cam_pos      = [0.18667, 1.01952, 0.658728]';
cam_dir      = [0.568983, 0.411289, -0.71211]';
cam_up       = [-0.744, -0.111433, -0.658823]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [0.465924, -1.20321, -0.322653]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;