morphing nodes

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ceti (ceti++at++worldnet.net)
Tue, 12 Mar 1996 17:05:51 +0000

Hello,
I ve a problem with the use of morphing nodes.
The following source is a variation around morph.c.
My goal was to load two object ( iv file format ) with the same geometry (
polygons, normal, material, color)
but with two differents shapes. To check this, I planed to use the following
code but it bombs even if I try to morph one model to itself !
Strangely, the following is working if instead of loading external object, I
try internal primitive as
going from a sphere to an arrow !!

So if anybody could send me a sample to morph two iv objects or just tell me
what is wrong in the following
I will appreciate a lot ..

*******************************************************************

#include <stdlib.h>
#include <math.h>
#include <Performer/pf.h>
#include <Performer/pfdu.h>

int nSph;

static void breatheMorph(pfMorph *morph, double t)
{
    float s = (sinf(t) + 1.0f) / 2.0f;
    float weights[2];

    weights[0] = s;
    weights[1] = 1.0f - s;

    pfMorphWeights(morph, 0, weights);
    pfMorphWeights(morph, 1, weights);
}

static pfMorph* initMorph(char *namesource, char *namecible)
{
    pfGeoSet *cible;
    pfGeoSet *source;
    pfGeode *geode;
    pfGeoState *gstate;
    pfMaterial *mtl;
    pfMorph *morph;
    ushort *icoords, *inorms;
    pfVec3 *coords, *obcoords, *norms, *obnorms;
    pfVec4 *colors;
    float *srcs[2];
    int i;
    void *arena = pfGetSharedArena();

    morph = pfNewMorph();
    geode = pfNewGeode();
        source = (pfGeoSet*)pfdLoadFile(namesource);
        /*source = pfdNewSphere(400, arena);*/
        if(source==NULL)
                {
                pfNotify(PFNFY_NOTICE, PFNFY_PRINT,"WARNING: could not load
\"%s\"",namesource);
                exit(0);
                }

        cible = (pfGeoSet*)pfdLoadFile(namecible);
        /*cible = pfdNewArrow(400, arena);*/
        if(cible==NULL)
                {
                pfNotify(PFNFY_NOTICE, PFNFY_PRINT,"WARNING: could not load
\"%s\"",namecible);
                exit(0);
                }

    gstate = pfNewGState(arena);

    pfGStateMode(gstate, PFSTATE_ENLIGHTING, 1);
    pfGSetGState(source, gstate);

    pfAddGSet(geode, source);
    pfAddChild(morph, geode);

    pfGSetBBox(source, NULL, PFBOUND_STATIC);
    pfNodeBSphere(geode, NULL, PFBOUND_STATIC);

    pfGetGSetAttrLists(source, PFGS_COORD3, (void**)&coords, &icoords);
    pfGetGSetAttrLists(cible, PFGS_COORD3, (void**)&obcoords, &icoords);
    pfGetGSetAttrLists(source, PFGS_NORMAL3, (void**)&norms, &inorms);
    pfGetGSetAttrLists(cible, PFGS_NORMAL3, (void**)&obnorms, &icoords);

    nSph = pfGetSize(coords) / sizeof(pfVec3);

    srcs[0] = (float*)coords;
    srcs[1] = (float*)obcoords;
    pfMorphAttr(morph, 0, 3, nSph, NULL, 2, srcs, NULL, NULL);

    pfGSetAttr(source, PFGS_COORD3, PFGS_PER_VERTEX,
(void*)pfGetMorphDst(morph, 0), icoords);

    srcs[0] = (float*)norms;
    srcs[1] = (float*)obnorms;
    pfMorphAttr(morph, 1, 3, nSph, NULL, 2, srcs, NULL, NULL);

    pfGSetAttr(source, PFGS_NORMAL3, PFGS_PER_VERTEX,
(void*)pfGetMorphDst(morph, 1), inorms);

    return morph;
}

void OpenPipeWin (pfPipeWindow *pw)
{
    pfOpenPWin(pw);
    pfApplyLModel(pfNewLModel(NULL));
}

void
DrawChannel (pfChannel *chan, void *data)
{
    pfVec4 clr;

    pfSetVec4(clr, .2f, .2f, .2f, 1.0f);
    pfClear(PFCL_COLOR|PFCL_DEPTH, clr);
    pfDraw();
}

int
main (int argc, char *argv[])
{
    double t = 0.;
    pfScene *scene;
    pfDCS *morphDCS;
    pfMorph *morph;
    pfPipe *p;
    pfPipeWindow *pw;
    pfChannel *chan;
    pfSphere bsphere;
    pfCoord view;
    pfLightSource *ls;

   if(argc<3)
        {
        printf("use: %s <objet source> <objet cible>\n",argv[0]);
        exit(0);
        }

    pfInit();
    pfMultiprocess(PFMP_DEFAULT);
    pfConfig();

    scene = pfNewScene();
    morphDCS = pfNewDCS();
    morph = initMorph(argv[1],argv[2]);
    pfAddChild(morphDCS, morph);
    pfAddChild(scene, morphDCS);

    pfGetNodeBSphere (scene, &bsphere);

    p = pfGetPipe(0);
    pw = pfNewPWin(p);
    pfPWinName(pw, argv[0]);
    pfPWinConfigFunc(pw, OpenPipeWin);
    pfPWinOriginSize(pw, 0, 0, 500, 500);
    pfConfigPWin(pw);

    chan = pfNewChan(p);
    pfChanScene(chan, scene);
    pfChanNearFar(chan, 1.0f, 10.0f * bsphere.radius);
    pfChanFOV(chan, 45.0f, 0.0f);
    pfCopyVec3(view.xyz, bsphere.center);
    view.xyz[PF_Y] -= 3.0f * bsphere.radius;
    pfSetVec3(view.hpr, 0.0f, 0.0f, 0.0f);
    pfChanView(chan, view.xyz, view.hpr);
    pfChanTravFunc(chan, PFTRAV_DRAW, DrawChannel);

    ls = pfNewLSource();
    pfLSourcePos(ls, view.xyz[0], view.xyz[1], view.xyz[2], 1.0f);
    pfAddChild(scene, ls);

    while (t < 20.0f)
        {
        pfMatrix mat;
        /* Spin morph object */
        t = pfGetTime();
        pfMakeRotMat(mat, t*57.0f, 1.0f, -0.3f, 1.0f);
        pfDCSMat(morphDCS, mat);
        breatheMorph(morph, t);
        pfFrame();
        }
    pfExit();
    return 0;
}

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