void CObject::generateSphere(float r, int N)
{
 for(int j = 0 ; j <= N ; j++)
 {
     for(int i = 0 ; i < N ; i++)
     {
         float theta1 = M_PI * float(j) / float(N);
         float theta2 = M_PI * float(j-1) / float(N);
         float phi = M_PI * 2 * float(i) / float(N);

         float nx1 = sin(theta1) * cos(phi);
         float nx2 = sin(theta2) * cos(phi);
         float nz1 = sin(theta1) * sin(phi);
         float nz2 = sin(theta2) * sin(phi);
         float ny1 = cos(theta1);
         float ny2 = cos(theta2);

         float x1 = r * nx1;
         float x2 = r * nx2;
         float y1 = r * ny1;
         float y2 = r * ny2;
         float z1 = r * nz1;
         float z2 = r * nz2;

         add(QVector3D(x1, y1, z1), QVector3D(0, 0, 0));
         add(QVector3D(x2, y2, z2), QVector3D(0, 0, 0));
     }
 }

 m_primitive = GL_TRIANGLE_STRIP;
}