cam_pos      = [0.242186, 0.886616, 0.399741]';
cam_dir      = [0.823589, 0.416329, 0.38519]';
cam_up       = [-0.566508, 0.570582, 0.594563]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [-0.0369096, 0.941492, -0.938686]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;