Curve Parameter Node
The Curve Parameter node outputs how far along each spline a control point is, with a value between zero and one. The output is different from dividing the index by the total number of control points, because the control points might not be equally spaced along the curve.
The first value is zero, so the output corresponds to the length at the control point rather than including the length of the following segment.
When used on the spline domain, the node outputs the portion of the total length of the curve (including all splines) has been traversed at the start of each spline. The order of the curve’s splines is visible in the Spreadsheet Editor.
For NURBS and Bézier spline curves, keep in mind that the value retrieved from this node is the value at every control point, which may not correspond to the visible evaluated points. For NURBS splines the difference may be even more pronounced and the result may not be as expected. A Resample Curve Node node can be used to create a poly spline, where there is a control point for every evaluated point.
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The portion of the total length of the spline at each control point.
The parameter used to control the radius of the curve. The beginning of the spline has a radius of 0, the end has a radius of 1.