[info-performer] Transparency.

From: Carlos Delgado (C.Delgado++at++pgr.salford.ac.uk)
Date: 09/22/2003 05:47:04

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Hi there,

I am having problems with transparency. The sphere I create is
completely opaque.
I have tried setting the different types of transparency to no avail.
Please find attached the class I develop to create the (expected)
translucent spheres.

I am working with IRIS Performer 2.2.10 on a 02

Thanks,
Carlos

// Start of code

const float clveGeoParticleSet_impl::_DEF_RADIUS = 1.0f;
const float clveGeoParticleSet_impl::_MAX_RADIUS_ALPHA = 10.5f; //35sec
(expectancy) x 0.3 (m/s)
clveGeoParticleSet_impl::clveGeoParticleSet_impl () {

  _pDCS = new pfDCS();

  _pSphere = _createSphere (_DEF_RADIUS);
  _pDCS->addChild ( _pSphere);

 // For transparency!
  _pGState = new pfGeoState ();
  //_pGState->setMode (PFSTATE_TRANSPARENCY, PFTR_ON);
  _pGState->setMode (PFSTATE_TRANSPARENCY, PFTR_BLEND_ALPHA);
  //_pGState->setMode (PFSTATE_TRANSPARENCY, PFTR_FAST);
  _pMaterial = new pfMaterial ();

  // Link them to sphere!!!
  _pGSet->setGState (_pGState);
  _pGState->setAttr (PFSTATE_FRONTMTL, _pMaterial);

  // Set collision Mask so that is doesn't collide!

}

pfGeode * clveGeoParticleSet_impl::_createSphere(float radius)
{

 //pfVec4 *colorAttr;
 pfMatrix matrix;
 pfGeode *geode = new pfGeode;
 _pGSet = pfdNewSphere(32,pfGetSharedArena());
 //colorAttr = (pfVec4 *) pfMalloc(sizeof(pfVec4),pfGetSharedArena());
 //*colorAttr = color;
 //gset->setAttr(PFGS_COLOR4,PFGS_OVERALL,colorAttr,NULL);
 matrix.makeScale(radius,radius,radius);
 pfdXformGSet(_pGSet,matrix);
 geode->addGSet(_pGSet);
 return geode;
}

int clveGeoParticleSet_impl::show (){

  //add _pDCS to scene
  clveWorld::getSingleton()->addToScene (_pDCS);
  return VE_OK;
}

int clveGeoParticleSet_impl::hide (){
  //remove _pDCS from scene
   clveWorld::getSingleton()->removeFromScene (_pDCS);

  return VE_OK;

}

int clveGeoParticleSet_impl::update (float fRadius, const stveVector
&pos) {

   _pDCS->setTrans (pos.x, pos.y, pos.z);

   // Here Convert from Units in Formula to Units in VE

   _pDCS->setScale (fRadius);

   float fAlpha = 0.3;

   //depending on Radius and intensity (strength ?)
   //fAlpha = (clveGeoParticleSet_impl::_MAX_RADIUS_ALPHA - fRadius) *
_fIntensity / clveGeoParticleSet_impl::_MAX_RADIUS_ALPHA;
   _pMaterial->setAlpha( fAlpha );
   return VE_OK;

}

int clveGeoParticleSet_impl::initialise (int iType, float fIntensity) {
     _pDCS->setScale (1.0f);
     _fIntensity = fIntensity;

     //(depending on type) colour

     _pMaterial->setColorMode( PFMTL_BOTH, PFMTL_CMODE_COLOR );
     _pMaterial->setColor( PFMTL_AMBIENT, 0.3f, 0.3f, 0.3f );
     _pMaterial->setColor( PFMTL_DIFFUSE, 1.0f, 0.9f, 0.7f );
     _pMaterial->setAlpha( 0.5f );
   return VE_OK;
}

-- 
Carlos Delgado                                 ~~~~~
Centre for Virtual Environments               (\o o/)
The University of Salford           ___________ &!& _______________
Business House M5 4WT, U.K.       &"Inspiration exists, but it has &
(44) +161 295 2918                & to find us working" --Picasso  &
Fax (44) + 161 285 2925            ________________________________
web http://www.nicve.salford.ac.uk/carlos

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