cam_pos      = [0.66325, 1.44532, 1.30784]';
cam_dir      = [-0.65983, -0.154115, 0.735441]';
cam_up       = [-0.253753, 0.966945, -0.025037]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [0.940672, 0.270178, 0.900578]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;