void GLScene::display(){
        float col[] = {1.0, 0.0, 0.0, 1.0};
        glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
        for(int i=0; i<GLScene::objects_num; i++){
          if (GLScene::objects[i][0].show){
            glPushMatrix();
            glMaterialfv(GL_FRONT, GL_SPECULAR, col);
            glMaterialf(GL_FRONT, GL_SHININESS, 1.0);
            //glMaterialfv(GL_FRONT_AND_BACK, GL_AMBIENT_AND_DIFFUSE, col);
            float gip = sqrt(pow(GLScene::objects[i][0].up.x, 2)
                            +pow(GLScene::objects[i][0].up.y, 2)
                            +pow(GLScene::objects[i][0].up.z, 2));
            glTranslatef(
              -GLScene::objects[i][0].position.x,
              -GLScene::objects[i][0].position.y,
              -GLScene::objects[i][0].position.z
            );
            glRotatef(-asin(GLScene::objects[i][0].up.x/gip)*180/3.14159, 0.0, 0.0, 1.0);
            glRotatef(-asin(GLScene::objects[i][0].up.z/gip)*180/3.14159, 1.0, 0.0, 0.0);
            if (GLScene::objects[i][0].angle>0.0){
            glRotatef(
              GLScene::objects[i][0].angle,
              0.0,
              1.0,
              0.0
            );
            }
            glVertexPointer(3, GL_FLOAT, 0, GLScene::objects[i][0].vertex);
            glDrawArrays(GL_TRIANGLES, 0, GLScene::objects[i][0].vertex_num);
            glPopMatrix();
          }
        };

        glFlush();
        glutSwapBuffers();
      }

      void GLScene::init(int* argc, char** argv, GLPoint left_bottom_near, GLPoint right_top_far){
        GLScene::objects_num = 0;
        GLScene::objects = new GLObject*[100000];

        GLScene::materials = new GLMaterial*[100000];

        glutInit(argc, argv);
        glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGBA | GLUT_DEPTH);
        glutInitWindowSize(500,500);
        glutCreateWindow("simple");
        glMatrixMode(GL_PROJECTION);
        glLoadIdentity();
        glFrustum(left_bottom_near.x, right_top_far.x, left_bottom_near.y, right_top_far.y, left_bottom_near.z, right_top_far.z);
        glutDisplayFunc(GLScene::display);
        glEnableClientState(GL_VERTEX_ARRAY);
        glEnable(GL_LIGHTING);

        int position[3] = {3000, 0.0, 0.0};

        glEnable(GL_LIGHT0);
        //glLightf(GL_LIGHT0, GL_SPOT_EXPONENT, 0.9);
        glLightiv(GL_LIGHT0, GL_POSITION, position);
      }