On 04/29/2018 08:12 AM, jhennesy wrote:
> I've been trying to produce a scene with a laser illuminating a solid sample
> from above. The laser is focused with a lens onto the sample surface. The laser
> itself is implemented as a cylindrical light source with refraction and
> reflection on, and scattering turned on in global medium to enable me to see the
> laser.
...
> 

I'm short on time at seeing this post so unable to run your scene, but 
the normal set up with photons is for the media to be inside a clear, 
hollow container with an interior defining media. The container would 
specify 'photons {target}' to get the photons shot into the media.

You've got global media and what you see is I believe the normal media 
to light scatterings - not the forward photon interaction type.

There is an 'optics.pov' scene shipped with POV-Ray. It has a few minor 
issues - mostly from trying to be fast I suspect - but it adequately 
demonstrates a photons and media set up.

Bill P.

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