> Do you have a radiosity block?

Yes.

> With radiosity ambient 0 means an object doesn't emit light,

Ambient 0 is recommended when using radiosity, no?

> do you have other objects with higher abmbient as a light source,
> with an HDRI image map?
> Background and sky_sphere are an infinite distance so you'd
> be better off using a large inverted sphere to provide a light.

I'm already using a large sphere with an HDRI image map instead of
sky_sphere. This shpere has ambient >0, hence it functions as a light
source.

BWT, I'm using MegaPov, since Povray 3.6 doesn't support HDRI.

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