FlowLine - How to get the exact location of the current drawing step in color function?

[downace]

Looks like the color function is called only for visible segments, but the step value is always in [0,1] range, so it's not consistent and can't be used to identify the exact location on the map.

Reproduction: https://codesandbox.io/p/sandbox/hnvgwt

Reproduction GIF

As a workaround I could use visible: false (FLowLine) and updateWhileAnimating: true (VectorLayer), but

the setting will have a performance impact for large amounts of vector data.

[Viglino]

Yes, it is an optimization to calculate only on visible part. visible: false will use the whole geometry but is less efficient...