cam_pos      = [0.222302, 1.45417, 0.280857]';
cam_dir      = [-0.895617, -0.207061, 0.393695]';
cam_up       = [-0.266035, 0.958657, -0.101004]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [0.47415, 0.259612, 1.21519]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;