.. _auto_curve_catmul_rom_spline:

*GENERATE A CATMUL-ROM-SPLINE FOR CURVE*
========================================

Fits a Catmull-Rom spline to an input curve, producing a smoothed version with a configurable number of interpolated points. Use this worker to resample or smooth noisy curves while preserving the original shape through the control points.

When to use
-----------

Classification: **process**.

Tagged: ``"``, ``-``, ``]``, ``a``, ``c``, ``e``, ``f``, ``g``.

Inputs
------

.. list-table::
   :header-rows: 1
   :widths: 20 20 20 20 20 20

   * - Label
     - ID
     - Type
     - Default
     - Required
     - Description
   * - Curve In
     - curve_in
     - vector
     - —
     - 
     - Input curve (x/y vector) to be smoothed; this serves as the set of control points through which the Catmull-Rom spline is fitted.
   * - Number For Points
     - number_of_points
     - scalar
     - 100
     - 
     - Total number of evenly-spaced points to evaluate on the output spline; default is 100 — increase for higher resolution, decrease for coarser output.
   * - Alpha
     - alpha
     - scalar
     - 0.1
     - 
     - Catmull-Rom alpha parameter controlling spline parameterisation: 0 = uniform, 0.5 = centripetal (recommended), 1 = chordal; default is 0.1.
   * - Skip Negative
     - skip_negative
     - scalar
     - yes
     - 
     - When set to 'yes' (default), negative y-values are excluded before constructing the spline — useful for physical quantities that cannot be negative (e.g. force, displacement magnitude).
   * - Skip Sharp Transitions
     - skip_sharp_transitions
     - scalar
     - yes
     - 
     - When set to 'yes' (default), points that form abrupt slope discontinuities are omitted to prevent oscillation artefacts in the fitted spline.

Outputs
-------

.. list-table::
   :header-rows: 1
   :widths: 20 20 20 20

   * - Label
     - ID
     - Type
     - Description
   * - curve_catmul_rom_spline_output_1
     - curve_catmul_rom_spline_output_1
     - vector
     - Smoothed output curve (x/y vector) evaluated at the requested number of points along the fitted Catmull-Rom spline.

Disciplines
-----------

- data.curve.transform
- data.signal_processing

Runnable example
----------------

A runnable example is registered for this worker. Open the example workflow on the d3VIEW canvas: `/api/workflow/example?id=curve_catmul_rom_spline <https://www.d3view.com/api/workflow/example?id=curve_catmul_rom_spline>`_

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   Auto-generated from <code>transformation</code> schema. Worker id: <code>curve_catmul_rom_spline</code>. Schema hash: <code>9bcc25932d0a</code>. Hand-curated docs in <code>workerexamples/</code> override this page when present.
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