a constant shader has an alpha input at colour level, lambert doesn't.
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| Raffaele Fragapane |
| Rising Sun Pictures |
| "Remember, TD is for TopDog" |
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Benjamin Huber wrote:
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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