.. _auto_curves_catmul_rom_spline:

*GENERATE A CATMUL-ROM-SPLINE FOR ALL CURVES*
=============================================

Fits a Catmull-Rom spline through all input curves and resamples each to a uniform set of interpolated points. Use this worker to smooth or densify curves while preserving passage through the original control points.

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

Classification: **process**.

Tagged: ``catmull-rom``, ``curve-smoothing``, ``interpolation``, ``resampling``, ``spline``.

Inputs
------

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

   * - Label
     - ID
     - Type
     - Default
     - Required
     - Description
   * - Curve In
     - curve_in
     - vector
     - —
     - 
     - One or more input curves (x/y vector pairs) to be fitted with the Catmull-Rom spline; accepts multiple curves in a single batch.
   * - Number For Points
     - number_of_points
     - scalar
     - 100
     - 
     - Number of evenly-spaced output points to generate along the fitted spline per curve; defaults to 100 — increase for smoother resolution, decrease for lighter output.
   * - Alpha
     - alpha
     - scalar
     - 0.5
     - 
     - Catmull-Rom parameterisation exponent: 0.0 = uniform, 0.5 = centripetal (default, recommended for most curves), 1.0 = chordal.
   * - Skip Negative
     - skip_negative
     - scalar
     - yes
     - 
     - Whether to exclude negative x/y values when constructing the spline ('yes' / 'no'); defaults to 'yes' — set to 'no' if the curve legitimately contains negative values.

Outputs
-------

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

   * - Label
     - ID
     - Type
     - Description
   * - curves_catmul_rom_spline_output_1
     - curves_catmul_rom_spline_output_1
     - vector
     - Resampled curves after Catmull-Rom spline fitting, returned as a vector collection with the same curve count as the input but at the requested number of points.

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

- data.curve.transform

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

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

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   Auto-generated from <code>transformation</code> schema. Worker id: <code>curves_catmul_rom_spline</code>. Schema hash: <code>4eb3465af9b7</code>. Hand-curated docs in <code>workerexamples/</code> override this page when present.
   </p>