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"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.
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