{ "id": "surfsect_sop", "name": "Surfsect SOP", "displayName": "Surfsect SOP", "category": "SOP", "subcategory": "Generators", "version": "", "lastUpdated": "2025-08-07T07:50:10.157Z", "sourceFile": "C:\\Program Files\\Derivative\\TouchDesigner\\Samples\\Learn\\OfflineHelp\\https.docs.derivative.ca\\Surfsect_SOP.htm", "url": "", "description": "The Surfsect SOP performs boolean operations with NURBS and Bezier surfaces, or only generates profiles where the surfaces intersect. The individual surfaces do not need to be solids (i.e. wrap in U and V), nor do they need to form a solid as a group (for example, you can cut a grid with a sphere).", "summary": "The Surfsect SOP performs boolean operations with NURBS and Bezier surfaces, or only generates profiles where the surfaces intersect. The individual surfaces do not need to be solids (i.e. wrap in U a", "details": "", "usage": "", "tips": [], "warnings": [], "parameters": [ { "id": null, "name": "Group A", "label": "Group A", "group": "General", "page": "", "type": "float", "dataType": "number", "style": "", "defaultValue": null, "minValue": null, "maxValue": null, "step": null, "menuItems": [], "menuLabels": [], "allowCustom": false, "maxLength": null, "pattern": null, "isArray": false, "arraySize": 1, "dimensions": 1, "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 Surfsect performs boolean operations with NURBS and Bezier surfaces, or only generates profiles where the surfaces intersect. The individual surfaces do not need to be solids (i.e. wrap in U and V), nor do they need to form a solid as a group (for example, you can cut a grid with a sphere).\t\t\nThe surfaces in the first input are denoted by \"A\" in the parameter list. The surfaces in the second input are denoted by \"B\". The entire A set is intersected with the B set, which allows for true csg operations with spline surfaces. Thus, if A forms a solid and B forms a solid, any boolean operation between A and B will produce a solid. If either set has an open topology, the result will also be open.\t\t\t\nWhat is deemed to be the inside and outside of a trim region depends on the direction of the surface normals. If necessary, use the Primitive SOP to reverse the surface normals by reversing the surface's U or V direction.\nsurfsectSOP_Class\n\nContents\n \n \n \n \n \n \n \n \n\n\n\n\n\n groupa - Subset of NURBS and Bezier surfaces. Accepts patterns, as described in Pattern Matching.\n\n\n\t\t\t\n groupb - Subset of NURBS and Bezier surfaces to intersect with A. Accepts patterns, as described in Pattern Matching.\n\n\n\t\t\t\n tol3d - World space precision of the intersection.\n\n\n\t\t\t\n tol2d - Domain precision of the intersection.\n\n\n\t\t\t\n step - Number of steps for tracing each profile span.\n\n\n\n\n\nEnables boolean operations between the surfaces in A and B:\n\n boolop - - Select from the following operations: , , , , or .\t\nIf the is set to , the following options become available:\n\n\n union - intersect - aminusb - bminusa - other -\n\t\t\n insidea - Preserve the inside sections of the A surfaces.\n\n\n\t\t\n insideb - Preserve the inside sections of the B surfaces.\n\n\n\t\t\n outsidea - Preserve the outside sections of the A surfaces.\n\n\n\t\t\n outsideb - Preserve the outside sections of the B surfaces.\n\n\n\n\n\nJust create profiles where the surfaces intersect.\n\n target - - Which surface to output profiles for: A, B, or both.\n\n a - b - both -\n\t\t\n creategroupa - Place the A profiles in a user-defined group.\n\n\n\t\t\n profilesa - The name assigned to profile group A.\n\n\n\t\t\n creategroupb - Place the B profiles in a user-defined group.\n\n\n\t\t\n profilesb - The name assigned to profile group B.\n\n\n\t\t\n mindholes - Intersect only the visible surface parts and truncate the intersection profile at the trimmed-in surface boundaries.\n\n\n\t\t\n join - If a surface has several adjacent profiles caused by its intersection with two or more surfaces, the profiles will be joined into a single curve-on-surface.\n\n\n\n\n\n -\n -\n\nExtra Information for the Surfsect can be accessed via an Info CHOP.\n\n\n\n - Number of points in this . - Number of primitives in this . - Number of particles in this . - Time spent in another thread updating geometry data on the from the 's CPU data. As it is part of another thread, this time is not part of the usual frame time. - Time spent in another thread updating meta surface geometry data (such as metaballs or nurbs) on the from the 's CPU data. As it is part of another thread, this time is not part of the usual frame time.\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\nSOPs\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\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\n\n\n\n\n\nRetrieved from \"https://docs.derivative.ca/index.php?title=Surfsect_SOP&oldid=24240\"\n\t\tCategory: SOPs", "tooltip": "", "help": "", "units": "", "examples": [], "isReadOnly": false, "isAdvanced": false, "isHidden": false, "isAnimatable": true, "isExpression": false, "isPython": false, "dependsOn": [], "affects": [], "linkedTo": [], "expressionLanguage": "", "defaultExpression": "", "commonExpressions": [], "order": 0, "isVisible": true, "conditionalDisplay": null, "isValid": true, "validationErrors": [], "lastUpdated": "2025-08-07T07:50:10.153Z", "rawData": {}, "sourceElement": null }, { "id": null, "name": "Group A", "label": "Group A", "group": "General", "page": "", "type": "float", "dataType": "number", "style": "", "defaultValue": null, "minValue": null, "maxValue": null, "step": null, "menuItems": [], "menuLabels": [], "allowCustom": false, "maxLength": null, "pattern": null, "isArray": false, "arraySize": 1, "dimensions": 1, "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 Surfsect performs boolean operations with NURBS and Bezier surfaces, or only generates profiles where the surfaces intersect. The individual surfaces do not need to be solids (i.e. wrap in U and V), nor do they need to form a solid as a group (for example, you can cut a grid with a sphere).\t\t\nThe surfaces in the first input are denoted by \"A\" in the parameter list. The surfaces in the second input are denoted by \"B\". The entire A set is intersected with the B set, which allows for true csg operations with spline surfaces. Thus, if A forms a solid and B forms a solid, any boolean operation between A and B will produce a solid. If either set has an open topology, the result will also be open.\t\t\t\nWhat is deemed to be the inside and outside of a trim region depends on the direction of the surface normals. If necessary, use the Primitive SOP to reverse the surface normals by reversing the surface's U or V direction.\nsurfsectSOP_Class\n\nContents\n \n \n \n \n \n \n \n \n\n\n\n\n\n groupa - Subset of NURBS and Bezier surfaces. Accepts patterns, as described in Pattern Matching.\n\n\n\t\t\t\n groupb - Subset of NURBS and Bezier surfaces to intersect with A. Accepts patterns, as described in Pattern Matching.\n\n\n\t\t\t\n tol3d - World space precision of the intersection.\n\n\n\t\t\t\n tol2d - Domain precision of the intersection.\n\n\n\t\t\t\n step - Number of steps for tracing each profile span.\n\n\n\n\n\nEnables boolean operations between the surfaces in A and B:\n\n boolop - - Select from the following operations: , , , , or .\t\nIf the is set to , the following options become available:\n\n\n union - intersect - aminusb - bminusa - other -\n\t\t\n insidea - Preserve the inside sections of the A surfaces.\n\n\n\t\t\n insideb - Preserve the inside sections of the B surfaces.\n\n\n\t\t\n outsidea - Preserve the outside sections of the A surfaces.\n\n\n\t\t\n outsideb - Preserve the outside sections of the B surfaces.\n\n\n\n\n\nJust create profiles where the surfaces intersect.\n\n target - - Which surface to output profiles for: A, B, or both.\n\n a - b - both -\n\t\t\n creategroupa - Place the A profiles in a user-defined group.\n\n\n\t\t\n profilesa - The name assigned to profile group A.\n\n\n\t\t\n creategroupb - Place the B profiles in a user-defined group.\n\n\n\t\t\n profilesb - The name assigned to profile group B.\n\n\n\t\t\n mindholes - Intersect only the visible surface parts and truncate the intersection profile at the trimmed-in surface boundaries.\n\n\n\t\t\n join - If a surface has several adjacent profiles caused by its intersection with two or more surfaces, the profiles will be joined into a single curve-on-surface.\n\n\n\n\n\n -\n -\n\nExtra Information for the Surfsect can be accessed via an Info CHOP.\n\n\n\n - Number of points in this . - Number of primitives in this . - Number of particles in this . - Time spent in another thread updating geometry data on the from the 's CPU data. As it is part of another thread, this time is not part of the usual frame time. - Time spent in another thread updating meta surface geometry data (such as metaballs or nurbs) on the from the 's CPU data. As it is part of another thread, this time is not part of the usual frame time.\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\nSOPs\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\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\n\n\n\n\n\nRetrieved from \"https://docs.derivative.ca/index.php?title=Surfsect_SOP&oldid=24240\"\n\t\tCategory: SOPs", "tooltip": "", "help": "", "units": "", "examples": [], "isReadOnly": false, "isAdvanced": false, "isHidden": false, "isAnimatable": true, "isExpression": false, "isPython": false, "dependsOn": [], "affects": [], "linkedTo": [], "expressionLanguage": "", "defaultExpression": "", "commonExpressions": [], "order": 0, "isVisible": true, "conditionalDisplay": null, "isValid": true, "validationErrors": [], "lastUpdated": "2025-08-07T07:50:10.154Z", "rawData": {}, "sourceElement": null }, { "id": null, "name": "Group A", "label": "Group A", "group": "General", "page": "", "type": "float", "dataType": "number", "style": "", "defaultValue": null, "minValue": null, "maxValue": null, "step": null, "menuItems": [], "menuLabels": [], "allowCustom": false, "maxLength": null, "pattern": null, "isArray": false, "arraySize": 1, "dimensions": 1, "description": "The Surfsect performs boolean operations with NURBS and Bezier surfaces, or only generates profiles where the surfaces intersect. The individual surfaces do not need to be solids (i.e. wrap in U and V), nor do they need to form a solid as a group (for example, you can cut a grid with a sphere).\t\t\nThe surfaces in the first input are denoted by \"A\" in the parameter list. The surfaces in the second input are denoted by \"B\". The entire A set is intersected with the B set, which allows for true csg operations with spline surfaces. Thus, if A forms a solid and B forms a solid, any boolean operation between A and B will produce a solid. If either set has an open topology, the result will also be open.\t\t\t\nWhat is deemed to be the inside and outside of a trim region depends on the direction of the surface normals. If necessary, use the Primitive SOP to reverse the surface normals by reversing the surface's U or V direction.\nsurfsectSOP_Class\n\nContents\n \n \n \n \n \n \n \n \n\n\n\n\n\n groupa - Subset of NURBS and Bezier surfaces. Accepts patterns, as described in Pattern Matching.\n\n\n\t\t\t\n groupb - Subset of NURBS and Bezier surfaces to intersect with A. Accepts patterns, as described in Pattern Matching.\n\n\n\t\t\t\n tol3d - World space precision of the intersection.\n\n\n\t\t\t\n tol2d - Domain precision of the intersection.\n\n\n\t\t\t\n step - Number of steps for tracing each profile span.\n\n\n\n\n\nEnables boolean operations between the surfaces in A and B:\n\n boolop - - Select from the following operations: , , , , or .\t\nIf the is set to , the following options become available:\n\n\n union - intersect - aminusb - bminusa - other -\n\t\t\n insidea - Preserve the inside sections of the A surfaces.\n\n\n\t\t\n insideb - Preserve the inside sections of the B surfaces.\n\n\n\t\t\n outsidea - Preserve the outside sections of the A surfaces.\n\n\n\t\t\n outsideb - Preserve the outside sections of the B surfaces.\n\n\n\n\n\nJust create profiles where the surfaces intersect.\n\n target - - Which surface to output profiles for: A, B, or both.\n\n a - b - both -\n\t\t\n creategroupa - Place the A profiles in a user-defined group.\n\n\n\t\t\n profilesa - The name assigned to profile group A.\n\n\n\t\t\n creategroupb - Place the B profiles in a user-defined group.\n\n\n\t\t\n profilesb - The name assigned to profile group B.\n\n\n\t\t\n mindholes - Intersect only the visible surface parts and truncate the intersection profile at the trimmed-in surface boundaries.\n\n\n\t\t\n join - If a surface has several adjacent profiles caused by its intersection with two or more surfaces, the profiles will be joined into a single curve-on-surface.\n\n\n\n\n\n -\n -\n\nExtra Information for the Surfsect can be accessed via an Info CHOP.\n\n\n\n - Number of points in this . - Number of primitives in this . - Number of particles in this . - Time spent in another thread updating geometry data on the from the 's CPU data. As it is part of another thread, this time is not part of the usual frame time. - Time spent in another thread updating meta surface geometry data (such as metaballs or nurbs) on the from the 's CPU data. As it is part of another thread, this time is not part of the usual frame time.\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\nSOPs\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\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\n\n\n\n\n\nRetrieved from \"https://docs.derivative.ca/index.php?title=Surfsect_SOP&oldid=24240\"", "tooltip": "", "help": "", "units": "", "examples": [], "isReadOnly": false, "isAdvanced": false, "isHidden": false, "isAnimatable": true, "isExpression": false, "isPython": false, "dependsOn": [], "affects": [], "linkedTo": [], "expressionLanguage": "", "defaultExpression": "", "commonExpressions": [], "order": 0, "isVisible": true, "conditionalDisplay": null, "isValid": true, "validationErrors": [], "lastUpdated": "2025-08-07T07:50:10.156Z", "rawData": {}, "sourceElement": null }, { "id": null, "name": "Group A", "label": "Group A", "group": "General", "page": "", "type": "float", "dataType": "number", "style": "", "defaultValue": null, "minValue": null, "maxValue": null, "step": null, "menuItems": [], "menuLabels": [], "allowCustom": false, "maxLength": null, "pattern": null, "isArray": false, "arraySize": 1, "dimensions": 1, "description": "groupa - Subset of NURBS and Bezier surfaces. Accepts patterns, as described in Pattern Matching.", "tooltip": "", "help": "", "units": "", "examples": [], "isReadOnly": false, "isAdvanced": false, "isHidden": false, "isAnimatable": true, "isExpression": false, "isPython": false, "dependsOn": [], "affects": [], "linkedTo": [], "expressionLanguage": "", "defaultExpression": "", "commonExpressions": [], "order": 0, "isVisible": true, "conditionalDisplay": null, "isValid": true, "validationErrors": [], "lastUpdated": "2025-08-07T07:50:10.156Z", "rawData": {}, "sourceElement": null }, { "id": null, "name": "Group B", "label": "Group B", "group": "General", "page": "", "type": "float", "dataType": "number", "style": "", "defaultValue": null, "minValue": null, "maxValue": null, "step": null, "menuItems": [], "menuLabels": [], "allowCustom": false, "maxLength": null, "pattern": null, "isArray": false, "arraySize": 1, "dimensions": 1, "description": "groupb - Subset of NURBS and Bezier surfaces to intersect with A. Accepts patterns, as described in Pattern Matching.", "tooltip": "", "help": "", "units": "", "examples": [], "isReadOnly": false, "isAdvanced": false, "isHidden": false, "isAnimatable": true, "isExpression": false, "isPython": false, "dependsOn": [], "affects": [], "linkedTo": [], "expressionLanguage": "", "defaultExpression": "", "commonExpressions": [], "order": 0, "isVisible": true, "conditionalDisplay": null, "isValid": true, "validationErrors": [], "lastUpdated": "2025-08-07T07:50:10.156Z", "rawData": {}, "sourceElement": null }, { "id": null, "name": "3D Tolerance", "label": "3D Tolerance", "group": "General", "page": "", "type": "float", "dataType": "number", "style": "", "defaultValue": null, "minValue": null, "maxValue": null, "step": null, "menuItems": [], "menuLabels": [], "allowCustom": false, "maxLength": null, "pattern": null, "isArray": false, "arraySize": 1, "dimensions": 1, "description": "tol3d - World space precision of the intersection.", "tooltip": "", "help": "", "units": "", "examples": [], "isReadOnly": false, "isAdvanced": false, "isHidden": false, "isAnimatable": true, "isExpression": false, "isPython": false, "dependsOn": [], "affects": [], "linkedTo": [], "expressionLanguage": "", "defaultExpression": "", "commonExpressions": [], "order": 0, "isVisible": true, "conditionalDisplay": null, "isValid": true, "validationErrors": [], "lastUpdated": "2025-08-07T07:50:10.156Z", "rawData": {}, "sourceElement": null }, { "id": null, "name": "2D Tolerance", "label": "2D Tolerance", "group": "General", "page": "", "type": "float", "dataType": "number", "style": "", "defaultValue": null, "minValue": null, "maxValue": null, "step": null, "menuItems": [], "menuLabels": [], "allowCustom": false, "maxLength": null, "pattern": null, "isArray": false, "arraySize": 1, "dimensions": 1, "description": "tol2d - 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