I'm trying to recreate the lines as shown on the attached image, without having to manually draw/trace them.

My initial idea was to Interpolate Sub-Paths between a straight and a curved path. I have combined them before applying the path effect (the second attachment).

However, the effect produces unexpected results. Where I'd expect to see a smooth transition between the straight and the curved line, I instead get a series of strange looking lines (the third attachment). They are both much narrower and curved than either of the two originating lines. Depending on number of steps I select, they even coil sometimes.

I'm not sure if I'm using the appropriate tool for this, or if I'm using the effect properly. Any idea what I can do to achieve smooth transition as on the first image?

Thanks.

For more predictable results, I'd ensure the sub-paths have the same number and type of nodes, and are going the same direction.

First off thank you for your quick reply.

I tried what you suggested and it works. Albeit, it takes some time and effort.

If anyone else is looking for something similar in the future, I ultimately went with what I think is quicker and easier action: Extensions > Generate from Path > Interpolate. Works like a charm, no need to divide the paths, no need even to combine them.

Cheers,

THX