How to use TopoSeries?

[SuzanneSoy]

I'm trying to attach copies of the sketch Feature (the trapezium at the top) to some of the edges of another sketch (Path just below). I'm expecting to obtain the shape on the right (in my actual use case, I'd only select a subset of the edges). The Feature sketch has 4 degrees of freedom, which allow placing both its endpoints and it will stretch as needed. The use case is to add gluing tabs for a model made out of paper.

I tried to click TopoSeries after selecting the Feature and the Edges of Path (made with the Downgrade to Edges tool). I also tried to click TopoSeries after selecting the Feature and the Array from Edges of Path (made with Downgrade to Edges → Array from shape: internal placements with orient mode = child.Edge and Translate mode = child.Vertex)

In both cases, I get this message:

Error:
In supplied links, nothing to loop over compounds was found. Key-by-key errors follow:

How is the TopoSeries tool supposed to be used? I tried looking for documentation but couldn't find any example.

Here's the FreeCAD document in the screenshot: test_lattice2_toposeries.FCStd.zip

I just discoved Lattice2 and it seems very useful so far :)

[DeepSOIC]

Hi! I'm sorry I still haven't written a tutorial for this tool, it is not easy to figure out.

The sketch "feature" must be based on "Edges of Path" (one or several; preferably on Edge1). Then to do the toposeries, you select "Feature" and "Edges of Path" and click "Toposeries". That's it.

However, since TopoSeries actually modifies the external-geometry links of the sketch in order to compute the occurrences, doing it the straightforward way usually results in a collapsed sketch at some step. Attaching the sketch to the linked edge can grealy improve the odds of solver success, which is what i did in the example file below. TopoSeries will loop the attachment link as well.

test_lattice2_toposeries_done.FCStd.zip

"Array from Edges of Path" in your file is not needed and is not helpful for toposeries.