On 11/22/2016 2:30 AM, clipka wrote:
> Am 22.11.2016 um 01:46 schrieb Mike Horvath:
>
>> I am trying random things now.
>>
>> isosurface
>> {
>>     function {max(convertLCH2RGB_R(x,y,z), 1)}
>
> throw away the max() function, and take care of the polar-ish coordinate
> system by replacing:
>
>     convertLCH2RGB_R(x,y,z)
>
> with:
>
>     convertLCH2RGB_R(y*200-100,sqrt(x*x+z*z)*100,atan2(x/z)*pi/180)
>
> (presuming you want L up and I got the math right)
>
>>     contained_by
>>     {
>>         box {-2,+2}
>>     }
>> //    threshold FLOAT_VALUE
>
> ... and use threshold 1. That should give you something visible.
>
>>     accuracy    0.01
>>     max_gradient    5
>> //    [evaluate P0, P1, P2]
>> //    open
>> //    [max_trace INTEGER] | [all_intersections]
>>     pigment {rgb 1}
>> }
>>
>> This takes a long time to render, but there's nothing visible happening.
>>
>> Mike
>

THANK YOU!!

However atan2 requires two parameters and your math only has one.

Mike

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