cg/7.c at master · mohammedlutf/cg · GitHub

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#include<stdlib.h>
#include<stdio.h>
#include<GL/glut.h>

typedef float point[3];

point v[]={{0.0,0.0,1.0},{0.0,0.9,-0.3},{-0.8,-0.5,-0.3},{0.8,-0.5,-0.3}};

    int n ;

   void triangle(point a,point b,point c)
    {
         glBegin(GL_POLYGON);
                glVertex3fv(a);
                glVertex3fv(b);
                glVertex3fv(c);
                glEnd();
    }

  void divide_triangle(point a,point b,point c,int m)
  {
         point v1, v2, v3;
         int j;
         if(m > 0)
         {
               for(j=0; j<3; j++) v1[j]=(a[j]+b[j])/2;
               for(j=0; j<3; j++) v2[j]=(a[j]+c[j])/2;
               for(j=0; j<3; j++) v3[j]=(b[j]+c[j])/2;
               divide_triangle(a, v1, v2, m-1);
               divide_triangle(c, v2, v3, m-1);
               divide_triangle(b, v3, v1, m-1);
          }
          else
               triangle(a,b,c);
  }

  void tetrahedron(int m)
  {
      glColor3f(1.0,0.0,0.0);
      divide_triangle(v[0], v[1], v[2], m);

      glColor3f(0.0,0.0,0.0);
      divide_triangle(v[3], v[2], v[1], m);

      glColor3f(0.0,0.0,1.0);
      divide_triangle(v[0], v[3], v[1], m);

      glColor3f(0.0,1.0,0.0);
      divide_triangle(v[0], v[2], v[3], m);
  }

  void display(void)
  {
    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
    tetrahedron(n);
    glFlush();
  }

  void myReshape(int w, int h)
  {
    glClearColor(1.0, 1.0, 1.0, 1.0);
    glViewport(0,0,w,h);
    glMatrixMode(GL_PROJECTION);
    glLoadIdentity();
    if (w <= h)
      glOrtho(-2.0, 2.0, -2.0 *(GLfloat) h / (GLfloat) w, 2.0 * (GLfloat) h / (GLfloat) w, -10.0, 10.0);
    else
     glOrtho(-2.0 * (GLfloat) w / (GLfloat) h,2.0 * (GLfloat) w / (GLfloat) h, -2.0, 2.0, -10.0, 10.0);
    glMatrixMode(GL_MODELVIEW);
    glutPostRedisplay();

 }

 int main(int argc, char **argv)
 {
    printf(" no. of division ? ");
    scanf("%d", &n);
    glutInit(&argc, argv);
    glutInitDisplayMode(GLUT_SINGLE | GLUT_RGB | GLUT_DEPTH);
    glutInitWindowSize(500, 500);
    glutCreateWindow(" 3D gasket");
    glutReshapeFunc(myReshape);
    glutDisplayFunc(display);
    glEnable(GL_DEPTH_TEST);
    glutMainLoop();
    return 0;
    }