Am 27.02.2016 um 17:17 schrieb William F Pokorny:

> Christoph,
>
> I think it has something to do with the light type.
>
> // <--- Fails 3.7.1-alpha.8454683 Ubuntu 14.04  (OK with 3.7.0-stable)
> // light_source {<-150, 0.5, 0>, color rgb < 1.2, 1, 1.5>
> //     spotlight radius 0.3 falloff 0.35 point_at < 0, 0.5, 0>
> //     photons {refraction on reflection on}
> // }
> // <--- OK Ubuntu 14.04 3.7.0 & 3.7.1
>     light_source {<-150, 0.5, 0>, color rgb < 1.2, 1, 1.5>
>         photons {refraction on reflection on}
>     }
>
> Perhaps someone else can verify ?

Tried it...

Yes. The resulting image differs, bit still not right.

I've attached my rendering.

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