I think, I am doing everything write here. Still, it doesn't work. Please Help! #include "stdafx.h" #include<stdlib.h> #include <iostream> #include<glut.h> #include<windows.h> #include<math.h> #include<fstream> #include<gl.h> #include<glu.h> using namespace std; //<<<<<<<<<<<<<<<<<<setting the display window>>>>>>>>>>>>> void setWindow(int left,int right,int bottom,int top) { glMatrixMode(GL_PROJECTION); glLoadIdentity(); gluOrtho2D(left,right,bottom,top); } //<<<<<<<<<<<<<<<the intializing function>>>>>>>>>>>>>>> void myInit(void) { glClearColor(0.2,0.2,0.0,0.0); glColor3f(0.0f,1.0f,0.0f); glPointSize(2.0); } //<<<<<<<<<<<<<<<<<<newmethod>>>>>>>>>>>>>>>>>>> void newmethod(char *fileName) { fstream inStream; inStream.open(fileName, ios::in); // Open The File if(inStream.fail()) return; glClear(GL_COLOR_BUFFER_BIT); // Clear the screen GLint numpolys, numLines, x,y; inStream >> numpolys; // read the number of polylines for(int j = 0; j < numpolys; j++)//read each polyline { inStream>>numLines; glBegin(GL_LINE_STRIP); //draw the next polyline for (int i = 0; i < numLines; i++) { inStream >> x >> y; // read the next x, y pair glVertex2i(x,y); } glEnd(); } glFlush(); inStream.close(); } //<<<<<<<<<<<<drawPolyLine>>>>>>>>>>>>>>>> void drawPolyLine(void) { glClear(GL_COLOR_BUFFER_BIT); for(int i=1;i<10;i++) { for(int j=1;j<10;j++) { int a=i*70; int b=j*80; glViewport(a,b,70,80); newmethod("dino.dat"); glFlush(); } } } // //<<<<<<<<<<<<<main>>>>>>>>>>>>>>>>> void main(int argc, char **argv) { glutInit(&argc, argv); //Initialize the toolkit glutInitDisplayMode(GLUT_SINGLE | GLUT_RGB);//Set display mode glutInitWindowSize(1024,768); glutInitWindowPosition(100,150); glutCreateWindow("Dino"); //Open the screen Window glutDisplayFunc(drawPolyLine); //Register Redraw function myInit(); setWindow(0,700,0,800); glutMainLoop(); //Go into Perpetual Loop }

What doesn't work? What do you expect it to do? What are you getting as result instead?

Are you checking GL errors?

i am just starting with opengl. I am learning from this book-Computer graphics using openGl. The program is mentioned in the book. It is supposed to copy the image in different viewports and give a sequence but instead it is showing only 1 image.