[Bf-funboard] Using ONLY an Image's Alpha Channel
alex
alex at schnittenparadies.de
Sun Jan 15 18:30:28 CET 2006
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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