AS soon as I run the program my window come and disappear right away. here is the code.
#include <glu.h>
#include <stdlib.h>
#include “glut.h”
GLfloat ctlpts[4][4][3];
GLUnurbsObj *theNurb;
void display(void) { GLfloat knots[8] = {0.0,0.0,0.0,0.0,1.0,1.0,1.0,1.0};
glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);
glPushMatrix();
glRotatef(330.0,1.,0.,0.);
glScalef(0.5,0.5,0.5);
gluBeginSurface(theNurb);
gluNurbsSurface(theNurb,8,knots,8,knots,4*3,3,&ctlpts[0][0][0],4,4,GL_MAP2_VERTEX_3);
gluEndSurface(theNurb);
glPopMatrix();
glFlush();
}
void init_surface(void) {
int u,v;
for( u = 0 ; u < 4 ; u++ ) {
for( v = 0 ; v < 4 ; v++ ) {
ctlpts[u][v][0] = 2.(u-1.5);
ctlpts[u][v][1] = 2.(v-1.5);
if ((u==1 | | u==2)&&(v==1 | | v==2))
ctlpts[u][v][2] = 3.0;
else
ctlpts[u][v][2] = -3.0; } }
}
void myinit(void) {
GLfloat dif[] = {0.7,0.7,0.7,1.0};
GLfloat spe[] = {1.0,1.0,1.0,1.0};
GLfloat shininess[] = {100.0};
glClearColor(0.0,0.0,0.0,1.0);
glMaterialfv(GL_FRONT,GL_DIFFUSE,dif);
glMaterialfv(GL_FRONT,GL_SPECULAR, spe);
glMaterialfv(GL_FRONT,GL_SHININESS,shininess);
glEnable(GL_LIGHTING);
glEnable(GL_LIGHT0);
glDepthFunc(GL_LESS);
glEnable(GL_DEPTH_TEST);
glEnable(GL_AUTO_NORMAL);
glEnable(GL_NORMALIZE);
init_surface();
theNurb = gluNewNurbsRenderer();
gluNurbsProperty(theNurb,GLU_SAMPLING_TOLERANCE,25.0);
gluNurbsProperty(theNurb,GLU_DISPLAY_MODE,GLU_FILL);
}
void myReshape(int w,int h) {
glViewport(0,0,w,h);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
gluPerspective(45.0,(float)w/(float)h,3.0,8.0);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
glTranslatef(0.0,0.0,-5.0);
}
int main(int argc,char** argv) {
glutInit(&argc, argv);
glutCreateWindow("molehill");
glutInitDisplayMode(GLUT_SINGLE|GLUT_RGB);
myinit();
glutInitWindowPosition(0,0);
glutReshapeFunc(myReshape);
glutDisplayFunc(display);
glutMainLoop();
}
Thank you