Info-Volumizer Mailing List Archives: Re: Performer Node [again]

Re: Performer Node [again]

From: Don Burns (don_burns@peru)
Date: 05/12/2000 15:49:51

> ok. let's say, for example, that i need to modify the color LUT dynamcally
> from the computational process. is there a straightforward approach to
> get the LUT parameters into the Performer node, so that this can be applied
> to the OGLVolumizer?

So, for whatever reason, we subclassed pfVolume as a pfGroup. I would have
preferred it to be a pfGeode, but for some compelling reason, which I don't
remember, we subclassed it as a pfGroup. You'll need to add the following
method to the pfVolume class in pfVolume.h:

        pfGeode *getGeode( void ) { return geode; }

You'll then need to create a pfColortable and add it to each of the geosets in
the geode:

    pfColortable *ctable = new pfColortable;

    pfGeode *geode = vol->getGeode();
    for( int i = 0; i < geode->getNumGSets(); i++ )
    {
        pfGeoSet *gset = geode->getGSet( i );
        pfGeoState *gstate = gset->getGState();
        gstate->setMode( PFSTATE_ENCOLORTABLE, PF_ON );
        gstate->setAttr( PFSTATE_COLORTABLE, ctable );
    }

You may then manipulate the pfColortable in any process you wish.

 is there a straightforward way to get any number of
> variable data parameters from the computational process to OGLVolumizer in
> the Performer node?

Do you actually mean COMPUTE? or APP? Either way, recall that pfVolume.C is
provided as sample source code for implementing a volume in Performer. You'll
need to alter the source code to get what you want. I assume you want to make
calls like:

    voAppearanceActions::getBestParameters( ... )

etc. These could be exposed in the pfVolume class API, somehow I suppose.
 Dave, any thoughts on implementing this?

-don

Caveats. Remember that the Volumizer data is initialized and manipulated in
the APP process, which does not have a graphics context. The results of

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