the Default Value extend condition.",
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      "id": null,
      "name": "Time Slice",
      "label": "Time Slice",
      "group": "General",
      "page": "",
      "type": "float",
      "dataType": "number",
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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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      "id": null,
      "name": "Scope",
      "label": "Scope",
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      "type": "float",
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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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      "name": "Sample Rate Match",
      "label": "Sample Rate Match",
      "group": "General",
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      "type": "float",
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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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      "id": null,
      "name": "Resample At First Input's Rate",
      "label": "Resample At First Input's Rate",
      "group": "General",
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      "type": "float",
      "dataType": "number",
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      "description": "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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      "id": null,
      "name": "Export Method",
      "label": "Export Method",
      "group": "General",
      "page": "",
      "type": "float",
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      "description": "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.",
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    {
      "id": null,
      "name": "DAT Table by Index",
      "label": "DAT Table by Index",
      "group": "General",
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