函式說明：

UF_MODL_create_offset_region (view source) 

使用程式碼例項：

        int face_count;
	UF_MODL_ask_list_count(faces_pt, &face_count);

	tag_t * seed_faces = new tag_t[face_count-2];

	//選出要offset的面
	int j=0;
	for (int i=0; i<face_count; ++i)
	{
		tag_t i_face;
		UF_MODL_ask_list_item(faces_pt, i, &i_face);
		double i_face_dir[3];
		UF_MODL_ask_face_data(i_face,&tmp_face_type,point,i_face_dir,box,&radius,&rad_data,&norm_dir);
		int i_face_type;
		UF_MODL_ask_face_type(i_face, &i_face_type);
		double ang = angleBetween2Directions(i_face_dir, face_dir);
		bool is_face_extruded_from_convex_edge = false;
		for (auto k_edge : convex_adj_edges_vec)
		{
			if (MHY_ask_is_edge_on_face(k_edge, i_face))
			{
				is_face_extruded_from_convex_edge = true;
				break;
			}
		}
		if ( !((ang<1 || ang>179) && i_face_type == UF_MODL_PLANAR_FACE)  //排除拉伸體的上下底面
			&&   !is_face_extruded_from_convex_edge) //排除凸邊相鄰的面
		{
			seed_faces[j] = i_face;
			++j;
		}
	}

	UF_MODL_dfo_region_t region_t;
	region_t.seed_faces = seed_faces;
	region_t.num_seed = j;
	region_t.boundary_faces = nullptr;
	region_t.num_boundary = 0;
	region_t.excluded_faces = nullptr;
	region_t.num_exclude = 0;

	char offset_value_str[100];
	sprintf_s(offset_value_str, "%.2f", offset_dis);
	tag_t offset_feature;
	UF_CALL(UF_MODL_create_offset_region(&region_t, offset_value_str, &offset_feature));

最終效果：