cam_pos      = [0.402437, 1.93545, 0.399732]';
cam_dir      = [0.0971632, -0.200378, 0.974889]';
cam_up       = [-0.469457, 0.854482, 0.222419]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [1.1672, 0.637441, 0.0146892]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;