POV-Ray : Newsgroups : povray.documentation.inbuilt : looks_like suggestion : Re: looks_like suggestion Server Time
17 May 2022 20:30:03 EDT (-0400)
  Re: looks_like suggestion  
From: Mike Horvath
Date: 12 Sep 2016 10:43:37
Message: <57d6bf19$1@news.povray.org>
On 9/12/2016 7:56 AM, clipka wrote:
> Am 12.09.2016 um 12:45 schrieb Jim Holsenback:
>> On 9/11/2016 1:55 PM, clipka wrote:
>>> Am 11.09.2016 um 16:23 schrieb Mike Horvath:
>>>
>>>> Looks_like works fine with parallel lights as long as you position the
>>>> light correctly to start off with instead of placing it at the origin
>>>> and then translating it at some later time.
>>>>
>>>> Unless I made a mistake.
>>>
>>> Judging from the code, I see no reason why that should make any
>>> difference.
>>>
>>
>> Pulled directly from the previous version of this section:
>>
>> "For point lights and spotlights you could also place the light source
>> and the looks_like object at the origin and translate them together
>> later. But for parallel lights this will not work."
>>
>> Did I get it wrong? Just trying to honor what was previously mentioned!
>
> I can't say for sure at the moment. All I can say is that I didn't find
> anything in the code that would explain that wording, but I might have
> overlooked something. I guess experiments may be needed.
>
> Maybe the sentence was placed there not so much due to unexpected
> effects on the looks_like object, but unexpected effects on the light
> source itself. (For instance, whether or wheter not POV-Ray translates
> the `point_at` location along with the parallel light source, either way
> the effect may be surprising to some users.)
>


I posted a test scene in p.t.s-f.


Mike


Post a reply to this message

Copyright 2003-2021 Persistence of Vision Raytracer Pty. Ltd.