POV-Ray : Newsgroups : povray.binaries.images : billboard tint : Re: billboard tint Server Time
28 Nov 2023 06:01:10 EST (-0500)
  Re: billboard tint  
From: Thomas de Groot
Date: 5 Nov 2023 02:07:27
Message: <65473f2f$1@news.povray.org>
Op 04/11/2023 om 16:10 schreef Mike Miller:
> Thomas de Groot <tho### [at] degrootorg> wrote:
>> Op 3-11-2023 om 17:49 schreef Mike Miller:
>>> After taking some time off from POV, I'm ready to tackle a few new scenes I have
>>> in mind. One involves a landscape with some foreground vegetation. I started
>>> collecting some 2D sprite images of moss, grasses, and weeds thinking that I
>>> could populate the ground with them. I've run into a problem with the
>>> transparent portion of the png when turning on fog. The fog is tinting the
>>> billboard shape. I've removed the finish and have tried a variety of things in
>>> the shader with no success. I can fall back on 3D models if I can't get the
>>> sprites to work.  Below is what I used to texture this example. I understand
>>> that the bump statement will not have much of an effect without a finish. Any
>>> help would be appreciated.
>>> Thanks,
>>> Mike.
>>>
>>
>> No /help/ from this side, just the (historical) mention that this
>> particular fog problem has been around since... prehistory. I first hit
>> it, I think, sometime in the late '90's or early '20's when I tried to
>> do exactly what you want to do. At the time I was also directed to use
>> media instead of fog. Otherwise, there was no satisfying workaround.
>>
>> --
>> Thomas
> 
> Same...I do remember trying this before back in the day. I guess I always use a
> touch of fog in my scenes. It looks like turbulence 0 in the fog statement
> works.
> Mike.
> 
Yes, that seems a nice workaround indeed. Very strange. I do not 
recollect that it was mentioned at the time; probably not...

Note to self: add a note to Notes... ;-)

-- 
Thomas


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