These scene-view tools allows the creations and manipulation of data points along the spline

You can access them, by selecting the Spline Mesher component object. After which, such options will appear:

Index unit

You’ll find the option to specify this at the top of the inspector:

This determines how the position of the data points are interpreted along the curve.

For example:
– If a scale adjustment at the tip of a spline needs to remain at it‘s tip, the “Normalized” type is used.
– Should it stay exactly where it was placed in the world, the “Distance” type works best.