Select a spline object. > Modify panel > Modifier List > Patch/Spline Editing > Normalize Spl.
Select a spline object. > Modifiers menu > Patch/Spline Editing > Normalize Spline
The Normalize Spline modifier adds new control points in the spline at regular intervals. Use Normalize Spline to produce splines for motion paths that require constant velocity.
Note: This feature is not animatable.
Interface
Seg Length: Determines how many control points are added. Smaller values produce more control points; larger values produce fewer.
The positions of the original vertices are disregarded. Vertices are set to regular intervals once the Normalize Spline modifier is applied.