This new star primitive looks promising. Thank you for the code sample, I will try to use .fromAngleRadians().

My code (obj2jscad) only reads a very simple OBJ file (only triangular without normals or textures) and take use of its facets materials groups. Materials are described into another file that I don't use but it could be done to read colors as materials simplest expression can be colors. True OBJ format is much more complex than that.

Of course, you can use the STL design to subtract from another design. Is that not accurate enough for your needs? Measuring from point to point, or across a design isn’t possible. But you can always take a small slice of a design, and measure that using bounds.