{
  "id": "render_pick_chop",
  "name": "Render Pick CHOP",
  "displayName": "Render Pick CHOP",
  "category": "CHOP",
  "subcategory": "Generators",
  "version": "",
  "lastUpdated": "2025-08-07T07:50:08.636Z",
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  "url": "",
  "description": "The Render Pick CHOP samples a rendering (from a Render TOP or a Render Pass TOP) and returns 3D information from the geometry at that particular pick location. Values sampled can include position, normals, point color, texture coordinates, depth and the object's path.\tAn Info DAT should be used to retrieve the object's path.",
  "summary": "The Render Pick CHOP samples a rendering (from a Render TOP or a Render Pass TOP) and returns 3D information from the geometry at that particular pick location. Values sampled can include position, no",
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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 Render Pick  samples a rendering (from a Render TOP or a Render Pass TOP) and returns 3D information from the geometry at that particular pick location. Values sampled can include position, normals, point color, texture coordinates, depth and the object's path.\tAn Info DAT should be used to retrieve the object's path.\nThe pick location is specified through uv coordinates of the rendering. These uv coordinates can be selected by clicking on a Panel Component or explicitly setting them in the U and V parameters in the Render Pick .\nAlong with the geometric data returned, this node has two channels 'picked' and 'trigger' that inform the picked status. 'picked' will be 1 when an object has been found at the search location. 'trigger' will be 1 when both an object has been found, and the 'Picking By' condition has been met. That is, either the '' is 1, or the 'Select' parmeter is 'On.\nSee also the multi-sample Render Pick DAT.\nrenderpickCHOP_Class\n\nContents\n \n \n \n \n \n \n \n\n\n\n\n\n  strategy -  - Decides when to update values based on pick interactions.\n\n select - holdfirst - Holds the values first returned when geometry picked. holdlast - Holds the values last returned when geometry picked. This differs from the Continuous strategy in that it will hold the last values picked on geometry if the pick starts sampling empty space (no geometry in that part of the scene). Alternatively, using the Continuous strategy the values will be cleared to zero if the pick starts sampling empty space. always -\n\t\t\n  clearprev - This parameter is only enabled when the Strategy is set to Hold Last Picked. When this is on, starting a new pick on empty space will clear the values. When off, the last values will be held if the pick starts on empty space.\n\n\n\t\t\n  responsetime -  - Determines when the values are updated.\n\n nextcook - The values are captured on the current frame and updated next frame. Results are from the previous frame, but much faster cook times. thiscook - The values are captured and updated in the current frame.\n\t\t\n  pickradius - Controls the radius of the search area for the pick. If nothing is found at the pick's center it will keep searching for geometry in the search area defined by the Pick Radius.\n\n\n\t\t\n  pickradstep - Used to reduce the searching within the search area. The search area is sampled at locations that correspond to 'spokes' outwards from the center pick point.\n\n\n\t\t\n  pickcirstep - Used to reduce the searching within the search area. The search area is sampled at locations that correspond to 'rings' outwards from the center pick point.\n\n\n\t\t\n  rendertop - Specifies which render to sample.\n\n\n\t\t\n  usepickableflags - When turned on only geometry whose Pickable Flag is on can be selected by the Render Pick . The Pickable Flag is found on all Object components.\n\n\n\t\t\n  includenonpickable - Includes the non-pickable objects in the picking algorithm such that non-pickable objects may occlude pickable objects.  For example, if there is only one pickable object in the scene with lots of additional non-pickable geometry is present, turning this parameter on will prevent the pickable object from being selected if it is behind a non-pickage object (occluded by the non-pickage object).\n\n\n\t\t\n  pickingby -  - Determines how the pick location is set.\n\n panel - Uses the  scoped in the  parameter. The uv position of the mouse on this component's control panel will be the uv position in the render that is sampled. The pick is active when the panel value specified by the  parameter is 1. parameters - Uses the U, V, and Pick parameters below for picking.\n\t\t\n  panel - Specifies which panel component to use when picking by panel.\n\n\n\t\t\n  panelvalue - Specifies with panel value to use to trigger the pick when picking by panel.\n\n\n\t\t\n  picku - Sets the u coordinate when picking by parameters.\n\n\n\t\t\n  pickv - Sets the v coordinate when picking by parameters.\n\n\n\t\t\n  select - When picking by parameters, picking is active when this parameter = 1.\n\n\n\t\t\n  activatecallbacks - Enables   for each pick event.\n\n\n\t\t\n  callbacks -  to a  containing callbacks for pick event received.\n\n\n\n\n\n  position -  - Returns the position of the point picked on the geometry. Channels tx, ty, tz.\n\n no - Do not return position values. sopspace - Return position of point picked in  transform space. worldspace - Return position of point picked in world transform space. cameraspace - Return position of point picked in camera transform space. relativetoobj - Return position of point picked relative to object specified in   parameter.\n\t\t\n  normal -  - Returns the normals of the point picked on the geometry. Channels nx, ny, nz.\n\n no - Do not return normal values. sopspace - Return normals of point picked in  transform space. worldspace - Return normals of point picked in world transform space. cameraspace - Return normals of point picked in camera transform space. relativetoobj - Return normals of point picked relative to object specified in   parameter.\n\t\t\n  referenceobj - Object used when fetching position or normals Relative to .\n\n\n\t\t\n  color - Returns the point color of the point picked on the geometry. Channels cr, cg, cb, ca.\n\n\n\t\t\n  uv - Returns the texture coordinates of the point picked on the geometry. Channels mapu, mapv, mapw.\n\n\n\t\t\n  path - Return the path to the object that is picked. This result requires and Info DAT with its Node  parameter referecning the Render Pick .\n\n\n\t\t\n  depth - Returns the depth of the point picked on the geometry. This value a non-linear ratio of the point's position between the near and far planes of the Depth Buffer. Channel is depth.\n\n\n\t\t\n  instanceid - Returns the  ID of the object. This will always be 0 if instancing is off. Channel is instance.\n\n\n\t\t\n  customattrib1 - Specify which custom attributes to return from the object.\n\n\n\t\t\n  customattrib1type - The type of attribute is selected from this menu.\n\n\n\t\t\n  customattrib2 - Specify which custom attributes to return from the object.\n\n\n\t\t\n  customattrib2type - The type of attribute is selected from this menu.\n\n\n\t\t\n  customattrib3 - Specify which custom attributes to return from the object.\n\n\n\t\t\n  customattrib3type - The type of attribute is selected from this menu.\n\n\n\t\t\n  customattrib4 - Specify which custom attributes to return from the object.\n\n\n\t\t\n  customattrib4type - The type of attribute is selected from this menu.\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\nExtra Information for the Render Pick  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\nThe internal states of a panel component are Panel Values, and are accessed with a Panel CHOP, a OP.panel Python expression, or a Panel Execute DAT.\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\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\nA custom interactive control panel built within TouchDesigner. Panels are created using Panel Components.\n\n\n\nThe sub-Family of Components that are used to create custom interactive 2D control panels (Container, Widget, Text COMP Slider, Button, etc.).\n\n\n\nSome operators have a DAT docked to them that contains some python functions. These functions, called \"callbacks\", get called when something in the operator changes.\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\nA Operator Family that reads, creates and modifies 3D points, polygons, lines, particles, surfaces, spheres and meatballs. Particles and point clouds are now done primarily on the GPU using TOPs.\n\n\n\nThe sub-Family of Component types that are used to define and render 3D scenes. A Geometry Component is an Object that contains the 3D shapes to render. A Camera COMP and Light COMP are other Object types. Separately, \"Objects\" also refers to Python objects.\n\n\n\nA Link. The grey dashed lines between nodes is a Reference or Link that indicates one operator is getting data from another operator from any Operator Family.\n\n\nThe grey dashed lines between nodes is a Reference (or Link). A Reference is (1) a Parameter Reference, a parameter in an OP that is a name or path to another operator, (2) a Node Reference, an expression in a parameter or DAT script that contains the name or path of another operator, (3) a DAT Cell Reference or (4) a CHOP Channel Reference.\n\n\nA Link or Reference is a dashed line between nodes that represent other data flowing between nodes. Examples are CHOP Exports, node Paths in parameters, and expressions in parameters referencing CHOP channels, DAT tables and other nodes. In contrast is a Wire that connects nodes in the same Operator Family.\n\n\n\nEach SOP has a list of Points. Each point has an XYZ 3D position value plus other optional attributes. Each polygon Primitive is defined by a vertex list, which is list of point numbers.\n\n\n\n(1) A Geometry Component can instance and render its SOP geometry many times: once for each sample in a CHOP, row of a DAT table, pixel in a TOP, or point of a SOP, (2) An instance is an OP that doesn't actually have its own data, but rather just refers to an OP (or has an input) whose data it uses. This includes Null OPs, Switch OPs and in some cases Select OPs.\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\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 Render Pick  samples a rendering (from a Render TOP or a Render Pass TOP) and returns 3D information from the geometry at that particular pick location. Values sampled can include position, normals, point color, texture coordinates, depth and the object's path.\tAn Info DAT should be used to retrieve the object's path.\nThe pick location is specified through uv coordinates of the rendering. These uv coordinates can be selected by clicking on a Panel Component or explicitly setting them in the U and V parameters in the Render Pick .\nAlong with the geometric data returned, this node has two channels 'picked' and 'trigger' that inform the picked status. 'picked' will be 1 when an object has been found at the search location. 'trigger' will be 1 when both an object has been found, and the 'Picking By' condition has been met. That is, either the '' is 1, or the 'Select' parmeter is 'On.\nSee also the multi-sample Render Pick DAT.\nrenderpickCHOP_Class\n\nContents\n \n \n \n \n \n \n \n\n\n\n\n\n  strategy -  - Decides when to update values based on pick interactions.\n\n select - holdfirst - Holds the values first returned when geometry picked. holdlast - Holds the values last returned when geometry picked. This differs from the Continuous strategy in that it will hold the last values picked on geometry if the pick starts sampling empty space (no geometry in that part of the scene). Alternatively, using the Continuous strategy the values will be cleared to zero if the pick starts sampling empty space. always -\n\t\t\n  clearprev - This parameter is only enabled when the Strategy is set to Hold Last Picked. When this is on, starting a new pick on empty space will clear the values. When off, the last values will be held if the pick starts on empty space.\n\n\n\t\t\n  responsetime -  - Determines when the values are updated.\n\n nextcook - The values are captured on the current frame and updated next frame. Results are from the previous frame, but much faster cook times. thiscook - The values are captured and updated in the current frame.\n\t\t\n  pickradius - Controls the radius of the search area for the pick. If nothing is found at the pick's center it will keep searching for geometry in the search area defined by the Pick Radius.\n\n\n\t\t\n  pickradstep - Used to reduce the searching within the search area. The search area is sampled at locations that correspond to 'spokes' outwards from the center pick point.\n\n\n\t\t\n  pickcirstep - Used to reduce the searching within the search area. The search area is sampled at locations that correspond to 'rings' outwards from the center pick point.\n\n\n\t\t\n  rendertop - Specifies which render to sample.\n\n\n\t\t\n  usepickableflags - When turned on only geometry whose Pickable Flag is on can be selected by the Render Pick . The Pickable Flag is found on all Object components.\n\n\n\t\t\n  includenonpickable - Includes the non-pickable objects in the picking algorithm such that non-pickable objects may occlude pickable objects.  For example, if there is only one pickable object in the scene with lots of additional non-pickable geometry is present, turning this parameter on will prevent the pickable object from being selected if it is behind a non-pickage object (occluded by the non-pickage object).\n\n\n\t\t\n  pickingby -  - Determines how the pick location is set.\n\n panel - Uses the  scoped in the  parameter. The uv position of the mouse on this component's control panel will be the uv position in the render that is sampled. The pick is active when the panel value specified by the  parameter is 1. parameters - Uses the U, V, and Pick parameters below for picking.\n\t\t\n  panel - Specifies which panel component to use when picking by panel.\n\n\n\t\t\n  panelvalue - Specifies with panel value to use to trigger the pick when picking by panel.\n\n\n\t\t\n  picku - Sets the u coordinate when picking by parameters.\n\n\n\t\t\n  pickv - Sets the v coordinate when picking by parameters.\n\n\n\t\t\n  select - When picking by parameters, picking is active when this parameter = 1.\n\n\n\t\t\n  activatecallbacks - Enables   for each pick event.\n\n\n\t\t\n  callbacks -  to a  containing callbacks for pick event received.\n\n\n\n\n\n  position -  - Returns the position of the point picked on the geometry. Channels tx, ty, tz.\n\n no - Do not return position values. sopspace - Return position of point picked in  transform space. worldspace - Return position of point picked in world transform space. cameraspace - Return position of point picked in camera transform space. relativetoobj - Return position of point picked relative to object specified in   parameter.\n\t\t\n  normal -  - Returns the normals of the point picked on the geometry. Channels nx, ny, nz.\n\n no - Do not return normal values. sopspace - Return normals of point picked in  transform space. worldspace - Return normals of point picked in world transform space. cameraspace - Return normals of point picked in camera transform space. relativetoobj - Return normals of point picked relative to object specified in   parameter.\n\t\t\n  referenceobj - Object used when fetching position or normals Relative to .\n\n\n\t\t\n  color - Returns the point color of the point picked on the geometry. Channels cr, cg, cb, ca.\n\n\n\t\t\n  uv - Returns the texture coordinates of the point picked on the geometry. Channels mapu, mapv, mapw.\n\n\n\t\t\n  path - Return the path to the object that is picked. This result requires and Info DAT with its Node  parameter referecning the Render Pick .\n\n\n\t\t\n  depth - Returns the depth of the point picked on the geometry. This value a non-linear ratio of the point's position between the near and far planes of the Depth Buffer. Channel is depth.\n\n\n\t\t\n  instanceid - Returns the  ID of the object. This will always be 0 if instancing is off. Channel is instance.\n\n\n\t\t\n  customattrib1 - Specify which custom attributes to return from the object.\n\n\n\t\t\n  customattrib1type - The type of attribute is selected from this menu.\n\n\n\t\t\n  customattrib2 - Specify which custom attributes to return from the object.\n\n\n\t\t\n  customattrib2type - The type of attribute is selected from this menu.\n\n\n\t\t\n  customattrib3 - Specify which custom attributes to return from the object.\n\n\n\t\t\n  customattrib3type - The type of attribute is selected from this menu.\n\n\n\t\t\n  customattrib4 - Specify which custom attributes to return from the object.\n\n\n\t\t\n  customattrib4type - The type of attribute is selected from this menu.\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\nExtra Information for the Render Pick  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\nThe internal states of a panel component are Panel Values, and are accessed with a Panel CHOP, a OP.panel Python expression, or a Panel Execute DAT.\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\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\nA custom interactive control panel built within TouchDesigner. Panels are created using Panel Components.\n\n\n\nThe sub-Family of Components that are used to create custom interactive 2D control panels (Container, Widget, Text COMP Slider, Button, etc.).\n\n\n\nSome operators have a DAT docked to them that contains some python functions. These functions, called \"callbacks\", get called when something in the operator changes.\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\nA Operator Family that reads, creates and modifies 3D points, polygons, lines, particles, surfaces, spheres and meatballs. Particles and point clouds are now done primarily on the GPU using TOPs.\n\n\n\nThe sub-Family of Component types that are used to define and render 3D scenes. A Geometry Component is an Object that contains the 3D shapes to render. A Camera COMP and Light COMP are other Object types. Separately, \"Objects\" also refers to Python objects.\n\n\n\nA Link. The grey dashed lines between nodes is a Reference or Link that indicates one operator is getting data from another operator from any Operator Family.\n\n\nThe grey dashed lines between nodes is a Reference (or Link). A Reference is (1) a Parameter Reference, a parameter in an OP that is a name or path to another operator, (2) a Node Reference, an expression in a parameter or DAT script that contains the name or path of another operator, (3) a DAT Cell Reference or (4) a CHOP Channel Reference.\n\n\nA Link or Reference is a dashed line between nodes that represent other data flowing between nodes. Examples are CHOP Exports, node Paths in parameters, and expressions in parameters referencing CHOP channels, DAT tables and other nodes. In contrast is a Wire that connects nodes in the same Operator Family.\n\n\n\nEach SOP has a list of Points. Each point has an XYZ 3D position value plus other optional attributes. Each polygon Primitive is defined by a vertex list, which is list of point numbers.\n\n\n\n(1) A Geometry Component can instance and render its SOP geometry many times: once for each sample in a CHOP, row of a DAT table, pixel in a TOP, or point of a SOP, (2) An instance is an OP that doesn't actually have its own data, but rather just refers to an OP (or has an input) whose data it uses. This includes Null OPs, Switch OPs and in some cases Select OPs.\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\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 Render Pick  samples a rendering (from a Render TOP or a Render Pass TOP) and returns 3D information from the geometry at that particular pick location. Values sampled can include position, normals, point color, texture coordinates, depth and the object's path.\tAn Info DAT should be used to retrieve the object's path.\nThe pick location is specified through uv coordinates of the rendering. These uv coordinates can be selected by clicking on a Panel Component or explicitly setting them in the U and V parameters in the Render Pick .\nAlong with the geometric data returned, this node has two channels 'picked' and 'trigger' that inform the picked status. 'picked' will be 1 when an object has been found at the search location. 'trigger' will be 1 when both an object has been found, and the 'Picking By' condition has been met. That is, either the '' is 1, or the 'Select' parmeter is 'On.\nSee also the multi-sample Render Pick DAT.\nrenderpickCHOP_Class\n\nContents\n \n \n \n \n \n \n \n\n\n\n\n\n  strategy -  - Decides when to update values based on pick interactions.\n\n select - holdfirst - Holds the values first returned when geometry picked. holdlast - Holds the values last returned when geometry picked. This differs from the Continuous strategy in that it will hold the last values picked on geometry if the pick starts sampling empty space (no geometry in that part of the scene). Alternatively, using the Continuous strategy the values will be cleared to zero if the pick starts sampling empty space. always -\n\t\t\n  clearprev - This parameter is only enabled when the Strategy is set to Hold Last Picked. When this is on, starting a new pick on empty space will clear the values. When off, the last values will be held if the pick starts on empty space.\n\n\n\t\t\n  responsetime -  - Determines when the values are updated.\n\n nextcook - The values are captured on the current frame and updated next frame. Results are from the previous frame, but much faster cook times. thiscook - The values are captured and updated in the current frame.\n\t\t\n  pickradius - Controls the radius of the search area for the pick. If nothing is found at the pick's center it will keep searching for geometry in the search area defined by the Pick Radius.\n\n\n\t\t\n  pickradstep - Used to reduce the searching within the search area. The search area is sampled at locations that correspond to 'spokes' outwards from the center pick point.\n\n\n\t\t\n  pickcirstep - Used to reduce the searching within the search area. The search area is sampled at locations that correspond to 'rings' outwards from the center pick point.\n\n\n\t\t\n  rendertop - Specifies which render to sample.\n\n\n\t\t\n  usepickableflags - When turned on only geometry whose Pickable Flag is on can be selected by the Render Pick . The Pickable Flag is found on all Object components.\n\n\n\t\t\n  includenonpickable - Includes the non-pickable objects in the picking algorithm such that non-pickable objects may occlude pickable objects.  For example, if there is only one pickable object in the scene with lots of additional non-pickable geometry is present, turning this parameter on will prevent the pickable object from being selected if it is behind a non-pickage object (occluded by the non-pickage object).\n\n\n\t\t\n  pickingby -  - Determines how the pick location is set.\n\n panel - Uses the  scoped in the  parameter. The uv position of the mouse on this component's control panel will be the uv position in the render that is sampled. The pick is active when the panel value specified by the  parameter is 1. parameters - Uses the U, V, and Pick parameters below for picking.\n\t\t\n  panel - Specifies which panel component to use when picking by panel.\n\n\n\t\t\n  panelvalue - Specifies with panel value to use to trigger the pick when picking by panel.\n\n\n\t\t\n  picku - Sets the u coordinate when picking by parameters.\n\n\n\t\t\n  pickv - Sets the v coordinate when picking by parameters.\n\n\n\t\t\n  select - When picking by parameters, picking is active when this parameter = 1.\n\n\n\t\t\n  activatecallbacks - Enables   for each pick event.\n\n\n\t\t\n  callbacks -  to a  containing callbacks for pick event received.\n\n\n\n\n\n  position -  - Returns the position of the point picked on the geometry. Channels tx, ty, tz.\n\n no - Do not return position values. sopspace - Return position of point picked in  transform space. worldspace - Return position of point picked in world transform space. cameraspace - Return position of point picked in camera transform space. relativetoobj - Return position of point picked relative to object specified in   parameter.\n\t\t\n  normal -  - Returns the normals of the point picked on the geometry. Channels nx, ny, nz.\n\n no - Do not return normal values. sopspace - Return normals of point picked in  transform space. worldspace - Return normals of point picked in world transform space. cameraspace - Return normals of point picked in camera transform space. relativetoobj - Return normals of point picked relative to object specified in   parameter.\n\t\t\n  referenceobj - Object used when fetching position or normals Relative to .\n\n\n\t\t\n  color - Returns the point color of the point picked on the geometry. Channels cr, cg, cb, ca.\n\n\n\t\t\n  uv - Returns the texture coordinates of the point picked on the geometry. Channels mapu, mapv, mapw.\n\n\n\t\t\n  path - Return the path to the object that is picked. This result requires and Info DAT with its Node  parameter referecning the Render Pick .\n\n\n\t\t\n  depth - Returns the depth of the point picked on the geometry. This value a non-linear ratio of the point's position between the near and far planes of the Depth Buffer. Channel is depth.\n\n\n\t\t\n  instanceid - Returns the  ID of the object. This will always be 0 if instancing is off. Channel is instance.\n\n\n\t\t\n  customattrib1 - Specify which custom attributes to return from the object.\n\n\n\t\t\n  customattrib1type - The type of attribute is selected from this menu.\n\n\n\t\t\n  customattrib2 - Specify which custom attributes to return from the object.\n\n\n\t\t\n  customattrib2type - The type of attribute is selected from this menu.\n\n\n\t\t\n  customattrib3 - Specify which custom attributes to return from the object.\n\n\n\t\t\n  customattrib3type - The type of attribute is selected from this menu.\n\n\n\t\t\n  customattrib4 - Specify which custom attributes to return from the object.\n\n\n\t\t\n  customattrib4type - The type of attribute is selected from this menu.\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\nExtra Information for the Render Pick  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\nThe internal states of a panel component are Panel Values, and are accessed with a Panel CHOP, a OP.panel Python expression, or a Panel Execute DAT.\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\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\nA custom interactive control panel built within TouchDesigner. Panels are created using Panel Components.\n\n\n\nThe sub-Family of Components that are used to create custom interactive 2D control panels (Container, Widget, Text COMP Slider, Button, etc.).\n\n\n\nSome operators have a DAT docked to them that contains some python functions. These functions, called \"callbacks\", get called when something in the operator changes.\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\nA Operator Family that reads, creates and modifies 3D points, polygons, lines, particles, surfaces, spheres and meatballs. Particles and point clouds are now done primarily on the GPU using TOPs.\n\n\n\nThe sub-Family of Component types that are used to define and render 3D scenes. A Geometry Component is an Object that contains the 3D shapes to render. A Camera COMP and Light COMP are other Object types. Separately, \"Objects\" also refers to Python objects.\n\n\n\nA Link. The grey dashed lines between nodes is a Reference or Link that indicates one operator is getting data from another operator from any Operator Family.\n\n\nThe grey dashed lines between nodes is a Reference (or Link). A Reference is (1) a Parameter Reference, a parameter in an OP that is a name or path to another operator, (2) a Node Reference, an expression in a parameter or DAT script that contains the name or path of another operator, (3) a DAT Cell Reference or (4) a CHOP Channel Reference.\n\n\nA Link or Reference is a dashed line between nodes that represent other data flowing between nodes. Examples are CHOP Exports, node Paths in parameters, and expressions in parameters referencing CHOP channels, DAT tables and other nodes. In contrast is a Wire that connects nodes in the same Operator Family.\n\n\n\nEach SOP has a list of Points. Each point has an XYZ 3D position value plus other optional attributes. Each polygon Primitive is defined by a vertex list, which is list of point numbers.\n\n\n\n(1) A Geometry Component can instance and render its SOP geometry many times: once for each sample in a CHOP, row of a DAT table, pixel in a TOP, or point of a SOP, (2) An instance is an OP that doesn't actually have its own data, but rather just refers to an OP (or has an input) whose data it uses. This includes Null OPs, Switch OPs and in some cases Select OPs.\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\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=Render_Pick_CHOP&oldid=24154\"",
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      "description": "strategy -  - Decides when to update values based on pick interactions.\n\n select - holdfirst - Holds the values first returned when geometry picked. holdlast - Holds the values last returned when geometry picked. This differs from the Continuous strategy in that it will hold the last values picked on geometry if the pick starts sampling empty space (no geometry in that part of the scene). Alternatively, using the Continuous strategy the values will be cleared to zero if the pick starts sampling empty space. always -",
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      "name": "While Select",
      "label": "While Select",
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      "description": "select - holdfirst - Holds the values first returned when geometry picked. holdlast - Holds the values last returned when geometry picked. This differs from the Continuous strategy in that it will hold the last values picked on geometry if the pick starts sampling empty space (no geometry in that part of the scene). Alternatively, using the Continuous strategy the values will be cleared to zero if the pick starts sampling empty space. always -",
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      "name": "Clear Previous Pick on New Pick",
      "label": "Clear Previous Pick on New Pick",
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      "description": "clearprev - This parameter is only enabled when the Strategy is set to Hold Last Picked. When this is on, starting a new pick on empty space will clear the values. When off, the last values will be held if the pick starts on empty space.",
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    {
      "id": null,
      "name": "Response Time",
      "label": "Response Time",
      "group": "General",
      "page": "",
      "type": "float",
      "dataType": "number",
      "style": "",
      "defaultValue": null,
      "minValue": null,
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      "description": "responsetime -  - Determines when the values are updated.\n\n nextcook - The values are captured on the current frame and updated next frame. Results are from the previous frame, but much faster cook times. thiscook - The values are captured and updated in the current frame.",
      "tooltip": "",
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      "isReadOnly": false,
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      "id": null,
      "name": "Next Cook (Faster)",
      "label": "Next Cook (Faster)",
      "group": "General",
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      "type": "float",
      "dataType": "number",
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      "defaultValue": null,
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      "description": "nextcook - The values are captured on the current frame and updated next frame. Results are from the previous frame, but much faster cook times. thiscook - The values are captured and updated in the current frame.",
      "tooltip": "",
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    {
      "id": null,
      "name": "Pick Radius",
      "label": "Pick Radius",
      "group": "General",
      "page": "",
      "type": "float",
      "dataType": "number",
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      "defaultValue": null,
      "minValue": null,
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      "arraySize": 1,
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      "description": "pickradius - Controls the radius of the search area for the pick. If nothing is found at the pick's center it will keep searching for geometry in the search area defined by the Pick Radius.",
      "tooltip": "",
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      "examples": [],
      "isReadOnly": false,
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    {
      "id": null,
      "name": "Pick Radial Step",
      "label": "Pick Radial Step",
      "group": "General",
      "page": "",
      "type": "float",
      "dataType": "number",
      "style": "",
      "defaultValue": null,
      "minValue": null,
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      "arraySize": 1,
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      "description": "pickradstep - Used to reduce the searching within the search area. The search area is sampled at locations that correspond to 'spokes' outwards from the center pick point.",
      "tooltip": "",
      "help": "",
      "units": "",
      "examples": [],
      "isReadOnly": false,
      "isAdvanced": false,
      "isHidden": false,
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      "isVisible": true,
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    {
      "id": null,
      "name": "Pick Circular Step",
      "label": "Pick Circular Step",
      "group": "General",
      "page": "",
      "type": "float",
      "dataType": "number",
      "style": "",
      "defaultValue": null,
      "minValue": null,
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      "isArray": false,
      "arraySize": 1,
      "dimensions": 1,
      "description": "pickcirstep - Used to reduce the searching within the search area. The search area is sampled at locations that correspond to 'rings' outwards from the center pick point.",
      "tooltip": "",
      "help": "",
      "units": "",
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      "isReadOnly": false,
      "isAdvanced": false,
      "isHidden": false,
      "isAnimatable": true,
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      "order": 0,
      "isVisible": true,
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      "lastUpdated": "2025-08-07T07:50:08.633Z",
      "rawData": {},
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    },
    {
      "id": null,
      "name": "Render/RenderPass TOP",
      "label": "Render/RenderPass TOP",
      "group": "General",
      "page": "",
      "type": "float",
      "dataType": "number",
      "style": "",
      "defaultValue": null,
      "minValue": null,
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      "description": "rendertop - Specifies which render to sample.",
      "tooltip": "",
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      "isReadOnly": false,
      "isAdvanced": false,
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    {
      "id": null,
      "name": "Use Pickable Flags",
      "label": "Use Pickable Flags",
      "group": "General",
      "page": "",
      "type": "float",
      "dataType": "number",
      "style": "",
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      "tooltip": "",
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      "isReadOnly": false,
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      "id": null,
      "name": "Include Non-Pickable Objects",
      "label": "Include Non-Pickable Objects",
      "group": "General",
      "page": "",
      "type": "float",
      "dataType": "number",
      "style": "",
      "defaultValue": null,
      "minValue": null,
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      "description": "includenonpickable - Includes the non-pickable objects in the picking algorithm such that non-pickable objects may occlude pickable objects.  For example, if there is only one pickable object in the scene with lots of additional non-pickable geometry is present, turning this parameter on will prevent the pickable object from being selected if it is behind a non-pickage object (occluded by the non-pickage object).",
      "tooltip": "",
      "help": "",
      "units": "",
      "examples": [],
      "isReadOnly": false,
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    {
      "id": null,
      "name": "Picking by",
      "label": "Picking by",
      "group": "General",
      "page": "",
      "type": "float",
      "dataType": "number",
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      "defaultValue": null,
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      "tooltip": "",
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      "examples": [],
      "isReadOnly": false,
      "isAdvanced": false,
      "isHidden": false,
      "isAnimatable": true,
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      "lastUpdated": "2025-08-07T07:50:08.633Z",
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      "id": null,
      "name": "Panel",
      "label": "Panel",
      "group": "General",
      "page": "",
      "type": "float",
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      "style": "",
      "defaultValue": null,
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      "description": "panel - Uses the  scoped in the  parameter. The uv position of the mouse on this component's control panel will be the uv position in the render that is sampled. The pick is active when the panel value specified by the  parameter is 1. parameters - Uses the U, V, and Pick parameters below for picking.",
      "tooltip": "",
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      "units": "",
      "examples": [],
      "isReadOnly": false,
      "isAdvanced": false,
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      "id": null,
      "name": "Panel",
      "label": "Panel",
      "group": "General",
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      "defaultValue": null,
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      "description": "panel - Specifies which panel component to use when picking by panel.",
      "tooltip": "",
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      "units": "",
      "examples": [],
      "isReadOnly": false,
      "isAdvanced": false,
      "isHidden": false,
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      "lastUpdated": "2025-08-07T07:50:08.633Z",
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    {
      "id": null,
      "name": "Panel Value",
      "label": "Panel Value",
      "group": "General",
      "page": "",
      "type": "float",
      "dataType": "number",
      "style": "",
      "defaultValue": null,
      "minValue": null,
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      "arraySize": 1,
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      "description": "panelvalue - Specifies with panel value to use to trigger the pick when picking by panel.",
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      "units": "",
      "examples": [],
      "isReadOnly": false,
      "isAdvanced": false,
      "isHidden": false,
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    {
      "id": null,
      "name": "U",
      "label": "U",
      "group": "General",
      "page": "",
      "type": "float",
      "dataType": "number",
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      "defaultValue": null,
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      "description": "picku - Sets the u coordinate when picking by parameters.",
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      "isReadOnly": false,
      "isAdvanced": false,
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      "id": null,
      "name": "V",
      "label": "V",
      "group": "General",
      "page": "",
      "type": "float",
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      "defaultValue": null,
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      "description": "pickv - Sets the v coordinate when picking by parameters.",
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      "isReadOnly": false,
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      "id": null,
      "name": "Select",
      "label": "Select",
      "group": "General",
      "page": "",
      "type": "float",
      "dataType": "number",
      "style": "",
      "defaultValue": null,
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      "arraySize": 1,
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      "description": "select - When picking by parameters, picking is active when this parameter = 1.",
      "tooltip": "",
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      "units": "",
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      "isReadOnly": false,
      "isAdvanced": false,
      "isHidden": false,
      "isAnimatable": true,
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      "lastUpdated": "2025-08-07T07:50:08.633Z",
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    },
    {
      "id": null,
      "name": "Activate Callbacks",
      "label": "Activate Callbacks",
      "group": "General",
      "page": "",
      "type": "float",
      "dataType": "number",
      "style": "",
      "defaultValue": null,
      "minValue": null,
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      "description": "activatecallbacks - Enables   for each pick event.",
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      "isReadOnly": false,
      "isAdvanced": false,
      "isHidden": false,
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    {
      "id": null,
      "name": "Callbacks DAT",
      "label": "Callbacks DAT",
      "group": "General",
      "page": "",
      "type": "float",
      "dataType": "number",
      "style": "",
      "defaultValue": null,
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      "description": "callbacks -  to a  containing callbacks for pick event received.",
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      "isReadOnly": false,
      "isAdvanced": false,
      "isHidden": false,
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    {
      "id": null,
      "name": "Fetch Position",
      "label": "Fetch Position",
      "group": "General",
      "page": "",
      "type": "float",
      "dataType": "number",
      "style": "",
      "defaultValue": null,
      "minValue": null,
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      "description": "position -  - Returns the position of the point picked on the geometry. Channels tx, ty, tz.\n\n no - Do not return position values. sopspace - Return position of point picked in  transform space. worldspace - Return position of point picked in world transform space. cameraspace - Return position of point picked in camera transform space. relativetoobj - Return position of point picked relative to object specified in   parameter.",
      "tooltip": "",
      "help": "",
      "units": "",
      "examples": [],
      "isReadOnly": false,
      "isAdvanced": false,
      "isHidden": false,
      "isAnimatable": true,
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