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#ifndef lint
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static const char RCSid[] = "$Id: rglsurf.c,v 3.12 2004/03/30 20:40:03 greg Exp $";
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#endif
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/*
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* Convert Radiance -> OpenGL surfaces.
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*/
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#include "copyright.h"
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#include "radogl.h"
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#ifndef NSLICES
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#define NSLICES 18 /* number of quadric slices */
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#endif
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#ifndef NSTACKS
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#define NSTACKS 10 /* number of quadric stacks */
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#endif
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MATREC *curmat = NULL; /* current material */
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static int curpolysize = 0; /* outputting triangles/quads */
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static GLUquadricObj *gluqo; /* shared quadric object */
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static GLUtesselator *gluto; /* shared tessallation object */
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static char *glu_rout = "unk"; /* active GLU routine */
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#define NOPOLY() if (curpolysize) {glEnd(); curpolysize = 0;} else
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void
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setmaterial(mp, cent, ispoly) /* prepare for new material */
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register MATREC *mp;
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FVECT cent;
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int ispoly;
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{
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if (mp != curmat && domats) {
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NOPOLY();
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domatobj(curmat = mp, cent);
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} else if (!ispoly) {
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NOPOLY();
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}
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}
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double
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polyarea(cent, norm, n, v) /* compute polygon area & normal */
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FVECT cent, norm; /* returned center and normal */
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int n; /* number of vertices */
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register FVECT v[]; /* vertex list */
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{
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FVECT v1, v2, v3;
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double d;
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register int i;
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norm[0] = norm[1] = norm[2] = 0.;
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v1[0] = v[1][0] - v[0][0];
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v1[1] = v[1][1] - v[0][1];
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v1[2] = v[1][2] - v[0][2];
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for (i = 2; i < n; i++) {
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v2[0] = v[i][0] - v[0][0];
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v2[1] = v[i][1] - v[0][1];
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v2[2] = v[i][2] - v[0][2];
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fcross(v3, v1, v2);
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norm[0] += v3[0];
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norm[1] += v3[1];
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norm[2] += v3[2];
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VCOPY(v1, v2);
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}
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if (cent != NULL) { /* compute center also */
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cent[0] = cent[1] = cent[2] = 0.;
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for (i = n; i--; ) {
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cent[0] += v[i][0];
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cent[1] += v[i][1];
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cent[2] += v[i][2];
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}
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d = 1./n;
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cent[0] *= d; cent[1] *= d; cent[2] *= d;
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}
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return(normalize(norm)*.5);
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}
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static void
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glu_error(en) /* report an error as a warning */
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GLenum en;
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{
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sprintf(errmsg, "GLU error %s: %s", glu_rout, gluErrorString(en));
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error(WARNING, errmsg);
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}
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static void
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myCombine(coords, vertex_data, weight, dataOut)
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register GLdouble coords[3];
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GLdouble *vertex_data[4];
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GLfloat weight[4];
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GLdouble **dataOut;
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{
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register GLdouble *newvert;
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newvert = (GLdouble *)malloc(3*sizeof(GLdouble));
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if (newvert == NULL)
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error(SYSTEM, "out of memory in myCombine");
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VCOPY(newvert, coords); /* no data, just coordinates */
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*dataOut = newvert;
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}
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static void
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newtess() /* allocate GLU tessellation object */
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{
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if ((gluto = gluNewTess()) == NULL)
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error(INTERNAL, "gluNewTess failed");
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gluTessCallback(gluto, GLU_TESS_BEGIN, glBegin);
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gluTessCallback(gluto, GLU_TESS_VERTEX, glVertex3dv);
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gluTessCallback(gluto, GLU_TESS_END, glEnd);
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gluTessCallback(gluto, GLU_TESS_COMBINE, (void*)myCombine);
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gluTessCallback(gluto, GLU_TESS_ERROR, (void*)glu_error);
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gluTessProperty(gluto, GLU_TESS_WINDING_RULE, GLU_TESS_WINDING_NONZERO);
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}
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static void
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newquadric() /* allocate GLU quadric structure */
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{
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if ((gluqo = gluNewQuadric()) == NULL)
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error(INTERNAL, "gluNewQuadric failed");
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gluQuadricDrawStyle(gluqo, GLU_FILL);
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gluQuadricCallback(gluqo, GLU_ERROR, (void*)glu_error);
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}
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int
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o_face(o) /* convert a face */
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register OBJREC *o;
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{
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double area;
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FVECT norm, cent;
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register int i;
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if ((o->oargs.nfargs < 9) | (o->oargs.nfargs % 3))
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objerror(o, USER, "bad # real arguments");
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area = polyarea(cent, norm, o->oargs.nfargs/3, (FVECT *)o->oargs.farg);
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if (area <= FTINY)
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return(0);
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if (dolights) /* check for source */
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doflatsrc((MATREC *)o->os, cent, norm, area);
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setmaterial((MATREC *)o->os, cent, 1); /* set material */
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if (o->oargs.nfargs/3 != curpolysize) {
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if (curpolysize) glEnd();
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curpolysize = o->oargs.nfargs/3;
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if (curpolysize == 3)
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glBegin(GL_TRIANGLES);
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else if (curpolysize == 4)
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glBegin(GL_QUADS);
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}
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glNormal3d((GLdouble)norm[0], (GLdouble)norm[1], (GLdouble)norm[2]);
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if (curpolysize > 4) {
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if (gluto == NULL) newtess();
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glu_rout = "tessellating polygon";
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gluTessNormal(gluto, (GLdouble)norm[0],
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(GLdouble)norm[1], (GLdouble)norm[2]);
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gluTessBeginPolygon(gluto, NULL);
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gluTessBeginContour(gluto);
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#ifdef SMLFLT
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error(INTERNAL, "bad code segment in o_face");
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#endif
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for (i = 0; i < curpolysize; i++)
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gluTessVertex(gluto, (GLdouble *)(o->oargs.farg+3*i),
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(void *)(o->oargs.farg+3*i));
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gluTessEndContour(gluto);
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gluTessEndPolygon(gluto);
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curpolysize = 0;
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} else {
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for (i = 0; i < curpolysize; i++)
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glVertex3d((GLdouble)o->oargs.farg[3*i],
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(GLdouble)o->oargs.farg[3*i+1],
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(GLdouble)o->oargs.farg[3*i+2]);
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}
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return(0);
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}
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void
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surfclean() /* clean up surface routines */
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{
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setmaterial(NULL, NULL, 0);
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if (gluqo != NULL) {
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gluDeleteQuadric(gluqo);
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gluqo = NULL;
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}
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if (gluto != NULL) {
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gluDeleteTess(gluto);
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gluto = NULL;
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}
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rgl_checkerr("in surfclean");
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}
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int
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o_sphere(o) /* convert a sphere */
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register OBJREC *o;
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{
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/* check arguments */
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if (o->oargs.nfargs != 4)
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objerror(o, USER, "bad # real arguments");
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if (o->oargs.farg[3] < -FTINY) {
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o->otype = o->otype==OBJ_SPHERE ? OBJ_BUBBLE : OBJ_SPHERE;
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o->oargs.farg[3] = -o->oargs.farg[3];
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} else if (o->oargs.farg[3] <= FTINY)
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return(0);
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if (dolights)
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dosphsrc((MATREC *)o->os, o->oargs.farg,
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PI*o->oargs.farg[3]*o->oargs.farg[3]);
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setmaterial((MATREC *)o->os, o->oargs.farg, 0);
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if (gluqo == NULL) newquadric();
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glu_rout = "making sphere";
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gluQuadricOrientation(gluqo,
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o->otype==OBJ_BUBBLE ? GLU_INSIDE : GLU_OUTSIDE);
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gluQuadricNormals(gluqo, GLU_SMOOTH);
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glMatrixMode(GL_MODELVIEW);
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glPushMatrix();
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glTranslated((GLdouble)o->oargs.farg[0], (GLdouble)o->oargs.farg[1],
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(GLdouble)o->oargs.farg[2]);
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gluSphere(gluqo, (GLdouble)o->oargs.farg[3], NSLICES, NSTACKS);
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glPopMatrix();
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return(0);
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}
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int
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o_cone(o) /* convert a cone or cylinder */
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register OBJREC *o;
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{
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double x1, y1, h, d;
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FVECT cent;
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register int iscyl;
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iscyl = (o->otype==OBJ_CYLINDER) | (o->otype==OBJ_TUBE);
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if (o->oargs.nfargs != (iscyl ? 7 : 8))
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objerror(o, USER, "bad # real arguments");
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if (o->oargs.farg[6] < -FTINY) {
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o->oargs.farg[6] = -o->oargs.farg[6];
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if (iscyl)
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o->otype = o->otype==OBJ_CYLINDER ?
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OBJ_TUBE : OBJ_CYLINDER;
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else {
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if ((o->oargs.farg[7] = -o->oargs.farg[7]) < -FTINY)
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objerror(o, USER, "illegal radii");
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o->otype = o->otype==OBJ_CONE ? OBJ_CUP : OBJ_CONE;
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}
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} else if (!iscyl && o->oargs.farg[7] < -FTINY)
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objerror(o, USER, "illegal radii");
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if (o->oargs.farg[6] <= FTINY && (iscyl || o->oargs.farg[7] <= FTINY))
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return(0);
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if (!iscyl) {
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if (o->oargs.farg[6] < 0.) /* complains for tiny neg's */
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o->oargs.farg[6] = 0.;
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if (o->oargs.farg[7] < 0.)
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o->oargs.farg[7] = 0.;
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}
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h = sqrt(dist2(o->oargs.farg,o->oargs.farg+3));
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if (h <= FTINY)
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return(0);
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cent[0] = .5*(o->oargs.farg[0] + o->oargs.farg[3]);
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cent[1] = .5*(o->oargs.farg[1] + o->oargs.farg[4]);
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cent[2] = .5*(o->oargs.farg[2] + o->oargs.farg[5]);
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setmaterial((MATREC *)o->os, cent, 0);
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if (gluqo == NULL) newquadric();
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glu_rout = "making cylinder";
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gluQuadricOrientation(gluqo, (o->otype==OBJ_CUP) | (o->otype==OBJ_TUBE) ?
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GLU_INSIDE : GLU_OUTSIDE);
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gluQuadricNormals(gluqo, GLU_SMOOTH);
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glMatrixMode(GL_MODELVIEW);
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glPushMatrix();
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/* do base translation */
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glTranslated((GLdouble)o->oargs.farg[0], (GLdouble)o->oargs.farg[1],
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(GLdouble)o->oargs.farg[2]);
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/* compute height & rotation angle */
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x1 = o->oargs.farg[1] - o->oargs.farg[4];
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y1 = o->oargs.farg[3] - o->oargs.farg[0];
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/* z1 = 0; */
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d = x1*x1 + y1*y1;
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if (d <= FTINY*FTINY)
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x1 = 1.;
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else
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d = 180./PI * asin(sqrt(d) / h);
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if (o->oargs.farg[5] < o->oargs.farg[2])
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d = 180. - d;
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if (d > FTINY)
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glRotated(d, (GLdouble)x1, (GLdouble)y1, 0.);
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gluCylinder(gluqo, o->oargs.farg[6], o->oargs.farg[iscyl ? 6 : 7],
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h, NSLICES, 1);
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glPopMatrix();
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return(0);
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}
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int
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o_ring(o) /* convert a ring */
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register OBJREC *o;
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{
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double x1, y1, d, h;
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if (o->oargs.nfargs != 8)
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objerror(o, USER, "bad # real arguments");
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if (o->oargs.farg[7] < o->oargs.farg[6]) {
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register double d = o->oargs.farg[7];
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o->oargs.farg[7] = o->oargs.farg[6];
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o->oargs.farg[6] = d;
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}
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if (o->oargs.farg[6] < -FTINY)
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objerror(o, USER, "negative radius");
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if (o->oargs.farg[6] < 0.) /* complains for tiny neg's */
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o->oargs.farg[6] = 0.;
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if (o->oargs.farg[7] - o->oargs.farg[6] <= FTINY)
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return(0);
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h = VLEN(o->oargs.farg+3);
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if (h <= FTINY)
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return(0);
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if (dolights)
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doflatsrc((MATREC *)o->os, o->oargs.farg, o->oargs.farg+3,
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PI*(o->oargs.farg[7]*o->oargs.farg[7] -
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o->oargs.farg[6]*o->oargs.farg[6]));
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setmaterial((MATREC *)o->os, o->oargs.farg, 0);
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if (gluqo == NULL) newquadric();
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glu_rout = "making disk";
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gluQuadricOrientation(gluqo, GLU_OUTSIDE);
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gluQuadricNormals(gluqo, GLU_FLAT);
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glMatrixMode(GL_MODELVIEW);
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glPushMatrix();
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glTranslated((GLdouble)o->oargs.farg[0], (GLdouble)o->oargs.farg[1],
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(GLdouble)o->oargs.farg[2]);
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/* compute rotation angle */
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x1 = -o->oargs.farg[4];
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y1 = o->oargs.farg[3];
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/* z1 = 0; */
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d = x1*x1 + y1*y1;
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if (d <= FTINY*FTINY)
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x1 = 1.;
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else
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d = 180./PI * asin(sqrt(d) / h);
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if (o->oargs.farg[5] < 0.)
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d = 180. - d;
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if (d > FTINY)
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glRotated(d, (GLdouble)x1, (GLdouble)y1, 0.);
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gluDisk(gluqo, o->oargs.farg[6], o->oargs.farg[7], NSLICES, 1);
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glPopMatrix();
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return(0);
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}
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