RAW does the trick. thanks!
now, just curious: why does this affect the behaviour of the constant shader but not a lambert?
thx,
-b
> -----Original Message-----
> From: owner-xsi(at)Softimage.COM
> [mailto:owner-xsi(at)Softimage.COM]On Behalf
> Of Halfdan Ingvarsson
> Sent: Monday, October 31, 2005 12:37 PM
> To: XSI(at)Softimage.COM
> Subject: RE: alpha issues with EXRs used in a constant shader
>
>
> Check your color clip settings. There's three of them:
>
> RGB: The alpha is clamped to be between 1.0 and the maximum
> of the R, G, and B values.
> ALPHA: The RGB channels are clamped between 0.0 and the alpha value.
> RAW: No clipping occurs but it forces pre-multiply on.
>
> You'll find them under "Active Effects" in the render/region options.
>
> - ½
>
> > -----Original Message-----
> > From: owner-xsi(at)Softimage.COM
> > [mailto:owner-xsi(at)Softimage.COM]On Behalf
> > Of Benjamin Huber
> > Sent: Monday, 31 October, 2005 15:30
> > To: XSI(at)Softimage.COM
> > Subject: alpha issues with EXRs used in a constant shader
> >
> >
> > hi all,
> >
> > i'm using an EXR plugged into the colour channel of a
> > constant shader. the EXR has no alpha. however, doing a
> > render region and toggling between alpha and RGB shows that
> > the RGB luminance is being used as alpha.
> >
> > i have no idea why, but i don't think it should be like that.
> > other shaders don't behave like that.
> >
> > any ideas? i have a sample scene but it's kinda big (300k) -
> > if anyone wants to fiddle around with it - let me know.
> >
> > thanks!
> >
> > -ben
> >
> > ---
> > ben huber (x63291)
> > bhuber(at)ilm.com
> > ilm digimatte
> > serious like ninjas
> > ---
> >
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