cam_pos      = [-0.0794509, 1.70858, 1.89894]';
cam_dir      = [0.782578, -0.450954, -0.429199]';
cam_up       = [0.218464, 0.8445, -0.488972]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [-0.775339, -0.384229, -1.01001]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;