Re: Framebuffer - Unexpected Failure

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

Hi Harry,

thanks for the great tutorial article and files provided!
It´s really helpful, will have a look at the lense shader
and compare it with the simple tonemap lenshader
that comes with XSI6.0 as well, right after getting
over those damn displayglitches I get in shaded mode
(all objects "disappearing" into the same "viewportgray").
May be another (unrelated) bugger with my nvidia cards...

But I´ve logged a bug in the meantime,

UDEV00235513

XSI 6.0 Framebuffers - Unexpected Failure

Thanks again for supplying great info, guys!

Cheers

tim


----- Original Message ----- 
From: "Harry Bardak" <hb_xsimailinglist(at)hotmail.com>
To: <xsi(at)Softimage.COM>
Sent: Wednesday, January 03, 2007 12:17 PM
Subject: RE: Framebuffer - Unexpected Failure


> That's true gamma option will ungamma all textures except float images. Because 
> float images are considered linear defacto ( which make sense to me )
> But there is another problem when using gamma option. You can't use mitchell and 
> lanczos filter it generate some artifact when you render because of negative colors 
> involved by using these two filter ( Bug logged by the way )
>
> I wrote a very simple tonemapper here :
> http://perso.orange.fr/harry.bardak/sRGB.htm
>
> It include a leans shader that linear color space to sRGB color space and a texture 
> node that convert sRGB to lin.
> You should use the texture node on color map and NOT on data map such as 
> displacement, bump or normal map.
>
> Have fun.
>
>
> Harry Bardak
> TD / Compositor.
>
> Http://perso.wanadoo.fr/harry.bardak/
> +33 6 76 63 35 54
> +44 781 661 4147
>
> ________________________________
> > Subject: RE: Framebuffer - Unexpected Failure
> > Date: Tue, 2 Jan 2007 19:47:37 -0500
> > From: hingvars(at)Softimage.COM
> > To: XSI(at)Softimage.COM
> >
> > If there are two framebuffers using the same filename, the second one is ignored. 
> > It shouldn't fail like that unless all the other framebuffers are disabled. Do all 
> > the framebuffers have checkmarks in front of them? Please make sure you attach the 
> > scene to the bug report, if this is already the case.
> > The HDR format has always been 8-bit RGBE. 8-bit Red, green, blue + 8-bit 
> > exponent. It's just what it is.
> > The global gamma control has been removed since it is confusing and doesn't work 
> > the way people expect (it applies inverse gamma on input textures but *only* if 
> > they're non-float). We're working on a more comprehensive gamma/tonemapping system 
> > for a future release. In the interim I wanted to wean people off of that broken 
> > gamma control.
> > As for the preview, for float output, it simply maps the 0-1 RGB channel values of 
> > the framebuffer to 0-255 8-bit values and clips above and below. There is no 
> > additional mapping done.
> >  - ½
> > ________________________________
> > From: owner-xsi(at)Softimage.COM on behalf of Tim Leydecker
> > Sent: Tue 02-Jan-07 19:28
> > To: XSI(at)Softimage.COM
> > Subject: Framebuffer - Unexpected Failure
> > Hi guys, using XSI 6.0 I get the following errormessage
> > after adding several "Main" framebuffers in various
> > outputformats and bitdepths (*.exr, *.hdr, *.ct,..)
> > for a test, anyone else run into this allready?
> > ' ERROR : Frame buffers 'Main' and 'Main' both use the same file name
> > 'disk\Render_Pictures\beauty.030.pic'
> > ' ERROR : Cannot render frame buffer 'Main'
> > ' ERROR : No valid framebuffers found to render. Render aborted.
> > ' ERROR : 21000-REND-RenderPass - Unspecified failure
> > Can´t get the pass to render afterwards, even thought I deleted
> > all double "Main" framebuffers.
> > Oh, btw, why is the *.hdr format 8 bit RGBE only?
> > This stuff "feels" a bit buggy, I´ll submit the file to support tomorrow...
> > Cheers
> > tim
> > P.S: And where´s the global gamma slider gone to?
> > P.P.S: And how am I supposed to find the values for a 32bit
> > tonemapping that would match the 8bit Renderwindow preview?
> > ---
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