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

Chris Burt desoto at exenex.com
Sun Jan 15 18:47:10 CET 2006

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


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
> _______________________________________________
> Bf-funboard mailing list
> Bf-funboard at projects.blender.org
> http://projects.blender.org/mailman/listinfo/bf-funboard

More information about the Bf-funboard mailing list