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 15:05:33 EDT (-0400)

From: Mike Horvath
Date: 22 Nov 2016 19:59:20
Message: <5834e9e8$1@news.povray.org>

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

Post a reply to this message