cam_pos      = [-1.21765, 1.52686, 0.896553]';
cam_dir      = [0.740115, 0.135345, 0.65872]';
cam_up       = [0.0749803, 0.956821, -0.280841]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [0.888822, -0.342137, -0.928352]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;