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"Kontemplator" <haf### [at] yahoocom> wrote:
> "Motive17" <nomail@nomail> wrote:
> > Good morning to all,
> >
> > I'm focusing on a quite strange issue.
> >
> > I have simply defined this light source:
> >
> > light_source {
> > <0,500,-1000>
> > color rgb <255, 255, 255>
> > fade_distance 1
> > fade_power 0
> > media_interaction off
> > media_attenuation off
> > }
> >
> > and this object:
> >
> > cylinder {
> > <0, 0, 1000>,
> > <0, 1000, 1000>,
> > (100)
> > pigment {rgb <0, 0, 0>}
> > finish {
> > ambient 0
> > diffuse 1
> > specular 1
> > emission 0
> > roughness 0.005
> > reflection {
> > 0.5
> > metallic
> > }
> >
> > then, gradually I'm moving the light source until z=-100000, leaving the camera
> > fixed:
> >
> > camera {
> > perspective
> > location <0,500,0>
> > look_at <0,500,1000>
> > rotate <0, 0, 0>
> > up <0,2,0>
> > right <2,0,0>
> > }
> >
> > The strange issue is relative to the behaviour of the light reflected by the
> > cylinder. It seems to increase when I increase the distance between object and
> > light source. Why? There is any light attenuation defined.
> >
> > Anyone have an idea about that?
> >
> > Thank you
> >
> > Best regard
>
> Try a parallel light and the effect vanish. If I use a spotlight, the visible
> radius increase with the distance to the object. Same for the point
> light_source.
I don't know...
I've just tried it but it is still different.
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