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TouchDesigner Documentation MCP Server v2.3 - Pure MCP server for VS Code/Codium with comprehensive operator documentation for 629 operators + 7 tutorials across all categories (TOP, CHOP, SOP, DAT, MAT, COMP, POP). Features experimental POP operators wit
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{
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"name": "Null CHOP",
"displayName": "Null CHOP",
"category": "CHOP",
"subcategory": "Generators",
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"lastUpdated": "2025-08-07T07:50:04.903Z",
"sourceFile": "C:\\Program Files\\Derivative\\TouchDesigner\\Samples\\Learn\\OfflineHelp\\https.docs.derivative.ca\\Null_CHOP.htm",
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"description": "The Null CHOP is used as a place-holder and does not alter the data coming in.",
"summary": "The Null CHOP is used as a place-holder and does not alter the data coming in.",
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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 Null is used as a place-holder and does not alter the data coming in.\t\t\nIt is often used to Export channels to parameters, which allows you to experiment with the CHOPs that feed into the Null without having to un-export from one and re-export from another.\t\t\t\nThe Null also has options to force-cook nodes downstream from it, or the opposite, to stop cooking nodes downstream if its inputs are not changing.\t\t\t\n\nnullCHOP_Class\n\nContents\n \n \n \n \n \n \n \n\n\n\n\n\n cooktype - - This controls how nodes downstream from the Null are triggered for recooking when the Null output changes. See also: Cook\n\n auto - Downstream nodes are triggered for recooking normally. always - This node and dirty upstream nodes will cook every frame. Downstream nodes will recook every frame their data is requested. selective - Select which criteria will cause downstream nodes to require recooking, using the parameters below. This option can optimize your network by reducing the number of cooks downstream if the upstream has inputs that are time dependent or changes often, but output is mostly static (e.g. a Math rounding a constantly changing float to 0 or 1). The downside is that the nodes upstream of the Null will cook whenever something changes, even if no data is requested downstream. See Cook for more information on when data is requested.\n\t\t\n checkvalues - Recook when the Null values change.\n\n\n\t\t\n checknames - Recook when the Null channel names change.\n\n\n\t\t\n checkrange - Recook when the Null channel range changes.\t\nPlease note that downstream cooks may also cook for a variety of reasons including viewing the contents of the data while editing nodes, etc.\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. See Pattern Matching.\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 Null 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\nTo re-compute the output data of the Operators. An operator cooks when (1) its inputs change, (2) its Parameters change, (3) when the timeline moves forward in some cases, or (4) Scripting commands are run on the node. When the operator is a Panel Component, it also cooks when a user interacts with it. When an operator cooks, it usually causes operators connected to its output to re-cook. When TouchDesigner draws the screen, it re-cooks all the Dependencies - the necessary operators in all Networks, contributing to a frame's total \"cook time\".\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\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\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=Null_CHOP&oldid=24068\"\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 Null is used as a place-holder and does not alter the data coming in.\t\t\nIt is often used to Export channels to parameters, which allows you to experiment with the CHOPs that feed into the Null without having to un-export from one and re-export from another.\t\t\t\nThe Null also has options to force-cook nodes downstream from it, or the opposite, to stop cooking nodes downstream if its inputs are not changing.\t\t\t\n\nnullCHOP_Class\n\nContents\n \n \n \n \n \n \n \n\n\n\n\n\n cooktype - - This controls how nodes downstream from the Null are triggered for recooking when the Null output changes. See also: Cook\n\n auto - Downstream nodes are triggered for recooking normally. always - This node and dirty upstream nodes will cook every frame. Downstream nodes will recook every frame their data is requested. selective - Select which criteria will cause downstream nodes to require recooking, using the parameters below. This option can optimize your network by reducing the number of cooks downstream if the upstream has inputs that are time dependent or changes often, but output is mostly static (e.g. a Math rounding a constantly changing float to 0 or 1). The downside is that the nodes upstream of the Null will cook whenever something changes, even if no data is requested downstream. See Cook for more information on when data is requested.\n\t\t\n checkvalues - Recook when the Null values change.\n\n\n\t\t\n checknames - Recook when the Null channel names change.\n\n\n\t\t\n checkrange - Recook when the Null channel range changes.\t\nPlease note that downstream cooks may also cook for a variety of reasons including viewing the contents of the data while editing nodes, etc.\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. See Pattern Matching.\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 Null 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\nTo re-compute the output data of the Operators. An operator cooks when (1) its inputs change, (2) its Parameters change, (3) when the timeline moves forward in some cases, or (4) Scripting commands are run on the node. When the operator is a Panel Component, it also cooks when a user interacts with it. When an operator cooks, it usually causes operators connected to its output to re-cook. When TouchDesigner draws the screen, it re-cooks all the Dependencies - the necessary operators in all Networks, contributing to a frame's total \"cook time\".\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\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\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=Null_CHOP&oldid=24068\"\n\t\tCategory: CHOPs",
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"description": "The Null is used as a place-holder and does not alter the data coming in.\t\t\nIt is often used to Export channels to parameters, which allows you to experiment with the CHOPs that feed into the Null without having to un-export from one and re-export from another.\t\t\t\nThe Null also has options to force-cook nodes downstream from it, or the opposite, to stop cooking nodes downstream if its inputs are not changing.\t\t\t\n\nnullCHOP_Class\n\nContents\n \n \n \n \n \n \n \n\n\n\n\n\n cooktype - - This controls how nodes downstream from the Null are triggered for recooking when the Null output changes. See also: Cook\n\n auto - Downstream nodes are triggered for recooking normally. always - This node and dirty upstream nodes will cook every frame. Downstream nodes will recook every frame their data is requested. selective - Select which criteria will cause downstream nodes to require recooking, using the parameters below. This option can optimize your network by reducing the number of cooks downstream if the upstream has inputs that are time dependent or changes often, but output is mostly static (e.g. a Math rounding a constantly changing float to 0 or 1). The downside is that the nodes upstream of the Null will cook whenever something changes, even if no data is requested downstream. See Cook for more information on when data is requested.\n\t\t\n checkvalues - Recook when the Null values change.\n\n\n\t\t\n checknames - Recook when the Null channel names change.\n\n\n\t\t\n checkrange - Recook when the Null channel range changes.\t\nPlease note that downstream cooks may also cook for a variety of reasons including viewing the contents of the data while editing nodes, etc.\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. See Pattern Matching.\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 Null 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\nTo re-compute the output data of the Operators. An operator cooks when (1) its inputs change, (2) its Parameters change, (3) when the timeline moves forward in some cases, or (4) Scripting commands are run on the node. When the operator is a Panel Component, it also cooks when a user interacts with it. When an operator cooks, it usually causes operators connected to its output to re-cook. When TouchDesigner draws the screen, it re-cooks all the Dependencies - the necessary operators in all Networks, contributing to a frame's total \"cook time\".\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\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\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. 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"description": "cooktype - - This controls how nodes downstream from the Null are triggered for recooking when the Null output changes. See also: Cook\n\n auto - Downstream nodes are triggered for recooking normally. always - This node and dirty upstream nodes will cook every frame. Downstream nodes will recook every frame their data is requested. selective - Select which criteria will cause downstream nodes to require recooking, using the parameters below. This option can optimize your network by reducing the number of cooks downstream if the upstream has inputs that are time dependent or changes often, but output is mostly static (e.g. a Math rounding a constantly changing float to 0 or 1). The downside is that the nodes upstream of the Null will cook whenever something changes, even if no data is requested downstream. See Cook for more information on when data is requested.",
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"description": "auto - Downstream nodes are triggered for recooking normally. always - This node and dirty upstream nodes will cook every frame. Downstream nodes will recook every frame their data is requested. selective - Select which criteria will cause downstream nodes to require recooking, using the parameters below. This option can optimize your network by reducing the number of cooks downstream if the upstream has inputs that are time dependent or changes often, but output is mostly static (e.g. a Math rounding a constantly changing float to 0 or 1). The downside is that the nodes upstream of the Null will cook whenever something changes, even if no data is requested downstream. See Cook for more information on when data is requested.",
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"description": "scope - To determine which channels get affected, some CHOPs use a string on the Common page. See Pattern Matching.",
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