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February 09, 2012

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Maya: alpha channel question




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srge Posted: June 15, 2006   Post subject: Maya: alpha channel question
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Hm... Okay I have a TGA. It's basically some white labels for buttons. It has an alpha channel, but unlike my other buttons that had a black texture... these ones with a white texture don't show up.
From the image File I added File.outAlpha > Projection.Image.R/G/B and that made it show up. BUT now it only shows up as black. =P
The big question in my mind, is that this works with other buttons where the button decal is black, but when the button decal is white it frick'n pukes.
So I'm assuming that it's just using the Alpha channel at this point for the color

PolyGru Posted: June 16, 2006   Post subject:
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Maybe its related to the transparency
But actually you have to see something
I think that you are plugin the alpha into the colors
Does the projection have no alphaSlot?


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srge Posted: June 16, 2006   Post subject:
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Not really, it just hooks up File.outColor > Projection.Image by default

PolyGru Posted: June 16, 2006   Post subject:
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But i would think there is an outAlpha also
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srge Posted: June 16, 2006   Post subject:
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File.outAlpha doesn't have any logical place to hookup that I saw

PolyGru Posted: June 16, 2006   Post subject:
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I mostly only use projectionMapping for gradients
I see an alphaGain here in the projectionNode
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srge Posted: June 16, 2006   Post subject:
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AlphaGain? lemmie hook up that one and I'll tell you what spits out

PolyGru Posted: June 17, 2006   Post subject:
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And i see an outAlpha from that projectionNode
Thats what you have to use
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srge Posted: June 17, 2006   Post subject:
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Just to clarify, in the alpha channel what's WHITE is visible, and BLACK is masked...

PolyGru Posted: June 17, 2006   Post subject:
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In the alphaChannel that is
For transparency, its what white is transparent, and black is opaque
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srge Posted: June 17, 2006   Post subject:
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Ah, I had it right the first time
Okay, I hooked File.outAlpha > Projection.Alpha Gain... lets render and see =]

PolyGru Posted: June 17, 2006   Post subject:
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And you have to hook up outAlpha aswell
I mean to the transparency
Of the actual shader
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srge Posted: June 17, 2006   Post subject:
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okay now it seems to say "fuck you" and ignores the projection. =P
And tiles across the geometry

PolyGru Posted: June 17, 2006   Post subject:
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Does it tile around the area or within ?
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srge Posted: June 17, 2006   Post subject:
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Within
Each button
Instead of within the projection
I've deleted the 2DProjection node and I'm going to try that =]

PolyGru Posted: June 17, 2006   Post subject:
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Hmm thats unexpected
It doesnt ignore the projection, it would have to use uv then
So you see the complete texture within every button ?
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srge Posted: June 17, 2006   Post subject:
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Not the whole thing

PolyGru Posted: June 17, 2006   Post subject:
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First of all if you don't need tiling, turn it off
WrapU wrapV
Then everything else get the default color so make it black
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