Re: mR_sky&mR_sun?

["Tim Leydecker" <BauerOink(at)gmx.de>]

Hi Halfdan,

I also like the idea (as Harry pointed out) to work with
files made linear and have an "on the fly but non-persistent"
LUT assigned ontop the Renderwindow and Region,
the advantage over a LensShader/outputShader is
the non-destructive workflow and (maybe) the option
to cycle through multiple gamma and tonemapping
settings without having to re-render. Francesca Luce
has something like this in the making for Maya/mR.

Something (halfway) similar is in Adobe AE Professional 7.01
where one can up/down exposures without re-rendering
a preview and can also display things using a filmstock preset.
(unfortunately, setting up this "proof" is a bit convoluted and
has great potential for screwing things up completely by
setting the wrong input/blackspot and so on).

I guess the real problem is to get to a standard that can be
kept throughout an entire pipeline of apps/factories/people.

I don´t envy you for having to get to that point without
a proper response or satisfiable explanation of opinions
but I do honor your efforts.

Cheers


tim



----- Original Message ----- 
From: "Halfdan Ingvarsson" <hingvars(at)Softimage.COM>
To: <XSI(at)Softimage.COM>
Sent: Friday, January 05, 2007 5:31 PM
Subject: RE: mR_sky&mR_sun?


I am fully aware that it is "incorrect", although it all depends on the context. 
mental images like bandying this word around without ever spelling out why. A bit 
like that guy in The Princess Bride with the word "inconceivable". They're a just 
like that.

The transfer function should ultimately be controlled by the user. This is the point 
I've been trying to make in the threads regarding the, now missing, gamma control. If 
I'd just slapped an arbitrary, non-linear transfer function in there, then it 
would've been even more "incorrect" >from the point-of-view of the user.

- ½

________________________________

From: owner-xsi(at)Softimage.COM on behalf of Tim Leydecker
Sent: Fri 05-Jan-07 07:10
To: XSI(at)Softimage.COM
Subject: Re: mR_sky&mR_sun?



Thanks again, Harry.

Great read. Funny thing is the info on page 9, compared to
Haldan´s info on the XSI default mapping of 32to8bit renderview:

----------------------------------------------------------------
The problem is that physically correct computer graphics operate in a true linear
color space

where a value represents actual light energy. If one simply maps the range of colors
output to

the renderer naively to the 0-255 range of each RGB color component it is incorrect.

--------------------------------------------------------------------------------------------------

Also like the info about many people rendering to gamma 1.8,

I noted that even the Unreal Engine does this on the PC (I tried to
hack god mode into Rainbow Six Vegas yesterday, being feed up
with the Dante level - I failed, made the level anyway am now stuck
with Hoover - those Ubisoft guys shouldn´t have spared their saves).

...Just in case you where in for some completely unrelated info...

But seriously, Thanks again for the link, I´m back at work.

Cheers

tim


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