cam_pos      = [0.0342753, 1.1623, -0.705057]';
cam_dir      = [-0.836137, -0.272472, 0.476061]';
cam_up       = [-0.214821, 0.961235, 0.172857]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [0.671258, -0.0562119, 1.1468]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;