meshugger is a slightly advanced mesh editor for/in construct whose primary cool feature is being able to rotate the mesh. in this regard, it is also an (undocumented and early) demo on how to do that. it exports .mesh files as well as .csv files (details in the readme). cap included.
download meshugger v1
although meshugger is already very usable, there are a few things that could be done better, notably: the rotation being absolute, using simple euler angles (relative rotation would be cooler) & its dependency on .csv-files (it is possible to use .mesh files for everything, but i didn't notice until recently). i hope it is still of use to someone (even though the event sheet is rather large); in any case, i'll probably improve on it in the future.