Re: SIZE OVERRIDE graded alpha 4

New Message Reply Date view Thread view Subject view Author view

Angus Dorbie (dorbie++at++sgi.com)
Mon, 01 Jun 1998 11:54:51 -0700

Simon M Hart wrote:
>
> Hilko (or any one else)
>
> I'm still struggling here, despite alot of help from the performer
> group.
>
> One problem is that I do not have a graded alpha channel rgba to
> compare my results with.
>
> Attached are three images:
> 1: a gradient in rgb (256x256 pixels)
> 2. a head in rgb (256x256 pixels)
> 3. a screen snap of my efforts, using Gimp and Medit.
>
> If you can spare the time, could you use your tools to
>
> 1:combine the gradient with the head image
> 2.take a screen snap of the graded alpha channel texture in use in
> realtime 3d
> 3.email back to me the screen snap and the .rgba

Please don't send large binaries to this mailing list. There
are about 1000 subscribers and some of then don't need 200K
of attachments.

Now back to the subject, why do you need someone to combine the
images for you? It looks like ou have already combined them.

The problem may be with the way Medit is drawing the
polygon to the framebuffer, but I can't tell without
the rgba.

The glAlphaFunc is turned on but there is no GL_BLEND which uses
source alpha enabled hence the lack of blending.

I'll bet if you specify a material with alpha (do this as a test
but it's not a solution) medit will do the right thing. In
anycase test this in the Medit loader also. It may be that Medit
doesn't enable pfTransparency in the geostate either.

Incase the problem is with the image I'll following up with a
combined rgba created in the MultiGen texture editing tool.

Cheers,Angus.

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


For advanced 3D graphics Performer + OpenGL based examples and tutors:
http://www.dorbie.com/
=======================================================================
List Archives, FAQ, FTP:  http://www.sgi.com/Technology/Performer/
            Submissions:  info-performer++at++sgi.com
        Admin. requests:  info-performer-request++at++sgi.com

New Message Reply Date view Thread view Subject view Author view

This archive was generated by hypermail 2.0b2 on Mon Aug 10 1998 - 17:57:29 PDT

This message has been cleansed for anti-spam protection. Replace '++at++' in any mail addresses with the '@' symbol.