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"Trevor Quayle" <Tin### [at] hotmail com> wrote in message
news:3bd05a6b@news.povray.org...
> Both images are exactly the same, except the second has a visible light
> source (i.e., high ambient sphere)
> material:
>
> material{
> texture{
> pigment{rgb <0,0,1>}
> finish{
> conserve_energy
> ambient 0
> diffuse 0
> reflection {
> 0 1
> fresnel on // fresnel on yet no transparency used??
> }
> }
} // missed a brace here
> interior{
> ior 1.1335
> }
> }
>
>
> You can see a round spot in the middle of the sphere at which the
reflection
> fading stops completely and there is no more reflection.
> In the second image, I used a high ambient sphere that would reflect
> slightly larger than the spot. Now you can see the black spot very
clearly.
> I do understand about colour clipping but I don't think this is applicable
> here. I just wanted to know if it is a limitation of number accuracy or if
> is intended to act that way (i.e., ignore reflection fading below a
certain
> threshold) and if this is the case is there a way to alter this threshold?
I tried this myself and saw only a smooth fade-out into the center of the
reflection, no global settings changes made such as max trace or adc bailout
needed.
Bob H.
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