cam_pos      = [0.241756, 1.05298, 0.522893]';
cam_dir      = [0.568982, 0.411289, -0.71211]';
cam_up       = [-0.696718, 0.701111, -0.151748]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [-0.581018, -0.7747, -0.911678]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;