cam_pos      = [0.436283, 1.67861, 1.8999]';
cam_dir      = [0.590471, -0.226999, -0.774478]';
cam_up       = [-0.0819513, 0.937805, -0.337351]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [-1.06784, -0.349344, -0.711742]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;