MRe napsal(a):
> Hi
> 
> tried to generate a 'white laser beam' through a prism (black sourrounding,
> windows xp) watching for the dispersion (Factor 1.5, samples 15). The laser
> beam should be visible by scattering in a dusty air media. Unfortunately the
> laser beam generated by a spot light is only visible before hitting the prism
> surface but not visible after passing the prism. Any ideas why this happens? I
> have only one air media specified with IOR=1, scattering on, mie hazy,
> extinction 0.1, scattering color grey 0.86 lum.
> The beam should be light enough to show at least some scattering. Any ideas what
> to improve?
> 
> Thanks MRe
> 
> 
see photons in the documentation.

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