Re: cliptextures with alpha?

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Angus Dorbie (dorbie++at++sgi.com)
Tue, 16 Jun 1998 09:39:14 -0700

Stephen Maher wrote:
>
> Hi,
>
> Is alpha supported with clip textures?
>
> I created a clip texture with alpha and I'm not seeing good results in
> perfly 2.2 (i.e., no alpha). I'm using mgmosaic to generate the clip
> texture (sgi8888, or raw8 format) and specifying alpha=0 for the
> region mgmosaic pads to create a square texture.
>
> I haven't verified the alpha values in the raw8 files, but I have
> verified mgmosaic generates correct alpha in rgba ("RGBA" in mgmosaic)
> files. (That format isn't read by pf 2.2).
>
> Do I have to pfEnable(blending ..) somewhere?
>

Yes, or use pfAlphaFunc to cull fragments but you also have to
specify the right formats in the .ct file or you'll convert to
just rgb on the way to texture memory.

Cheers,Angus.

-- 
"Only the mediocre are always at their best." -- Jean Giraudoux 


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