POV-Ray : Newsgroups : povray.advanced-users : HDR and brightness : Re: HDR and brightness Server Time
23 Jun 2024 14:26:58 EDT (-0400)
  Re: HDR and brightness  
From: Alain
Date: 24 Feb 2018 12:05:46
Message: <5a919b6a$1@news.povray.org>
Le 18-02-24 à 06:09, Mike Horvath a écrit :
> On 2/23/2018 9:50 PM, Alain wrote:
>> Le 18-02-23 à 13:18, Kenneth a écrit :
>>> Mike Horvath <mik### [at] gmailcom> wrote:
>>>> Can I achieve the same brightness using an HDRI sky as using a light
>>>> source? Or are there limits on how bright a scene can be?
>>> I haven't yet used an HDRI image/image_map in a scene, but I would 
>>> assume that
>>> the maximum rendered brightness on-screen would be clipped to 1.0 
>>> (typical
>>> maximum white)-- or rather, as bright as your monitor can reproduce 
>>> 1.0, just
>>> like with any scene.
>>> The saved file is another matter, if it's saved as HDRI. (POV-Ray can 
>>> do that,
>>> right? I haven't read the documentation enough to know.)
>> Yes, you can save as high dyamic range image. Just need to add +fe 
>> (*.exr) or +fh (*.hdr) to the command line. Then, there is no clipping.
> I wonder if it would be easier to render my sky and fluffy clouds once, 
> and then include it in subsequent renders as HDRI.
> Mike

It can be done, but be aware that the clouds won't cast any shadow at all.
Depending on the specific of the rendered scene, this may be a problem.

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