cam_pos      = [0.150362, 1.18987, -0.638023]';
cam_dir      = [-0.916124, -0.30653, 0.258371]';
cam_up       = [-0.294706, 0.95186, 0.0843208]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [0.361467, -0.00146957, 1.27994]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;