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I'm not entirely sure if this is a change as I have not really used the flag before the XSI 4.2 era. I inquired on the mental ray mailing list as to the nature of the intentions for the flag and got no response. My theory is that its meant for a completely homogeneous file I/O environment with respect to gamma, where all incoming textures and and outgoing displays are the same gamma... such as say... for pure video processing. It seems to be a particularly contrived usage scenario however.
-brad
Luc-Eric Rousseau <lucer(at)Softimage.COM> wrote: has this behaviour changed.. in previous
versions I don't remember the gamma setting affecting the textures -----Original Message-----
From: owner-xsi(at)Softimage.COM [mailto:owner-xsi(at)Softimage.COM]On Behalf Of brad friedman
Posted At: Thursday, June 08, 2006 2:57 PM
Posted To: xsi
Conversation: Re: Framebuffer and Gamma
Subject: Re: Re: Framebuffer and Gamma
technically speaking, its not really broken... in that it does exacty what mental ray's manuals say it will. It de-gamma's all image file reads and gamma's all image file writes that it can. The problem is, thats not what you want to do in order to work linear in most cases. Maya has exactly the same problem when using mental ray.
Silly us for thinking a flag marked "gamma" would do a simple gamma correction to the outgoing frame buffer :)
-brad
Gent Krasniqi <gentkr(at)gmail.com> wrote: Ah! That would be convenient. I've never actually used the built-in
feature in previous versions, and don't know how well it worked when
it did work. (if it ever did :P)
Hope it gets fixed soon.
On 6/8/06, Harry Bardak wrote:
> Because I was a bit naive :)
>
> Also because , if you set mental ray's gamma it will automatically de-gamma incoming textures (with the exception of "float" textures, which is assumed to be in linear space already).
>
>
> Harry Bardak
> TD / Compositor.
>
>
Http://perso.wanadoo.fr/harry.bardak/
> +33 6 76 63 35 54
> +44 781 661 4147
>
> ----------------------------------------
> > Date: Thu, 8 Jun 2006 11:23:19 +0200
> > From: gentkr(at)gmail.com
> > To: XSI(at)Softimage.COM
> > Subject: Re: Framebuffer and Gamma
> >
> > Why don't you do this with a dummy lens shader, and a color correction
> > node? That's the way I've been doing it with great results. Although
> > I have to have a color correction node for all the textures in
> > materials too (0.455).
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