I tried negative numbers on ior and got some strange results... Anyone care
to explain?

Ambis

/*  Code... pov 3.1g  */

global_settings { max_trace_level 30 }

light_source {<2,2,2>,rgb 1}
light_source {<0,0,0>,rgb 2}

camera {
   location <2,2,2>
   look_at  <0,0,0>
}




#declare Epfinish =
        texture {
                pigment {rgbt <0,0,0,1>}
                finish { ambient 0 diffuse 0 }
                 }

#declare Etexture =
texture {Epfinish}


#declare EMaterial =
material {
 texture { Etexture }
 interior {ior 1 }
/* interior {ior 0 }       /* Why did the sphere diapear here */
/* interior {ior -1 }      /* What happens here, it looks weird   */
/* interior {ior -10 }     /* What happens here, it looks weird   */
/* interior {ior -100 }    /* What happens here, it looks weird   */
 }



sphere { <0,0,0>,1
   material { EMaterial }
   hollow }

plane {z,-4 pigment {checker  rgb 0, rgb 1}}
plane {x,-4 pigment {checker  rgb 0, rgb 1}}
plane {y,-4 pigment {checker  rgb 0, rgb 1}}
cylinder {<-4,-4,-4><4,-4,-4>,.5 pigment {checker  rgb 0, rgb 1 scale .5}}
cylinder {<-4,-4,-4><-4,4,-4>,.5 pigment {checker  rgb 0, rgb 1 scale .5}}
cylinder {<-4,-4,-4><-4,-4,4>,.5 pigment {checker  rgb 0, rgb 1 scale .5}}

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AC wrote:
> 
> I tried negative numbers on ior and got some strange results... Anyone care
> to explain?

I guess an important question is what do you expect it to look like
when using negative values ?  I think I brought up this question a
few months ago in one of the other groups but don't recall much about
it at the moment other than the feature wasn't designed to use negative
numbers so you are lucky you get any results at all - good or bad.

-- 
Ken Tyler

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"Ken" <tyl### [at] pacbellnet> wrote in message
news:3A8778A0.568BE384@pacbell.net...
>
>
> AC wrote:
> >
> > I tried negative numbers on ior and got some strange results... Anyone
care
> > to explain?
>
> I guess an important question is what do you expect it to look like
> when using negative values ?  I think I brought up this question a
> few months ago in one of the other groups but don't recall much about
> it at the moment other than the feature wasn't designed to use negative
> numbers so you are lucky you get any results at all - good or bad.
>
It was just a test to see if it took negative numbers , I did not really
know what to expect.

Ambis

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