"Kynar" <kyn### [at] homexpresswaynet> wrote in message
news:3cf36f09$1@news.povray.org...
>
> First, the initial path from the source to the first mirror shows as
> expected for the spotlight.  This portion of the light path is missing
from
> the cylinder light version.
>
> Second, both the spotlight and cylinder light versions show what seems to
be
> the presence of a beam along the optical axis of the light source.

First of all, cylinder light sources act a bit differently. So, try the
following in place of that:

// cylindrical laser lite
light_source {
  <150,0,0>, color rgb <0,1,0> *15*100
 // spotlight // not needed
  cylinder
  parallel // goes ahead of point_at
  point_at 0
  radius 1/2*9
  falloff 1/2*9
  tightness 1
  media_attenuation off
  photons {
    refraction off
    reflection on
  }
}

Secondly... well, admittedly, I don't know what's going on with that axial
anomaly but it's very possible it could just be a matter of media and/or
photon settings. Although, I couldn't get it to go away in the short time I
was attempting to try other numbers and such.

BTW, default media method 3 is supposed to work best when using intervals 1
and more will automatically be used if needed. Also, sampling isn't
"adaptive" unless the minimum 'samples' is 3 or more; it ignores the max
value.

bob h

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