Lighting in draw callback

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Bryan Walsh (bryanw++at++earthlink.net)
Fri, 15 Jan 1999 06:28:03 -0700

Hello pfFellows,

Because I need to draw some geometry in native OpenGL, and as a work around
to some sorting issues, I have several pfGroup draw callbacks. The geometry
drawn include pfdCones, pfdSpheres, as well as my native OpenGL geometry.
Everything works fine except the specular component of the material. i.e., I
don't see the highlighting/reflection from the material. Below is a sample
of what I'm trying to do. Any helpful suggestions would be greatly
appreciated.

typedef struct {
   int color;
   int visible;
   pfGeoSet *cone;
   pfMaterial *material;
   pfLightModel *lightmodel;
   pfLight *light[PF_MAX_LIGHTS];
   pfGeoState *state;
   int first;
} ConeData;

int drawCone(pfTraverser *, void *data) {
   ConeData *pd = (ConeData*)data;
   if (pd->first) {
//
// pd->cone = pfdNewCone called externally
// pfdNewCone includes normals
//
      pd->first = 0;
      float fcolor[4];
      fcolor[0] = (float)(pd->color & 0xff) / 0xff;
      fcolor[1] = (float)((pd->color >> 8) & 0xff) / 0xff;
      fcolor[2] = (float)((pd->color >> 16) & 0xff) / 0xff;
      fcolor[3] = 0.2;
      pd->material = new pfMaterial();
      pd->material->setAlpha(0.15f);
      pd->material->setShininess(40.0f);
      pd->material->setColor(PFMTL_DIFFUSE, fcolor[0],fcolor[1],fcolor[2]);
      pd->lightmodel = new pfLightModel();

      pd->light[0] = new pfLight();

      pfPushIdentMatrix();
      pd->light[0]->setPos(0.0f, 1.0f, 0.0f, 0.0f);
      pfPopMatrix();

      pd->lightmodel->setAmbient(0.8f, 0.8f, 0.8f);
      pd->lightmodel->setLocal(PF_OFF);
      pd->lightmodel->setTwoSide(PF_ON);
      pd->state = new pfGeoState();
      pd->state->setMode(PFSTATE_TRANSPARENCY, PFTR_HIGH_QUALITY);
      pd->state->setAttr(PFSTATE_FRONTMTL, pd->material);
      pd->state->setAttr(PFSTATE_BACKMTL, pd->material);
      pd->cone->setGState(pd->state);
   }

   pfPushState();
   pfPushMatrix();
   pfBasicState();

   pd->lightmodel->apply();
   pd->light[0]->on();

   glEnable(GL_BLEND);
   glBlendFunc(GL_SRC_ALPHA,GL_ONE_MINUS_SRC_ALPHA);
   glDepthMask(GL_FALSE);
   pd->cone->draw();
   glDepthMask(GL_TRUE);

   pfPopMatrix();
   pfPopState();

   return PFTRAV_CONT;
}

Help would be greatly appreciated,

Thanks

Bryan Walsh

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