How to extrude skRegularPolygon ?

Hi @frederik_larsen108

The psuedocode for what you're trying to do will look something like this:

var sketch = newSketch(context, id + "sketch", { ... }); // or newSketchOnPlane, doesn't really matter.
skRegularPolygon(sketch, "polygon", { ... });
skSolve(sketch);

opExtrude(context, id + "extrude", {
    "entities" : qSketchRegion(id + "sketch"), // notice the matching id + "sketch" here and above
    ...
});

As a general rule FeatureScript functions which create geometry do not return the geometry they create.  You get at the geometry they create by constructing a Query. Queries are constructed using functions that look like q<Something>().

https://cad.onshape.com/FsDoc/modeling.html
https://cad.onshape.com/FsDoc/library.html#module-query.fs
https://cad.onshape.com/FsDoc/library.html#qNothing

Another random Query example:

// All the solid bodies in the part studio except the bodies created by the feature whose id is (id + "extrude1")
qSubtraction(qBodyType(qEverything(EntityType.BODY), BodyType.SOLID), qCreatedBy(id + "extrude1", EntityType.BODY));