Hi Steve,
> There must be some difference, or some missing export/save from MoI to 3dm?
Yup, MoI does not write a thumbnail image to the header of the .3dm file - that embedded thumbnail image must be present for that Rhino viewer to work.
So that's the part that I would add - to embed thumbnail images into the .3dm file when MoI writes them.
- Michael
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