cam_pos      = [0.178499, 1.35588, 1.18011]';
cam_dir      = [0.317727, -0.128825, -0.93939]';
cam_up       = [-0.5337, 0.794585, -0.289479]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [-1.04234, -0.789126, -0.244332]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;