void linie() {

    for (int i = 0; i <8; i++) {

        if ((i+1)%4!=0) {
            glPushMatrix();
            glBegin(GL_LINES);
            glColor3f(0, 0, 1);
            glVertex3f(p[i][0], p[i][1], p[i][2]);
            glVertex3f(p[i + 1][0], p[i + 1][1], p[i + 1][2]);
            glEnd();
            glPopMatrix();


        }
        else if((i+1)%4==0){
            glPushMatrix();
            glBegin(GL_LINES);
            glColor3f(0, 1, 0);
            glVertex3f(p[i][0], p[i][1], p[i][2]);
            glVertex3f(p[i - 3][0], p[i - 3][1], p[i - 3][2]);
            glEnd();
            glPopMatrix();
        }

    }
    for (int i = 0; i < 4; i++) {
        glPushMatrix();
        glBegin(GL_LINES);
        glColor3f(1, 0, 0);
        glVertex3f(p[i][0], p[i][1], p[i][2]);
        glVertex3f(p[i + 4][0], p[i + 4][1], p[i + 4][2]);
        glEnd();
        glPopMatrix();

    }

}