Re: Re: [info-performer] pfVolume and lookup table

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From: Praveen Bhaniramka (praveenb++at++mrcoffee.engr.sgi.com)
Date: 06/10/2003 02:03:37

Hi Simone,

Did you define the parameter "lookup_table" appropriately for the shape's
appearance? You will still need to do the LUT initialization and other
stuff that you had mentioned in your code snippet! Do you get any errors
printed on the console?

- Praveen

On Tue, 10 Jun 2003, Simone Herrmann wrote:

> Hi Praveen,
>
> I tried this and now my volume volume is not visible any more.
> What happened?
>
> Praveen Bhaniramka <praveenb++at++mrcoffee.engr.sgi.com> schrieb am 09.06.03 18:44:52:
> >
> > Hi Simone,
> >
> > The various parameters attached to the shape's appearance are used by the
> > shader, which uses them to do the actual shading (in your case applying a
> > lookup table). So, adding new parameters will only have any effect if the
> > corresponding shader _uses_ these parameters.
> >
> > In short, update the shader for the shape's appearance to use the
> > TMLUTShader, which would then apply the lookup table.
> >
> > vzTMLUTShader *newShader = new vzTMLUTShader();
> > vol->getShape()->getAppearance()->setShader(newShader);
> >
> > Cheers,
> > Praveen
> >
> > On Mon, 9 Jun 2003, Simone Herrmann wrote:
> >
> > > Hi,
> > >
> > > How can I apply a lookup table to a volume in the pfVolume node?
> > >
> > > I tried:
> > >
> > > vzParameterLookupTable* myTable = myLoadLookupTable();
> > >
> > > pfVolume* vol = new pfVolume;
> > > vol->readFile("myVolume.vz");
> > > vol->getShape()->getAppearance()->setParameter("lookup_table", myTable);
> > >
> > > but the image still remains uncoloured.
> > >
> > > Thanks,
> > > Simone
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> > --
> > -----------------------------------------------------------------
> > Praveen Bhaniramka Member of Technical Staff (MTS)
> > praveenb++at++sgi.com Advanced Graphics Division
> > (650)933-1785 Silicon Graphics, Inc.
> > -----------------------------------------------------------------
>
>
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-- 
-----------------------------------------------------------------
Praveen Bhaniramka               Member of Technical Staff (MTS)
praveenb++at++sgi.com                 Advanced Graphics Division
(650)933-1785                    Silicon Graphics, Inc.
-----------------------------------------------------------------

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