cam_pos      = [-0.59794, 0.944037, 0.0191108]';
cam_dir      = [-0.128663, 0.168801, -0.977217]';
cam_up       = [0.991385, 0.0462823, -0.122533]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [-0.0326437, 1.30947, 0.230492]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;