Hi Peer,

re:
> That would allow things like switching between mm and inches without messing up the annotations.

That opens up some other problems though. Like if you now draw a new dimension after the unit system change the new one will have different sized arrowheads than the ones that were created before the unit system change. Even though you never modified any arrowhead properties directly.

I think that's why Rhino/AutoCAD doesn't scale these properties for transforms, because they want the sizes to be controlled by a dimstyle and not have different values for individual objects unless an override is specifically set up.

In Rhino it appears that a text annotation object will scale its height for transforms but other dimensions do not.

I'll have to see how some other apps behave.

- Michael