[Sidefx-houdini-list] H13 Linear lighting/rendering

jason slabber jason.slabber at gmail.com
Fri Nov 22 02:57:57 EST 2013


Hey Peter

Have you brought this up with SESI?
Just wondering cause we would also like to have our own control
over texture colorspace. Not just auto and linear, seems a bit limiting...

J


On Thu, Nov 21, 2013 at 7:32 PM, Peter Bowmar <pbowmar at gmail.com> wrote:

> Hi Craig,
>
> Basically Houdini assumes non-8 bit file formats are encoded sRGB so
> it linearizes them (gamma .4545) on ingestion via (for example) the
> vex texture() call. It assumes 16/32 bit are linear (gamma 1 as you
> say) and uses them straight up.
>
> I think it's very useful for the home user or smaller studio but we
> apply LUTs to everything and control via pipeline what textures are
> encoded as (displacement for example might be 8 bit but linear, though
> that's unusual) so SESI have added some env vars to turn it all off if
> you want to manage it yourself.
>
> However, in a nutshell, yes, leave your viewer at gamma 2.2 since
> renders will be "linear" i.e. gamma 1.0 internally.
>
> Cheers,
>
> Peter B
>
> On 21 November 2013 09:05, Craig Hoffman <craigleehoffman at aol.com> wrote:
> >
> > I read this in the H13 docs:
> >
> > Linear color workflow
> >
> >
> > Houdini is now set up to work in a linear color space/gamma of 2.2 by
> default.
> >
> > VEX texture functions that work on 8-bit images will now convert the
> images from sRGB colorspace to linear. You can override this with a
> variadic argument.
> >
> >
> > I am a little confused- isn't linear gamma '1.0'?...   Or is this saying
> that it is converting everything to 1.0 internally for calculations and
> then back to work properly with 2.2 screen gamma in GL Viewport and Render
> View?
> >
> > So should I leave my Render View at 2.2?  It seemed to look better at
> 1.0 for my PBR renders...
> >
> > Thanks,
> > Craig
> >
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>
>
> --
> Cheers,
>
> Peter B
>
> --No, I am not on Facebook.
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