More Billboard problems

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Prakash Mahesh (prakash++at++DRAWCOMP.COM)
Tue, 17 Nov 1998 16:16:41 -0500

Hello performers,
In additon to my previous posting about Transparency/Billboard problems,
there seems to be pure Billboard problems too. It always works on one
axis only. Attached is a simple loader to show the problem. It loads
three objects, actually the axis-of-rotation are different for the
three, but you can see that it all works on the same axis.

Thanks in advance for any help.

PS : Also attached is a wrl loader (just load a non-existing .wrl file
that loads up the actual problematic billboards)

-- 
  Prakash Mahesh                                     
  prakash++at++drawcomp.com
  	--or--
  prakash++at++openworlds.com


/*
 *This loader creates three overlapping boxes, each slightly a different size.
 *Each box's billboard is created with a different axis of rotation, but all
 *are rotating the exact same way. 
 *
 *run with perfly and a non-existing "wrl" file:
 *   perfly -W800,800 a.wrl
 *
 *To build:
 CC -n32 -all -shared -check_registry /usr/lib/so_locations -exceptions -D_OWEXCEPTIONS_ -D_OWNOLICENSE_ -set_version sgi4.0.440 badbill2.C -o libpfwrl_ogl.so
 *
 */
#include <iostream.h>
#include <Performer/pf.h>
#include <Performer/pf/pfScene.h>


#include <malloc.h> 
#include <stdio.h>
#include <Performer/pr/pfMaterial.h>


#include <Performer/pf/pfDCS.h>
#include <Performer/pf/pfGeode.h>
#include <Performer/pf/pfBillboard.h>


pfDCS *topSceneGraph;
pfGeode *addBox(float xV, float  yV, float zV);
pfGeode *addBillboardBox(float xV, float  yV, float zV);
pfDCS *addDCS(float x, float  y, float z);




//the main loader routine
extern "C" pfNode *pfdLoadFile_wrl(char *fileName)
{
  fprintf(stderr,"\n\n--------------------DUMMY WRLLOADER-----------------\n");
  topSceneGraph = new pfDCS();


  //add group
  pfDCS *dcs2= addDCS(0.,0.,0.);
  dcs2->addChild(addBillboardBox(10.,2.,.4));
  dcs2->addChild(addBillboardBox(11.,1.5,.3));
  dcs2->addChild(addBillboardBox(12.,1.,.2));
  
  pfDCS *sceneMatrix = new pfDCS();	    


  sceneMatrix->addChild(dcs2);
  
  //  topSceneGraph->addChild(sceneMatrix);
  topSceneGraph->addChild(dcs2);
  
  return topSceneGraph;
}


//adds a material for the geoset
//the turning on transparency is causing problems for billboard 
void
addmat(pfGeoSet *gset){  
  void *arena = pfGetSharedArena();
  pfGeoState *gst = new(arena) pfGeoState;
  gset->setGState(gst);
  //fprintf(stderr,"\n\n------------------BOTH\n\n");
  pfMaterial *mtl= new pfMaterial;
  static float c=0.;
  c+=1.;
  mtl->setSide(PFMTL_BOTH);
  mtl->setColor(PFMTL_EMISSION,.4*c,.2,.4);
#if 0
  //fprintf(stderr,"\n\n------------------BOTH\n\n");
  mtl->setColor(PFMTL_DIFFUSE, .2,.2,.2);
  mtl->setColor(PFMTL_SPECULAR, .2,.2,.2);
  mtl->setColor(PFMTL_AMBIENT, .2,.2,.2);
  
#endif	
  mtl->setColorMode(PFMTL_BOTH, PFMTL_CMODE_OFF);
  mtl->setAlpha(1.);
  mtl->setShininess(0.);
  gst->setAttr(PFSTATE_FRONTMTL, mtl);
  gst->setAttr(PFSTATE_BACKMTL, mtl);


  gst->setMode(PFSTATE_ENLIGHTING, 1);
#if 0
  gst->setMode(PFSTATE_ALPHAFUNC, PFAF_GREATER);
  gst->setVal(PFSTATE_ALPHAREF, .01);
#endif
#ifdef FAIL
  gst->setMode(PFSTATE_TRANSPARENCY, PFTR_ON);
#endif
}


//adds a DCS with translation x,y,z
pfDCS *
addDCS(float x, float  y, float z)
{
  pfDCS *dcs = new pfDCS;
  pfMatrix TR;
  TR.makeIdent();
  TR.preTrans(x,y,z,TR);
  dcs->setMat(TR);
  return dcs;
}


//adds a billboarded box
pfGeode *
addBillboardBox(float xV, float  yV, float zV)
{
  pfBillboard *geoDE;
  void *arena;
  pfVec3 *normals;
  pfVec2 *txtCoords;
  pfVec3 *Coords;
  ushort *normIndex, *ptIndex, *txtIndex;
  int i,j;
  static int count=0;
  geoDE = new pfBillboard;


  if (count==2)
    geoDE->setAxis(*(new pfVec3(1.,0.,0.))); 
  if (count==1)
    geoDE->setAxis(*(new pfVec3(0.,1.,0.))); 
  if (count==0)
    geoDE->setAxis(*(new pfVec3(0.,0.,1.))); 
fprintf(stderr,"COUNT:%d\n",count);
  count++;
  //  geoDE->setMode(PFBB_ROT, PFBB_AXIAL_ROT);
  //  geoDE->setMode(PFBB_ROT, PFBB_POINT_ROT_EYE);
  //geoDE->setMode(PFBB_ROT, PFBB_POINT_ROT_WORLD);
 
  arena = pfGetSharedArena();
#if 0    
  normals = (pfVec3*)pfMalloc(sizeof(pfVec3)*6, arena);
  normals[0].set( 0.0f,  0.0f,  1.0f); //Front
  normals[1].set( 0.0f,  0.0f, -1.0f); //Back
  normals[2].set(-1.0f,  0.0f,  0.0f); //Left
  normals[3].set( 1.0f,  0.0f,  0.0f); //Right
  normals[4].set( 0.0f,  1.0f,  0.0f); //Top
  normals[5].set( 0.0f, -1.0f,  0.0f); //Bottom
#endif
  Coords = (pfVec3*)pfMalloc(sizeof(pfVec3)*8, arena);


  float x, y, z;
  x = xV/2; y = yV/2; z = zV/2;
  Coords[0].set(-x, -y,  z);
  Coords[1].set( x ,-y,  z);
  Coords[2].set( x,  y,  z);
  Coords[3].set(-x,  y,  z);
  Coords[4].set(-x, -y, -z);
  Coords[5].set( x, -y, -z);
  Coords[6].set( x,  y, -z);
  Coords[7].set(-x,  y, -z);
#if 0      
  normIndex = (ushort*)pfMalloc(sizeof(ushort)*24, arena);


  j = -1;
  for (i=0; i<24; i++){
    if (i%4 == 0)
      j++;
    normIndex[i] = j;
  }
#endif    
  ptIndex = (ushort*)pfMalloc(sizeof(ushort)*24, arena);
    
  ptIndex[0] = 0; ptIndex[1]  = 1; ptIndex[2]  = 2; ptIndex[3]  = 3; /* front */
  ptIndex[4] = 5; ptIndex[5]  = 4; ptIndex[6]  = 7; ptIndex[7]  = 6; /* left */
  ptIndex[8] = 4; ptIndex[9]  = 0; ptIndex[10] = 3; ptIndex[11] = 7; /* back */
  ptIndex[12]= 1; ptIndex[13] = 5; ptIndex[14] = 6; ptIndex[15] = 2; /* right */
  ptIndex[16]= 3; ptIndex[17] = 2; ptIndex[18] = 6; ptIndex[19] = 7; /* top */
  ptIndex[20]= 4; ptIndex[21] = 5; ptIndex[22] = 1; ptIndex[23] = 0; /*bottom*/   


  pfGeoSet *gset;
  gset = new pfGeoSet;
  gset->setAttr(PFGS_COORD3, PFGS_PER_VERTEX, Coords, ptIndex);
  //  gset->setAttr(PFGS_TEXCOORD2, PFGS_PER_VERTEX, txtCoords, txtIndex);
  //  gset->setAttr(PFGS_NORMAL3, PFGS_PER_VERTEX, normals, normIndex);
  gset->setPrimType(PFGS_QUADS);
  gset->setNumPrims(6);
  //      gset->setGState(gsStack->top());
  geoDE->addGSet(gset);


  addmat(gset);      
    
  return geoDE;
}

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