cam_pos      = [0.236525, 1.06064, 0.569806]';
cam_dir      = [0.568982, 0.411289, -0.71211]';
cam_up       = [-0.744736, 0.624951, -0.234102]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [-0.463838, -0.8825, -0.880311]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;