void modeler(){
  float red[4] = {0.8,0.0,0.0,1.0};
  float green[4] = {0.0,0.8,0.0,1.0};
  float blue[4] = {0.0,0.0,0.8,1.0};
  float mdl_specular[4] = {0.3,0.3,0.3,1.0};
  glMaterialfv(GL_FRONT,GL_SPECULAR,mdl_specular);
  glMaterialfv(GL_FRONT,GL_DIFFUSE,red);
  glPushMatrix();

  glTranslated(0.0,0.0,2.0);
  glRotated(90.0,1.0,0.0,0.0);
  pdraw(torus);
  glPopMatrix();
  glPushMatrix();
  glTranslated(0.0,0.0,2.0);
  pdraw(torus);
  glPopMatrix();
  glPushMatrix();
  glTranslated(0.0,0.0,2.0);
  glScaled(2.0,2.0,2.0);
  glMaterialfv(GL_FRONT,GL_DIFFUSE,green);
  pdraw(sphere);
  glPopMatrix();
  glTranslated(0.0,0.0,-6.0);
  glScaled(5.0,5.0,3.0);
  glMaterialfv(GL_FRONT,GL_DIFFUSE,blue);
  pdraw(cylinder);

}