yesbird wrote:
> On 13/10/2025 19:58, Kenneth wrote:
> > YES, that worked; and thanks for that cube object, ...
>
> I've just
> reversed vertices order, and it works fine now (check it, please).

YES, both the smooth and flat versions render correctly now; the outsides and
insides are where they should be! Excellent.
>
>
> 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.

Ah yes, I understand now. For my own purposes, I will just delete the unions.

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For your 'materials', are you using your own creations? I would suggest using
the standard textures that come with POV-ray instead, available in its 'include'
folder (perhaps in 'textures.inc', 'glass.inc', etc.)  For example, your
'M_yellow_green_gloss' material is not included in POV-ray as far as I can tell,
and could be confusing to a user when first trying to render the mesh2. (It also
causes an error.)

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