Re: How can I get the vertex position of the object

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Angus Henderson (angus++at++death.reading.sgi.com)
Mon, 11 Mar 1996 09:12:22 +0000

Here's a bit of my shark which does that in Pefermer 1.2....

ANGus

#include <Performer/pf.h>
#include <Performer/prmath.h>
#include "pfutil.h"
#include "pfflt.h"
#include "pfsgi.h"

#include "generic.h"

#include "perfly.h"
#include "gui.h"
#include "keybd.h"

static long getNumVerts(pfGeoSet *);
static void getVerts(pfGeode*, short, short);

void
makeVertList(pfNode *node, short q, short copy)
{
    long type, i, j;

    type = pfGetType(node);

    if(type == PFTYPE_GEODE)
    {
        getVerts((pfGeode*)node, q, copy);
    }
    else if(type & PFCLASS_GROUP)
    {
        long nc;

        /*
         * Recurse on children. Act on return value.
        */
            for(i = 0; i < (nc = pfGetNumChildren(node)); i++)
        {
            pfNode *child = pfGetChild(node, i);

            makeVertList(child, q, copy);
        }
    }
}

static void
getVerts(pfGeode * geode, short q, short copy)
{
    long i, j, ng;
    pfGeoSet *gset;
    long nverts;
    void *coords;
    ushort *indices;

    ng = pfGetNumGSets( geode);
    printf("found a geode with %d gsets\n",ng);

    if(ng > 0)
    {
        for(i = 0; i < ng; i++)
        {
            gset = pfGetGSet( geode, i);

            nverts = getNumVerts(gset);

            pfGetGSetAttrLists( gset, PFGS_COORD3, &coords, &indices);

            if(indices)
                printf("- INDEXED\n");
            else
                printf("- NON-INDEXED\n");

            if(sharkAnimation[q][copy].vertList == NULL)
            {
                sharkAnimation[q][copy].vertList = (float**)pfMalloc(
                    nverts * sizeof( float* ) ,pfGetSharedArena() );
                sharkAnimation[q][copy].numVerts = 0;
            }
            else
                sharkAnimation[q][copy].vertList = (float**)pfRealloc(
                    (void*)sharkAnimation[q][copy].vertList, (nverts +
sharkAnimation[q][copy].numVerts) * sizeof(float*));

            for(j = 0; j < nverts; j++)
            {
                *(sharkAnimation[q][copy].vertList +
sharkAnimation[q][copy].numVerts + j) = (float*)coords + j*3;
            }

            sharkAnimation[q][copy].numVerts += nverts;

            printf("Verts in this GSet: %d Total vertices: %d\n", nverts,
sharkAnimation[q][copy].numVerts);
        }

    }
}

long
getNumVerts(pfGeoSet *gset)
{
    long i, nprims, nverts;
    long *lengths;
    long sumLengths = 0;

    nprims = pfGetGSetNumPrims( gset );
    lengths = pfGetGSetPrimLengths( gset );

    if(lengths)
    {
        for(i = 0; i<nprims; i++)
        {
            sumLengths += *(lengths + i);
        }
    }
    switch (pfGetGSetPrimType( gset ) )
    {
        case PFGS_POINTS:
            printf("PFGS_POINTS");
            nverts = nprims;
            break;
        case PFGS_LINES:
            printf("PFGS_LINES");
            nverts = nprims * 2;
            break;
        case PFGS_LINESTRIPS:
            printf("PFGS_LINESTRIPS");
            nverts = sumLengths;
            break;
        case PFGS_FLAT_LINESTRIPS:
            printf("PFGS_FLAT_LINESTRIPS");
            nverts = sumLengths;
            break;
        case PFGS_TRIS:
            printf("PFGS_TRIS");
            nverts = nprims * 3;
            break;
        case PFGS_QUADS:
            printf("PFGS_QUADS");
            nverts = nprims * 4;
            break;
        case PFGS_TRISTRIPS:
            printf("PFGS_TRISTRIPS");
            nverts = sumLengths;
            break;
        case PFGS_FLAT_TRISTRIPS:
            printf("PFGS_FLAT_TRISTRIPS");
            nverts = sumLengths;
            break;
        default:
            printf("Primitive type Unknown: %d ", pfGetGSetPrimType( gset ));
            nverts = 0;
    }

    return nverts;
}

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