Re: [info-performer] pfShader wont cope with transparency

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From: Yair Kurzion (yair++at++polygon.engr.sgi.com)
Date: 03/13/2003 17:29:15

> On Thursday 13 March 2003 03:56 am, you wrote:
> > Hello Florian !
> >
> > You found a bug. Performer should always draw transparent geometry after
> > all opaque geometry.
> >
> > You can work around this bug in one of two ways:
> >
> > o Change the default bin sort order using pfChannel::setBinOrder
>
>
> well, actually it seemed to me as if the pfShader didnt care about bins at
> all.
> i tried to assign the bins of the GeoSets by hand, but it didnt change
> anything. still the pfShaded objects were drawn last.

You can't control what bin shaded pfGeosets go to. However, you CAN control the
order of drawing bins.

-yair

> > o Write your own pfChannel DRAW callback. In it, call pfDrawBin on bins in
> > the correct order.
>
>
> hmm, yes, this could be a way...
> guess ill give it a try.
>
>
> heavy thanx,
> floh
>
>
> > > hi pfCoders,
> > >
> > > i have used pfShader to do some multipass rendering on objects.
> > >
> > > however, when i use transparent objects in the same scene, the
> > > transparency is not correctly displayed when intersecting with the shaded
> > > object (transparent regions have sky color).
> > >
> > > so it seems to me that shader passes are generally drawn after all
> > > drawBins, because changing either drawBins of the shaded or unshaded
> > > geosets didnt take any effect.
> > >
> > > is my suspect correct? and is there a way that shaders cope with
> > > transparencies?
> > >
> > > please help,
> > > floh
> > >
> > > ------------------------------------------------------------
> > > Dipl.-Ing. Florian Berger
> > > Email: florian.berger++at++aec.at
> > > Homepage: http://www.geocities.com/harpin_floh
> > >
> > > -----------------------------------------------------------------------
> > > List Archives, Info, FAQ: http://www.sgi.com/software/performer/
> > > Open Development Project: http://oss.sgi.com/projects/performer/
> > > Submissions: info-performer++at++sgi.com
> > > Admin. requests: info-performer-request++at++sgi.com
> > > -----------------------------------------------------------------------
>
> ------------------------------------------------------------
> Dipl.-Ing. Florian Berger
> Email: florian.berger++at++aec.at
> Homepage: http://www.geocities.com/harpin_floh
> 

-- 
\_________  \_____  \__    \__  \_____        
\_________  \_____   \__   \__  \_____         Yair Kurzion
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