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TouchDesigner MCP Server v2.8.0 - 21 MCP tools, 629 operators with clean parameter data, 69 Python API classes, 14 tutorials, 32 workflow patterns. Includes version system, experimental techniques KB, core tool enhancements, and experimental build support
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{
"id": "fit_sop",
"name": "Fit SOP",
"displayName": "Fit SOP",
"category": "SOP",
"subcategory": "Generators",
"version": "",
"lastUpdated": "2025-08-07T07:50:00.989Z",
"sourceFile": "C:\\Program Files\\Derivative\\TouchDesigner\\Samples\\Learn\\OfflineHelp\\https.docs.derivative.ca\\Fit_SOP.htm",
"url": "",
"description": "The Fit SOP fits a Spline curve to a sequence of points or a Spline surface to an m X n mesh of points.",
"summary": "The Fit SOP fits a Spline curve to a sequence of points or a Spline surface to an m X n mesh of points.",
"details": "",
"usage": "",
"tips": [],
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"parameters": [
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"description": "If there are input groups, specifying a group name in this field will cause this to act only upon the group specified.",
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"description": "method - - Specifies one of two fitting styles: approximation or interpolation. Each style has a number of parameters that are accessible from the respective folder. For more information see the Approximation and Interpolation pages below.\n\n approx - interp -",
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"description": "approx - interp -",
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"name": "Primitive Type",
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"description": "type - - The output of the Fit is a NURBS or Bzier primitive. All input faces are fitted to Spline curves, and all input surfaces are fitted to spline surfaces. The resulting shapes are identical whether created as NURBS or as Bzier primitives.\n\n nurbs - bezier -",
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"description": "nurbs - bezier -",
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"name": "Connectivity",
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"description": "surftype - - This option is used to select the type of surface, when using a Mesh Type.\n\n rows - Creates horizontal lines. cols - Creates vertical lines. rowcol - Both Rows and Columns. Looks like Quads in wire frame display, but all polygons are open (if the primitive type is polygon). triangles - Build the grid with Triangles. quads - Generates sides composed of quadrilaterals (default). alttriangles - Generates triangles that are opposed; similar to the Triangles option.",
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"description": "rows - Creates horizontal lines. cols - Creates vertical lines. rowcol - Both Rows and Columns. Looks like Quads in wire frame display, but all polygons are open (if the primitive type is polygon). triangles - Build the grid with Triangles. quads - Generates sides composed of quadrilaterals (default). alttriangles - Generates triangles that are opposed; similar to the Triangles option.",
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"name": "U Order",
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"description": "orderu - If the input is a face, this is the order of the Spline curve to be generated. If the input is a surface, this is the order of the fitted spline surface in the U parametric direction.",
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"description": "orderv - If the input is a surface, this is the order of the fitted Spline surface in the V parametric direction. The V order is irrelevant if the input is a face.",
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"description": "tol - This is the primary precision factor in approximation fitting. The smaller the tolerance, the closer the fit and the higher the number of generated vertices. If a small tolerance causes unwanted twists or contortions in the fitted primitive, it may help to vary the Spline order and/or enable the Multiple Knots flag.",
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"description": "smooth - For a set tolerance, the smoothness factor allows for more or less roundness in the generated shape. If this parameter is zero, it does not mean that the fit will be sharp. It simply indicates that no additional smoothing is required past the level of smoothness already achieved with the given tolerance.",
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"description": "multipleu - Sometimes the data set has sharp bends that must be preserved in the fitted shape. In this case, inserting multiple knots in the areas of sharp curvature will usually produce the right effect. Sometimes, however, the simulated sharpness induces unwanted twists immediately before or after the corner. Lowering the Spline order and/or reducing the tolerance may help diminish this side-effect.",
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"description": "multiplev - Sometimes the data set has sharp bends that must be preserved in the fitted shape. In this case, inserting multiple knots in the areas of sharp curvature will usually produce the right effect. Sometimes, however, the simulated sharpness induces unwanted twists immediately before or after the corner. Lowering the Spline order and/or reducing the tolerance may help diminish this side-effect.",
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"name": "Scope",
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"description": "scope - - establishes the interpolation method.\n\n global - Global interpolation take the whole data set into account at once and generates exactly as many CVs as data points is it given. local - Local interpolation takes a more geometric approach, building the curve or surface one span at a time, using only local data at each step. The local method generates more CVs than the number of data points it is given, but it usually yields a tighter fit than the global method. The local approach is also less computationally expensive than the global one, and handles cusps and local perturbations better. Local interpolation is available only for curves. breakpnt - Breakpoint interpolation is a variant of global interpolation that satisfies the requirement that the locations of data points coincide with the breakpoints of the generated curve. The breakpoints of a Spline curve are the image of the Spline basis on the curve. Breakpoint interpolation is available only for curves.",
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"description": "global - Global interpolation take the whole data set into account at once and generates exactly as many CVs as data points is it given. local - Local interpolation takes a more geometric approach, building the curve or surface one span at a time, using only local data at each step. The local method generates more CVs than the number of data points it is given, but it usually yields a tighter fit than the global method. The local approach is also less computationally expensive than the global one, and handles cusps and local perturbations better. Local interpolation is available only for curves. breakpnt - Breakpoint interpolation is a variant of global interpolation that satisfies the requirement that the locations of data points coincide with the breakpoints of the generated curve. The breakpoints of a Spline curve are the image of the Spline basis on the curve. Breakpoint interpolation is available only for curves.",
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"description": "dataparmu - - Specifies the parameterization of the data in the U direction (the only direction if the input is a curve). The data parameterization can be uniform, chord length, or centripetal.\t\nUniform Uniform parameterization uses equally spaced parameter values. It works best when the geometry is very regular. When the data is unevenly spaced, this approach can produce very unintuitive shapes, and is not recommended.\nChord Length Chord length computes the parameterization of the data based on the relative distances between successive data points. It is the most commonly used approach because is tends to produce the most accurate results.\nCentripetal Centripetal parameterization is similar to chord length, but yields better results when the data has very sharp corners.\n uniform - chrdlen - centrip -",
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"description": "dataparmv - - V data parameterization is identical to U data parameterization, but it affects the V direction when the input is a surface. It is not used when the input is a face.\n\n uniform - chrdlen - centrip -",
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