POV-Ray: Newsgroups: povray.text.scene-files: L*C*h(uv) functions: Re: L*C*h(uv) functions

POV-Ray : Newsgroups : povray.text.scene-files : LCh(uv) functions : Re: LCh(uv) functions		Server Time 29 Apr 2024 15:34:18 EDT (-0400)

From: Mike Horvath
Date: 22 Nov 2016 20:11:33
Message: <5834ecc5@news.povray.org>

On 11/22/2016 7:59 PM, Mike Horvath wrote:
> On 11/22/2016 4:44 AM, clipka wrote:
>> Am 22.11.2016 um 09:43 schrieb Mike Horvath:
>>> On 11/22/2016 3:31 AM, clipka wrote:
>>>>     min(
>>>>       convertLCH2RGB_R(y*200-100,sqrt(x*x+z*z)*100,atan2(x,z)*pi/180),
>>>>       convertLCH2RGB_G(y*200-100,sqrt(x*x+z*z)*100,atan2(x,z)*pi/180),
>>>>       convertLCH2RGB_B(y*200-100,sqrt(x*x+z*z)*100,atan2(x,z)*pi/180),
>>>>
>>>> 1-convertLCH2RGB_R(y*200-100,sqrt(x*x+z*z)*100,atan2(x,z)*pi/180),
>>>>
>>>> 1-convertLCH2RGB_G(y*200-100,sqrt(x*x+z*z)*100,atan2(x,z)*pi/180),
>>>>       1-convertLCH2RGB_B(y*200-100,sqrt(x*x+z*z)*100,atan2(x,z)*pi/180)
>>>>     )
>>>
>>> I think the last parameter should be atan2(x,z)*180/pi because atan2
>>> returns radians and convertLCH2RGB_R expects degrees.
>>
>> I guess you're right about this one.
>>
>
> I am also not sure if using atan2 is good, since that only covers 90
> degrees, whereas the hue circle must use all 360 degrees.
>
> Mike

Sorry. Disregard that. It works.

Mike

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