Hi Francesco,
The rendering process with Povray does not include the regular 3D labels, only 2D labels.  Usually the 3D labels are not so great for figures anyway, although I understand it is more work to add 2D labels.
<https://www.rbvi.ucsf.edu/chimera/docs/ContributedSoftware/2dlabels/2dlabels.html>

Personally, because of the many limitations of the Chimera-to-Povray process
<https://www.rbvi.ucsf.edu/chimera/docs/UsersGuide/raytracing.html#limitations>

...I avoid using it.  I can get a much better appearance just with Chimera rendering. You can turn on shadows in Chimera, for example, with command:

set shadows

<https://www.rbvi.ucsf.edu/chimera/docs/UsersGuide/midas/set.html#shadows>

... and there are other commands (or you can use the Lighting tool) to increase shininess and get other effects.  See "image tips"
<https://www.rbvi.ucsf.edu/chimera/docs/UsersGuide/print.html#tips>

I hope this helps,
Elaine
-----
Elaine C. Meng, Ph.D.                       
UCSF Chimera(X) team
Department of Pharmaceutical Chemistry
University of California, San Francisco

> On Aug 26, 2022, at 2:33 AM, Francesco Pietra via Chimera-users <chimera-users@cgl.ucsf.edu> wrote:
>
> Hello
> In my hands, with CHIMERA (v 1.15 Linux64 X11),  POV-RAY rendering does not reproduce labels, only an interrogation mark in their place.
>
> Thanks for advice
>
> francesco pietra