[Bf-funboard] Using ONLY an Image's Alpha Channel

[Chris Burt]

Yeah it definitely sounds like you're looking for the stencil feature...

Regards,
--Chris

alex wrote:
> On Sun, 15 Jan 2006, Douglas Bischoff wrote:
> 
>> Hello, all!
>>
>> Looking for a shortcut to a two-step process.
>>
>> I'm familiar with how to use an image's alpha channel to make the 
>> background color show through: this request has nothing to do with 
>> modifying IMAGE alpha.
>>
>> What I'm trying to do is use the Alpha channel of an RGBA image to 
>> affect the Alpha value of the texture (ZAlpha or RayAlpha, doesn't 
>> matter).
>>
>> Right now it seems the only way to do this is to save the Alpha 
>> channel of the image as its own 8-bit grayscale file and apply THAT as 
>> a second Texture channel. A faster way would be for the Image pane of 
>> the Texture panel to have a new button called "OnlyAlpha" that ignores 
>> the RGB channels of the image and loads the image's Alpha Channel ONLY.
>>
>> This would allow you to use the image to modify "Col" in one texture 
>> channel, then load the same image file and select "Only Alpha" and use 
>> THAT to modify "Alpha" so that the Col completely "cookie cutter's" 
>> out the faces its applied to.
> 
> 
> Urm, what about just turning off "Col" for the alpha-only channel? :D
> 
> alex at schnittenparadies.de
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