//Loading the modelGLMModel* model;model=glmReadOBJ("glm-data/f-16.obj");glmVertexNormals(model,180.0,false);//Optional-recalculates and smooths the normals//Drawing the modelglPushMatrix();//transformations here...glmDraw(model,GLM_SMOOTH|GLM_TEXTURE|GLM_MATERIAL);glPopMatrix();

/* glmReadOBJ: Reads a model description from a Wavefront .OBJ file. * Returns a pointer to the created object which should be free'd with * glmDelete(). * * filename - name of the file containing the Wavefront .OBJ format data.   */GLMmodel* glmReadOBJ(const char* filename){    GLMmodel* model;    FILE*   file;    int i, j;    /* open the file */    file = fopen(filename, "r");    if (!file) {        __glmFatalError( "glmReadOBJ() failed: can't open data file \"%s\".",			 filename);    }    /* allocate a new model */    model = (GLMmodel*)malloc(sizeof(GLMmodel));    model->pathname    = __glmStrdup(filename);    model->mtllibname    = NULL;    model->numvertices   = 0;    model->vertices    = NULL;    model->numnormals    = 0;    model->normals     = NULL;    model->numtexcoords  = 0;    model->texcoords       = NULL;    model->numfacetnorms = 0;    model->facetnorms    = NULL;    model->numtriangles  = 0;    model->triangles       = NULL;    model->nummaterials  = 0;    model->materials       = NULL;    model->numtextures  = 0;    model->textures       = NULL;    model->numgroups       = 0;    model->groups      = NULL;    model->position[0]   = 0.0;    model->position[1]   = 0.0;    model->position[2]   = 0.0;        /* make a first pass through the file to get a count of the number       of vertices, normals, texcoords & triangles */    glmFirstPass(model, file);        /* allocate memory */    model->vertices = (GLfloat*)malloc(sizeof(GLfloat) *				       3 * (model->numvertices + 1));    model->triangles = (GLMtriangle*)malloc(sizeof(GLMtriangle) *					    model->numtriangles);    if (model->numnormals) {        model->normals = (GLfloat*)malloc(sizeof(GLfloat) *					  3 * (model->numnormals + 1));    }    if (model->numtexcoords) {        model->texcoords = (GLfloat*)malloc(sizeof(GLfloat) *					    2 * (model->numtexcoords + 1));    }        /* rewind to beginning of file and read in the data this pass */    rewind(file);        glmSecondPass(model, file);    /* facet normals are not in the file, we have to compute them anyway */    glmFacetNormals(model);    /* verify the indices */    for (i = 0; i < model->numtriangles; i++) {	if (T(i).findex != -1)	    if (T(i).findex <= 0 || T(i).findex > model->numfacetnorms)		__glmFatalError("facet index for triangle %d out of bounds (%d > %d)\n", i, T(i).findex, model->numfacetnorms);	for (j=0; j<3; j++) {	    if (T(i).nindices[j] != -1)		if (T(i).nindices[j] <= 0 || T(i).nindices[j] > model->numnormals)		    __glmFatalError("normal index for triangle %d out of bounds (%d > %d)\n", i, T(i).nindices[j], model->numnormals);	    if (T(i).vindices[j] != -1)		if (T(i).vindices[j] <= 0 || T(i).vindices[j] > model->numvertices)		    __glmFatalError("vertex index for triangle %d out of bounds (%d > %d)\n", i, T(i).vindices[j], model->numvertices);	}    }    /* close the file */    fclose(file);        return model;}

GLM: Warning: glmDraw() warning: texture render mode requested with no texture coordinates defined.

# Mon Jun 17 10:04:54 1996##mtllib f-16.mtlgv -1.896410 3.055388 0.729943v -1.912970 2.997458 0.729941v -1.896410 2.994088 0.729943...

newmtl glassKa 0.4000 0.4000 0.4000Kd 0.3000 0.2302 0.2302Ks 0.3000 0.3000 0.3000illum 2d 0.2100Ns 117.0500newmtl grayKa 0.4000 0.4000 0.4000Kd 0.3000 0.2302 0.2302Ks 0.3000 0.3000 0.3000illum 2Ns 60.0000newmtl redKa 0.4000 0.4000 0.4000Kd 0.3000 0.0343 0.0343Ks 0.3000 0.3000 0.3000illum 2Ns 60.0000newmtl blueKa 0.4000 0.4000 0.4000Kd 0.0343 0.1861 0.3000Ks 0.3000 0.3000 0.3000illum 2Ns 60.0000newmtl blackKa 0.4000 0.4000 0.4000Kd 0.0019 0.0101 0.0163Ks 0.3000 0.3000 0.3000illum 2Ns 60.0000

/* glmFirstPass: first pass at a Wavefront OBJ file that gets all the * statistics of the model (such as #vertices, #normals, etc) * * model - properly initialized GLMmodel structure * file  - (fopen'd) file descriptor  */static GLvoidglmFirstPass(GLMmodel* model, FILE* file) {    GLuint  numvertices;        /* number of vertices in model */    GLuint  numnormals;         /* number of normals in model */    GLuint  numtexcoords;       /* number of texcoords in model */    GLuint  numtriangles;       /* number of triangles in model */    GLMgroup* group;            /* current group */    unsigned    v, n, t;    char        buf[128];        /* make a default group */    group = glmAddGroup(model, "default");        numvertices = numnormals = numtexcoords = numtriangles = 0;    while(fscanf(file, "%s", buf) != EOF) {        switch(buf[0]) {        case '#':               /* comment */            /* eat up rest of line */            fgets(buf, sizeof(buf), file);            break;        case 'v':               /* v, vn, vt */            switch(buf[1]) {            case '\0':          /* vertex */                /* eat up rest of line */                fgets(buf, sizeof(buf), file);                numvertices++;                break;            case 'n':           /* normal */                /* eat up rest of line */                fgets(buf, sizeof(buf), file);                numnormals++;                break;            case 't':           /* texcoord */                /* eat up rest of line */                fgets(buf, sizeof(buf), file);                numtexcoords++;                break;            default:                __glmFatalError("glmFirstPass(): Unknown token \"%s\".", buf);                break;            }            break;	case 'm':	    if(strncmp(buf, "mtllib", 6) != 0)		__glmFatalError("glmReadOBJ: Got \"%s\" instead of \"mtllib\"", buf);	    fgets(buf, sizeof(buf), file);	    sscanf(buf, "%s %s", buf, buf);	    model->mtllibname = __glmStrStrip((char*)buf);	    glmReadMTL(model, model->mtllibname);	    break;	case 'u':	    if(strncmp(buf, "usemtl", 6) != 0)		__glmFatalError("glmReadOBJ: Got \"%s\" instead of \"usemtl\"", buf);	    /* eat up rest of line */	    fgets(buf, sizeof(buf), file);	    break;	case 'g':               /* group */	    /* eat up rest of line */	    fgets(buf, sizeof(buf), file);#if SINGLE_STRING_GROUP_NAMES	    sscanf(buf, "%s", buf);#else	    buf[strlen(buf)-1] = '\0';  /* nuke '\n' */#endif	    group = glmAddGroup(model, buf);	    break;	case 'f':               /* face */	    v = n = t = 0;	    fscanf(file, "%s", buf);	    /* can be one of %d, %d//%d, %d/%d, %d/%d/%d %d//%d */

/* glmSecondPass: second pass at a Wavefront OBJ file that gets all * the data. * * model - properly initialized GLMmodel structure * file  - (fopen'd) file descriptor  */static GLvoidglmSecondPass(GLMmodel* model, FILE* file) {    GLuint  numvertices;        /* number of vertices in model */    GLuint  numnormals;         /* number of normals in model */    GLuint  numtexcoords;       /* number of texcoords in model */    GLuint  numtriangles;       /* number of triangles in model */    GLfloat*    vertices;           /* array of vertices  */    GLfloat*    normals;            /* array of normals */    GLfloat*    texcoords;          /* array of texture coordinates */    GLMgroup* group;            /* current group pointer */    GLuint  material;           /* current material */    unsigned int v, n, t;    char        buf[128];        /* set the pointer shortcuts */    vertices       = model->vertices;    normals    = model->normals;    texcoords    = model->texcoords;    group      = model->groups;        /* on the second pass through the file, read all the data into the    allocated arrays */    numvertices = numnormals = numtexcoords = 1;    numtriangles = 0;    material = 0;    while(fscanf(file, "%s", buf) != EOF) {        switch(buf[0]) {        case '#':               /* comment */            /* eat up rest of line */            fgets(buf, sizeof(buf), file);            break;        case 'v':               /* v, vn, vt */            switch(buf[1]) {            case '\0':          /* vertex */                fscanf(file, "%f %f %f",                     &vertices[3 * numvertices + 0],                     &vertices[3 * numvertices + 1],                     &vertices[3 * numvertices + 2]);                numvertices++;                break;            case 'n':           /* normal */                fscanf(file, "%f %f %f",                     &normals[3 * numnormals + 0],                    &normals[3 * numnormals + 1],                     &normals[3 * numnormals + 2]);                numnormals++;                break;            case 't':           /* texcoord */                fscanf(file, "%f %f",                     &texcoords[2 * numtexcoords + 0],                    &texcoords[2 * numtexcoords + 1]);                numtexcoords++;                break;            }            break;            case 'u':                fgets(buf, sizeof(buf), file);                sscanf(buf, "%s %s", buf, buf);                material = glmFindMaterial(model, buf);#ifdef MATERIAL_BY_FACE                if(!group->material && group->numtriangles)                    group->material = material;#else                group->material = material;#endif                break;            case 'g':               /* group */                /* eat up rest of line */                fgets(buf, sizeof(buf), file);#if SINGLE_STRING_GROUP_NAMES                sscanf(buf, "%s", buf);#else                buf[strlen(buf)-1] = '\0';  /* nuke '\n' */#endif                group = glmFindGroup(model, buf);#ifndef MATERIAL_BY_FACE                group->material = material;#endif                break;            case 'f':               /* face */                v = n = t = 0;		T(numtriangles).findex = -1;#ifdef MATERIAL_BY_FACE                if(group->material == 0)                    group->material = material;                T(numtriangles).material = material;#endif                fscanf(file, "%s", buf);                /* can be one of %d, %d//%d, %d/%d, %d/%d/%d %d//%d */