cam_pos      = [-0.0184083, 0.893517, -0.351769]';
cam_dir      = [0.999296, 0.0314822, -0.0204153]';
cam_up       = [0.0229213, -0.0814102, 0.996417]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [-0.0395108, 1.32492, 0.109159]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;