SharkD nous apporta ses lumieres en ce 2007/06/16 17:44:
> "SharkD" <nomail@nomail> wrote:
>> I've tried specifying iors that are less than one but get very different
>> results. The cones are now striped. It doesn't look very good at all.
> 
> Nevermind. I had set the ior to -1.01 instead of 0.99.
> 
> I've tried nesting cones with increasing ior as follows. However there are a
> lot of shadow-like artifacts introduced which I don't know how to get rid
> of.
> 
> #declare Increment1 = 0.1;
> #declare Increment2 = 0.01;
> #declare Exhaust_Plume = union
> {
>  #declare Count1 = 0;
>  #while (Count1 < 1)
>   #declare InvCount1 = 1 - Count1;
>   #declare Count2 = 0;
>   #while (Count2 < 1)
>    intersection
>    {
>     cone
>     {
>      <0,Count2 * -128,0,>, 6 + Count2 * Count1 * 26, <0,(Count2 +
> Increment2) * -128,0,>, 6 + (Count2 + Increment2) * Count1 * 26
>      open
>     }
> 
>     material
>     {
>      texture
>      {
>       pigment {color rgbt 1}
>      }
>      interior
>      {
>       ior ((1 - InvCount1 * 0.1) + Count2 * InvCount1 * 0.1)
>      }
>     }
>    }
>    #declare Count2 = Count2 + Increment2;
>   #end
>   #declare Count1 = Count1 + Increment1;
>  #end
> }
> 
> 
Take a look at how many cones you have. The first loop is executed 10 times, the 
secont 100 times = 1000 cones. This result in rays having to cross 2000 
surfaces! You then need a max_trace_level of AT LEAST 2001 while the maximum 
value possible is 255...
Every times you exeed max_trace_level, you get BLACK returned.

-- 
Alain
-------------------------------------------------
A short cut is the longest distance between two points.

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