Hi Burr, yeah several different things relating to IGES may not be expecting to work with a single solid getting joined up made up of multiple different colors within it.

Currently when MoI writes out an IGES file it will only write out the single color assigned to the parent object and not colors for individual sub-objects within a joined solid.

Maybe I can look at tweaking this in the future but I'm not so sure that you're going to find it widely supported to get a solid joined result that still has those different colored faces within it.


Having faces with individual colors within a single object is more widely supported in mesh formats so that does work fine with OBJ or LWO exports.

- Michael