@pbacot said:
sasra Please attach the SketchUp file. In the example picture I don't see a straight line. You need (1) a shape, (2) a straight line, and (3) the curved path, all set up in relation to the axes as in all the examples. I can't tell by the picture.
here's the skp file (in 2017 ver)
the sraight line is actually under the shape