On 13/10/2025 19:58, Kenneth wrote:
> YES, that worked; and thanks for that cube object, ...

Always welcome, now this testing cube is available at [1] button.

> Anyway, at least *part* of the mystery has been cleared up :-D

The answer is simple: order of vertices define normal direction.
When normals specified, they overwrite this calculation. I've just
reversed vertices order, and it works fine now (check it, please).

> In my opinion, the 'union' at the end of the converted file(s) is not really
> necessary, nor is the 'part1' object there. The converted .inc file by itself
> would be easier to render in one of our scenes, just by #including it there.

I am using unions to reflect the structure of the original scene for
technical purposes. Using objects is necessary for materials assignment
to different parts (meshes) of complex models. But if you see an
alternative and better solution, please share your thoughts.
--
YB

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