976 lines
31 KiB
C
976 lines
31 KiB
C
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/* ADMesh -- process triangulated solid meshes
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* Copyright (C) 1995, 1996 Anthony D. Martin <amartin@engr.csulb.edu>
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* Copyright (C) 2013, 2014 several contributors, see AUTHORS
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Questions, comments, suggestions, etc to
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* https://github.com/admesh/admesh/issues
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <math.h>
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#include "stl.h"
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static void stl_match_neighbors_exact(stl_file *stl,
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stl_hash_edge *edge_a, stl_hash_edge *edge_b);
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static void stl_match_neighbors_nearby(stl_file *stl,
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stl_hash_edge *edge_a, stl_hash_edge *edge_b);
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static void stl_record_neighbors(stl_file *stl,
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stl_hash_edge *edge_a, stl_hash_edge *edge_b);
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static void stl_initialize_facet_check_exact(stl_file *stl);
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static void stl_initialize_facet_check_nearby(stl_file *stl);
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static void stl_load_edge_exact(stl_file *stl, stl_hash_edge *edge,
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stl_vertex *a, stl_vertex *b);
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static int stl_load_edge_nearby(stl_file *stl, stl_hash_edge *edge,
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stl_vertex *a, stl_vertex *b, float tolerance);
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static void insert_hash_edge(stl_file *stl, stl_hash_edge edge,
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void (*match_neighbors)(stl_file *stl,
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stl_hash_edge *edge_a, stl_hash_edge *edge_b));
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static int stl_get_hash_for_edge(int M, stl_hash_edge *edge);
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static int stl_compare_function(stl_hash_edge *edge_a, stl_hash_edge *edge_b);
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static void stl_free_edges(stl_file *stl);
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static void stl_remove_facet(stl_file *stl, int facet_number);
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static void stl_change_vertices(stl_file *stl, int facet_num, int vnot,
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stl_vertex new_vertex);
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static void stl_which_vertices_to_change(stl_file *stl, stl_hash_edge *edge_a,
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stl_hash_edge *edge_b, int *facet1, int *vertex1,
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int *facet2, int *vertex2,
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stl_vertex *new_vertex1, stl_vertex *new_vertex2);
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static void stl_remove_degenerate(stl_file *stl, int facet);
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extern int stl_check_normal_vector(stl_file *stl,
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int facet_num, int normal_fix_flag);
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static void stl_update_connects_remove_1(stl_file *stl, int facet_num);
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void
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stl_check_facets_exact(stl_file *stl) {
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/* This function builds the neighbors list. No modifications are made
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* to any of the facets. The edges are said to match only if all six
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* floats of the first edge matches all six floats of the second edge.
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*/
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stl_hash_edge edge;
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stl_facet facet;
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int i;
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int j;
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if (stl->error) return;
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stl->stats.connected_edges = 0;
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stl->stats.connected_facets_1_edge = 0;
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stl->stats.connected_facets_2_edge = 0;
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stl->stats.connected_facets_3_edge = 0;
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stl_initialize_facet_check_exact(stl);
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for(i = 0; i < stl->stats.number_of_facets; i++) {
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facet = stl->facet_start[i];
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/* If any two of the three vertices are found to be exactally the same, call them degenerate and remove the facet. */
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if( !memcmp(&facet.vertex[0], &facet.vertex[1],
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sizeof(stl_vertex))
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|| !memcmp(&facet.vertex[1], &facet.vertex[2],
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sizeof(stl_vertex))
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|| !memcmp(&facet.vertex[0], &facet.vertex[2],
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sizeof(stl_vertex))) {
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stl->stats.degenerate_facets += 1;
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stl_remove_facet(stl, i);
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i--;
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continue;
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}
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for(j = 0; j < 3; j++) {
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edge.facet_number = i;
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edge.which_edge = j;
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stl_load_edge_exact(stl, &edge, &facet.vertex[j],
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&facet.vertex[(j + 1) % 3]);
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insert_hash_edge(stl, edge, stl_match_neighbors_exact);
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}
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}
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stl_free_edges(stl);
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}
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static void
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stl_load_edge_exact(stl_file *stl, stl_hash_edge *edge,
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stl_vertex *a, stl_vertex *b) {
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float diff_x;
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float diff_y;
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float diff_z;
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float max_diff;
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if (stl->error) return;
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diff_x = ABS(a->x - b->x);
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diff_y = ABS(a->y - b->y);
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diff_z = ABS(a->z - b->z);
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max_diff = STL_MAX(diff_x, diff_y);
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max_diff = STL_MAX(diff_z, max_diff);
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stl->stats.shortest_edge = STL_MIN(max_diff, stl->stats.shortest_edge);
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if(diff_x == max_diff) {
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if(a->x > b->x) {
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memcpy(&edge->key[0], a, sizeof(stl_vertex));
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memcpy(&edge->key[3], b, sizeof(stl_vertex));
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} else {
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memcpy(&edge->key[0], b, sizeof(stl_vertex));
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memcpy(&edge->key[3], a, sizeof(stl_vertex));
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edge->which_edge += 3; /* this edge is loaded backwards */
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}
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} else if(diff_y == max_diff) {
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if(a->y > b->y) {
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memcpy(&edge->key[0], a, sizeof(stl_vertex));
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memcpy(&edge->key[3], b, sizeof(stl_vertex));
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} else {
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memcpy(&edge->key[0], b, sizeof(stl_vertex));
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memcpy(&edge->key[3], a, sizeof(stl_vertex));
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edge->which_edge += 3; /* this edge is loaded backwards */
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}
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} else {
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if(a->z > b->z) {
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memcpy(&edge->key[0], a, sizeof(stl_vertex));
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memcpy(&edge->key[3], b, sizeof(stl_vertex));
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} else {
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memcpy(&edge->key[0], b, sizeof(stl_vertex));
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memcpy(&edge->key[3], a, sizeof(stl_vertex));
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edge->which_edge += 3; /* this edge is loaded backwards */
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}
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}
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}
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static void
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stl_initialize_facet_check_exact(stl_file *stl) {
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int i;
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if (stl->error) return;
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stl->stats.malloced = 0;
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stl->stats.freed = 0;
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stl->stats.collisions = 0;
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stl->M = 81397;
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for(i = 0; i < stl->stats.number_of_facets ; i++) {
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/* initialize neighbors list to -1 to mark unconnected edges */
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stl->neighbors_start[i].neighbor[0] = -1;
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stl->neighbors_start[i].neighbor[1] = -1;
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stl->neighbors_start[i].neighbor[2] = -1;
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}
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stl->heads = (stl_hash_edge**)calloc(stl->M, sizeof(*stl->heads));
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if(stl->heads == NULL) perror("stl_initialize_facet_check_exact");
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stl->tail = (stl_hash_edge*)malloc(sizeof(stl_hash_edge));
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if(stl->tail == NULL) perror("stl_initialize_facet_check_exact");
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stl->tail->next = stl->tail;
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for(i = 0; i < stl->M; i++) {
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stl->heads[i] = stl->tail;
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}
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}
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static void
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insert_hash_edge(stl_file *stl, stl_hash_edge edge,
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void (*match_neighbors)(stl_file *stl,
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stl_hash_edge *edge_a, stl_hash_edge *edge_b)) {
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stl_hash_edge *link;
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stl_hash_edge *new_edge;
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stl_hash_edge *temp;
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int chain_number;
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if (stl->error) return;
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chain_number = stl_get_hash_for_edge(stl->M, &edge);
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link = stl->heads[chain_number];
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if(link == stl->tail) {
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/* This list doesn't have any edges currently in it. Add this one. */
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new_edge = (stl_hash_edge*)malloc(sizeof(stl_hash_edge));
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if(new_edge == NULL) perror("insert_hash_edge");
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stl->stats.malloced++;
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*new_edge = edge;
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new_edge->next = stl->tail;
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stl->heads[chain_number] = new_edge;
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return;
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} else if(!stl_compare_function(&edge, link)) {
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/* This is a match. Record result in neighbors list. */
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match_neighbors(stl, &edge, link);
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/* Delete the matched edge from the list. */
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stl->heads[chain_number] = link->next;
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free(link);
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stl->stats.freed++;
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return;
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} else {
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/* Continue through the rest of the list */
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for(;;) {
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if(link->next == stl->tail) {
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/* This is the last item in the list. Insert a new edge. */
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new_edge = (stl_hash_edge*)malloc(sizeof(stl_hash_edge));
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if(new_edge == NULL) perror("insert_hash_edge");
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stl->stats.malloced++;
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*new_edge = edge;
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new_edge->next = stl->tail;
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link->next = new_edge;
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stl->stats.collisions++;
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return;
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} else if(!stl_compare_function(&edge, link->next)) {
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/* This is a match. Record result in neighbors list. */
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match_neighbors(stl, &edge, link->next);
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/* Delete the matched edge from the list. */
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temp = link->next;
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link->next = link->next->next;
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free(temp);
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stl->stats.freed++;
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return;
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} else {
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/* This is not a match. Go to the next link */
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link = link->next;
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stl->stats.collisions++;
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}
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}
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}
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}
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static int
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stl_get_hash_for_edge(int M, stl_hash_edge *edge) {
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return ((edge->key[0] / 23 + edge->key[1] / 19 + edge->key[2] / 17
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+ edge->key[3] /13 + edge->key[4] / 11 + edge->key[5] / 7 ) % M);
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}
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static int
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stl_compare_function(stl_hash_edge *edge_a, stl_hash_edge *edge_b) {
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if(edge_a->facet_number == edge_b->facet_number) {
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return 1; /* Don't match edges of the same facet */
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} else {
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return memcmp(edge_a, edge_b, SIZEOF_EDGE_SORT);
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}
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}
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void
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stl_check_facets_nearby(stl_file *stl, float tolerance) {
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stl_hash_edge edge[3];
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stl_facet facet;
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int i;
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int j;
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if (stl->error) return;
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if( (stl->stats.connected_facets_1_edge == stl->stats.number_of_facets)
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&& (stl->stats.connected_facets_2_edge == stl->stats.number_of_facets)
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&& (stl->stats.connected_facets_3_edge == stl->stats.number_of_facets)) {
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/* No need to check any further. All facets are connected */
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return;
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}
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stl_initialize_facet_check_nearby(stl);
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for(i = 0; i < stl->stats.number_of_facets; i++) {
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facet = stl->facet_start[i];
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for(j = 0; j < 3; j++) {
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if(stl->neighbors_start[i].neighbor[j] == -1) {
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edge[j].facet_number = i;
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edge[j].which_edge = j;
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if(stl_load_edge_nearby(stl, &edge[j], &facet.vertex[j],
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&facet.vertex[(j + 1) % 3],
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tolerance)) {
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/* only insert edges that have different keys */
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insert_hash_edge(stl, edge[j], stl_match_neighbors_nearby);
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}
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}
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}
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}
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stl_free_edges(stl);
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}
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static int
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stl_load_edge_nearby(stl_file *stl, stl_hash_edge *edge,
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stl_vertex *a, stl_vertex *b, float tolerance) {
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float diff_x;
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float diff_y;
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float diff_z;
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float max_diff;
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unsigned vertex1[3];
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unsigned vertex2[3];
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diff_x = ABS(a->x - b->x);
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diff_y = ABS(a->y - b->y);
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diff_z = ABS(a->z - b->z);
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max_diff = STL_MAX(diff_x, diff_y);
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max_diff = STL_MAX(diff_z, max_diff);
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vertex1[0] = (unsigned)((a->x - stl->stats.min.x) / tolerance);
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vertex1[1] = (unsigned)((a->y - stl->stats.min.y) / tolerance);
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vertex1[2] = (unsigned)((a->z - stl->stats.min.z) / tolerance);
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vertex2[0] = (unsigned)((b->x - stl->stats.min.x) / tolerance);
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vertex2[1] = (unsigned)((b->y - stl->stats.min.y) / tolerance);
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vertex2[2] = (unsigned)((b->z - stl->stats.min.z) / tolerance);
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if( (vertex1[0] == vertex2[0])
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&& (vertex1[1] == vertex2[1])
|
||
|
|
&& (vertex1[2] == vertex2[2])) {
|
||
|
|
/* Both vertices hash to the same value */
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
if(diff_x == max_diff) {
|
||
|
|
if(a->x > b->x) {
|
||
|
|
memcpy(&edge->key[0], vertex1, sizeof(stl_vertex));
|
||
|
|
memcpy(&edge->key[3], vertex2, sizeof(stl_vertex));
|
||
|
|
} else {
|
||
|
|
memcpy(&edge->key[0], vertex2, sizeof(stl_vertex));
|
||
|
|
memcpy(&edge->key[3], vertex1, sizeof(stl_vertex));
|
||
|
|
edge->which_edge += 3; /* this edge is loaded backwards */
|
||
|
|
}
|
||
|
|
} else if(diff_y == max_diff) {
|
||
|
|
if(a->y > b->y) {
|
||
|
|
memcpy(&edge->key[0], vertex1, sizeof(stl_vertex));
|
||
|
|
memcpy(&edge->key[3], vertex2, sizeof(stl_vertex));
|
||
|
|
} else {
|
||
|
|
memcpy(&edge->key[0], vertex2, sizeof(stl_vertex));
|
||
|
|
memcpy(&edge->key[3], vertex1, sizeof(stl_vertex));
|
||
|
|
edge->which_edge += 3; /* this edge is loaded backwards */
|
||
|
|
}
|
||
|
|
} else {
|
||
|
|
if(a->z > b->z) {
|
||
|
|
memcpy(&edge->key[0], vertex1, sizeof(stl_vertex));
|
||
|
|
memcpy(&edge->key[3], vertex2, sizeof(stl_vertex));
|
||
|
|
} else {
|
||
|
|
memcpy(&edge->key[0], vertex2, sizeof(stl_vertex));
|
||
|
|
memcpy(&edge->key[3], vertex1, sizeof(stl_vertex));
|
||
|
|
edge->which_edge += 3; /* this edge is loaded backwards */
|
||
|
|
}
|
||
|
|
}
|
||
|
|
return 1;
|
||
|
|
}
|
||
|
|
|
||
|
|
static void
|
||
|
|
stl_free_edges(stl_file *stl) {
|
||
|
|
int i;
|
||
|
|
stl_hash_edge *temp;
|
||
|
|
|
||
|
|
if (stl->error) return;
|
||
|
|
|
||
|
|
if(stl->stats.malloced != stl->stats.freed) {
|
||
|
|
for(i = 0; i < stl->M; i++) {
|
||
|
|
for(temp = stl->heads[i]; stl->heads[i] != stl->tail;
|
||
|
|
temp = stl->heads[i]) {
|
||
|
|
stl->heads[i] = stl->heads[i]->next;
|
||
|
|
free(temp);
|
||
|
|
stl->stats.freed++;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
free(stl->heads);
|
||
|
|
free(stl->tail);
|
||
|
|
}
|
||
|
|
|
||
|
|
static void
|
||
|
|
stl_initialize_facet_check_nearby(stl_file *stl) {
|
||
|
|
int i;
|
||
|
|
|
||
|
|
if (stl->error) return;
|
||
|
|
|
||
|
|
stl->stats.malloced = 0;
|
||
|
|
stl->stats.freed = 0;
|
||
|
|
stl->stats.collisions = 0;
|
||
|
|
|
||
|
|
/* tolerance = STL_MAX(stl->stats.shortest_edge, tolerance);*/
|
||
|
|
/* tolerance = STL_MAX((stl->stats.bounding_diameter / 500000.0), tolerance);*/
|
||
|
|
/* tolerance *= 0.5;*/
|
||
|
|
|
||
|
|
stl->M = 81397;
|
||
|
|
|
||
|
|
stl->heads = (stl_hash_edge**)calloc(stl->M, sizeof(*stl->heads));
|
||
|
|
if(stl->heads == NULL) perror("stl_initialize_facet_check_nearby");
|
||
|
|
|
||
|
|
stl->tail = (stl_hash_edge*)malloc(sizeof(stl_hash_edge));
|
||
|
|
if(stl->tail == NULL) perror("stl_initialize_facet_check_nearby");
|
||
|
|
|
||
|
|
stl->tail->next = stl->tail;
|
||
|
|
|
||
|
|
for(i = 0; i < stl->M; i++) {
|
||
|
|
stl->heads[i] = stl->tail;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
static void
|
||
|
|
stl_record_neighbors(stl_file *stl,
|
||
|
|
stl_hash_edge *edge_a, stl_hash_edge *edge_b) {
|
||
|
|
int i;
|
||
|
|
int j;
|
||
|
|
|
||
|
|
if (stl->error) return;
|
||
|
|
|
||
|
|
/* Facet a's neighbor is facet b */
|
||
|
|
stl->neighbors_start[edge_a->facet_number].neighbor[edge_a->which_edge % 3] =
|
||
|
|
edge_b->facet_number; /* sets the .neighbor part */
|
||
|
|
|
||
|
|
stl->neighbors_start[edge_a->facet_number].
|
||
|
|
which_vertex_not[edge_a->which_edge % 3] =
|
||
|
|
(edge_b->which_edge + 2) % 3; /* sets the .which_vertex_not part */
|
||
|
|
|
||
|
|
/* Facet b's neighbor is facet a */
|
||
|
|
stl->neighbors_start[edge_b->facet_number].neighbor[edge_b->which_edge % 3] =
|
||
|
|
edge_a->facet_number; /* sets the .neighbor part */
|
||
|
|
|
||
|
|
stl->neighbors_start[edge_b->facet_number].
|
||
|
|
which_vertex_not[edge_b->which_edge % 3] =
|
||
|
|
(edge_a->which_edge + 2) % 3; /* sets the .which_vertex_not part */
|
||
|
|
|
||
|
|
if( ((edge_a->which_edge < 3) && (edge_b->which_edge < 3))
|
||
|
|
|| ((edge_a->which_edge > 2) && (edge_b->which_edge > 2))) {
|
||
|
|
/* these facets are oriented in opposite directions. */
|
||
|
|
/* their normals are probably messed up. */
|
||
|
|
stl->neighbors_start[edge_a->facet_number].
|
||
|
|
which_vertex_not[edge_a->which_edge % 3] += 3;
|
||
|
|
stl->neighbors_start[edge_b->facet_number].
|
||
|
|
which_vertex_not[edge_b->which_edge % 3] += 3;
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
/* Count successful connects */
|
||
|
|
/* Total connects */
|
||
|
|
stl->stats.connected_edges += 2;
|
||
|
|
/* Count individual connects */
|
||
|
|
i = ((stl->neighbors_start[edge_a->facet_number].neighbor[0] == -1) +
|
||
|
|
(stl->neighbors_start[edge_a->facet_number].neighbor[1] == -1) +
|
||
|
|
(stl->neighbors_start[edge_a->facet_number].neighbor[2] == -1));
|
||
|
|
j = ((stl->neighbors_start[edge_b->facet_number].neighbor[0] == -1) +
|
||
|
|
(stl->neighbors_start[edge_b->facet_number].neighbor[1] == -1) +
|
||
|
|
(stl->neighbors_start[edge_b->facet_number].neighbor[2] == -1));
|
||
|
|
if(i == 2) {
|
||
|
|
stl->stats.connected_facets_1_edge +=1;
|
||
|
|
} else if(i == 1) {
|
||
|
|
stl->stats.connected_facets_2_edge +=1;
|
||
|
|
} else {
|
||
|
|
stl->stats.connected_facets_3_edge +=1;
|
||
|
|
}
|
||
|
|
if(j == 2) {
|
||
|
|
stl->stats.connected_facets_1_edge +=1;
|
||
|
|
} else if(j == 1) {
|
||
|
|
stl->stats.connected_facets_2_edge +=1;
|
||
|
|
} else {
|
||
|
|
stl->stats.connected_facets_3_edge +=1;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
static void
|
||
|
|
stl_match_neighbors_exact(stl_file *stl,
|
||
|
|
stl_hash_edge *edge_a, stl_hash_edge *edge_b) {
|
||
|
|
if (stl->error) return;
|
||
|
|
stl_record_neighbors(stl, edge_a, edge_b);
|
||
|
|
}
|
||
|
|
|
||
|
|
static void
|
||
|
|
stl_match_neighbors_nearby(stl_file *stl,
|
||
|
|
stl_hash_edge *edge_a, stl_hash_edge *edge_b) {
|
||
|
|
int facet1;
|
||
|
|
int facet2;
|
||
|
|
int vertex1;
|
||
|
|
int vertex2;
|
||
|
|
int vnot1;
|
||
|
|
int vnot2;
|
||
|
|
stl_vertex new_vertex1;
|
||
|
|
stl_vertex new_vertex2;
|
||
|
|
|
||
|
|
if (stl->error) return;
|
||
|
|
|
||
|
|
stl_record_neighbors(stl, edge_a, edge_b);
|
||
|
|
stl_which_vertices_to_change(stl, edge_a, edge_b, &facet1, &vertex1,
|
||
|
|
&facet2, &vertex2, &new_vertex1, &new_vertex2);
|
||
|
|
if(facet1 != -1) {
|
||
|
|
if(facet1 == edge_a->facet_number) {
|
||
|
|
vnot1 = (edge_a->which_edge + 2) % 3;
|
||
|
|
} else {
|
||
|
|
vnot1 = (edge_b->which_edge + 2) % 3;
|
||
|
|
}
|
||
|
|
if(((vnot1 + 2) % 3) == vertex1) {
|
||
|
|
vnot1 += 3;
|
||
|
|
}
|
||
|
|
stl_change_vertices(stl, facet1, vnot1, new_vertex1);
|
||
|
|
}
|
||
|
|
if(facet2 != -1) {
|
||
|
|
if(facet2 == edge_a->facet_number) {
|
||
|
|
vnot2 = (edge_a->which_edge + 2) % 3;
|
||
|
|
} else {
|
||
|
|
vnot2 = (edge_b->which_edge + 2) % 3;
|
||
|
|
}
|
||
|
|
if(((vnot2 + 2) % 3) == vertex2) {
|
||
|
|
vnot2 += 3;
|
||
|
|
}
|
||
|
|
stl_change_vertices(stl, facet2, vnot2, new_vertex2);
|
||
|
|
}
|
||
|
|
stl->stats.edges_fixed += 2;
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
static void
|
||
|
|
stl_change_vertices(stl_file *stl, int facet_num, int vnot,
|
||
|
|
stl_vertex new_vertex) {
|
||
|
|
int first_facet;
|
||
|
|
int direction;
|
||
|
|
int next_edge;
|
||
|
|
int pivot_vertex;
|
||
|
|
|
||
|
|
if (stl->error) return;
|
||
|
|
|
||
|
|
first_facet = facet_num;
|
||
|
|
direction = 0;
|
||
|
|
|
||
|
|
for(;;) {
|
||
|
|
if(vnot > 2) {
|
||
|
|
if(direction == 0) {
|
||
|
|
pivot_vertex = (vnot + 2) % 3;
|
||
|
|
next_edge = pivot_vertex;
|
||
|
|
direction = 1;
|
||
|
|
} else {
|
||
|
|
pivot_vertex = (vnot + 1) % 3;
|
||
|
|
next_edge = vnot % 3;
|
||
|
|
direction = 0;
|
||
|
|
}
|
||
|
|
} else {
|
||
|
|
if(direction == 0) {
|
||
|
|
pivot_vertex = (vnot + 1) % 3;
|
||
|
|
next_edge = vnot;
|
||
|
|
} else {
|
||
|
|
pivot_vertex = (vnot + 2) % 3;
|
||
|
|
next_edge = pivot_vertex;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
stl->facet_start[facet_num].vertex[pivot_vertex] = new_vertex;
|
||
|
|
vnot = stl->neighbors_start[facet_num].which_vertex_not[next_edge];
|
||
|
|
facet_num = stl->neighbors_start[facet_num].neighbor[next_edge];
|
||
|
|
|
||
|
|
if(facet_num == -1) {
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
|
||
|
|
if(facet_num == first_facet) {
|
||
|
|
/* back to the beginning */
|
||
|
|
printf("\
|
||
|
|
Back to the first facet changing vertices: probably a mobius part.\n\
|
||
|
|
Try using a smaller tolerance or don't do a nearby check\n");
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
static void
|
||
|
|
stl_which_vertices_to_change(stl_file *stl, stl_hash_edge *edge_a,
|
||
|
|
stl_hash_edge *edge_b, int *facet1, int *vertex1,
|
||
|
|
int *facet2, int *vertex2,
|
||
|
|
stl_vertex *new_vertex1, stl_vertex *new_vertex2) {
|
||
|
|
int v1a; /* pair 1, facet a */
|
||
|
|
int v1b; /* pair 1, facet b */
|
||
|
|
int v2a; /* pair 2, facet a */
|
||
|
|
int v2b; /* pair 2, facet b */
|
||
|
|
|
||
|
|
/* Find first pair */
|
||
|
|
if(edge_a->which_edge < 3) {
|
||
|
|
v1a = edge_a->which_edge;
|
||
|
|
v2a = (edge_a->which_edge + 1) % 3;
|
||
|
|
} else {
|
||
|
|
v2a = edge_a->which_edge % 3;
|
||
|
|
v1a = (edge_a->which_edge + 1) % 3;
|
||
|
|
}
|
||
|
|
if(edge_b->which_edge < 3) {
|
||
|
|
v1b = edge_b->which_edge;
|
||
|
|
v2b = (edge_b->which_edge + 1) % 3;
|
||
|
|
} else {
|
||
|
|
v2b = edge_b->which_edge % 3;
|
||
|
|
v1b = (edge_b->which_edge + 1) % 3;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Of the first pair, which vertex, if any, should be changed */
|
||
|
|
if(!memcmp(&stl->facet_start[edge_a->facet_number].vertex[v1a],
|
||
|
|
&stl->facet_start[edge_b->facet_number].vertex[v1b],
|
||
|
|
sizeof(stl_vertex))) {
|
||
|
|
/* These facets are already equal. No need to change. */
|
||
|
|
*facet1 = -1;
|
||
|
|
} else {
|
||
|
|
if( (stl->neighbors_start[edge_a->facet_number].neighbor[v1a] == -1)
|
||
|
|
&& (stl->neighbors_start[edge_a->facet_number].
|
||
|
|
neighbor[(v1a + 2) % 3] == -1)) {
|
||
|
|
/* This vertex has no neighbors. This is a good one to change */
|
||
|
|
*facet1 = edge_a->facet_number;
|
||
|
|
*vertex1 = v1a;
|
||
|
|
*new_vertex1 = stl->facet_start[edge_b->facet_number].vertex[v1b];
|
||
|
|
} else {
|
||
|
|
*facet1 = edge_b->facet_number;
|
||
|
|
*vertex1 = v1b;
|
||
|
|
*new_vertex1 = stl->facet_start[edge_a->facet_number].vertex[v1a];
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Of the second pair, which vertex, if any, should be changed */
|
||
|
|
if(!memcmp(&stl->facet_start[edge_a->facet_number].vertex[v2a],
|
||
|
|
&stl->facet_start[edge_b->facet_number].vertex[v2b],
|
||
|
|
sizeof(stl_vertex))) {
|
||
|
|
/* These facets are already equal. No need to change. */
|
||
|
|
*facet2 = -1;
|
||
|
|
} else {
|
||
|
|
if( (stl->neighbors_start[edge_a->facet_number].neighbor[v2a] == -1)
|
||
|
|
&& (stl->neighbors_start[edge_a->facet_number].
|
||
|
|
neighbor[(v2a + 2) % 3] == -1)) {
|
||
|
|
/* This vertex has no neighbors. This is a good one to change */
|
||
|
|
*facet2 = edge_a->facet_number;
|
||
|
|
*vertex2 = v2a;
|
||
|
|
*new_vertex2 = stl->facet_start[edge_b->facet_number].vertex[v2b];
|
||
|
|
} else {
|
||
|
|
*facet2 = edge_b->facet_number;
|
||
|
|
*vertex2 = v2b;
|
||
|
|
*new_vertex2 = stl->facet_start[edge_a->facet_number].vertex[v2a];
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
static void
|
||
|
|
stl_remove_facet(stl_file *stl, int facet_number) {
|
||
|
|
int neighbor[3];
|
||
|
|
int vnot[3];
|
||
|
|
int i;
|
||
|
|
int j;
|
||
|
|
|
||
|
|
if (stl->error) return;
|
||
|
|
|
||
|
|
stl->stats.facets_removed += 1;
|
||
|
|
/* Update list of connected edges */
|
||
|
|
j = ((stl->neighbors_start[facet_number].neighbor[0] == -1) +
|
||
|
|
(stl->neighbors_start[facet_number].neighbor[1] == -1) +
|
||
|
|
(stl->neighbors_start[facet_number].neighbor[2] == -1));
|
||
|
|
if(j == 2) {
|
||
|
|
stl->stats.connected_facets_1_edge -= 1;
|
||
|
|
} else if(j == 1) {
|
||
|
|
stl->stats.connected_facets_2_edge -= 1;
|
||
|
|
stl->stats.connected_facets_1_edge -= 1;
|
||
|
|
} else if(j == 0) {
|
||
|
|
stl->stats.connected_facets_3_edge -= 1;
|
||
|
|
stl->stats.connected_facets_2_edge -= 1;
|
||
|
|
stl->stats.connected_facets_1_edge -= 1;
|
||
|
|
}
|
||
|
|
|
||
|
|
stl->facet_start[facet_number] =
|
||
|
|
stl->facet_start[stl->stats.number_of_facets - 1];
|
||
|
|
/* I could reallocate at this point, but it is not really necessary. */
|
||
|
|
stl->neighbors_start[facet_number] =
|
||
|
|
stl->neighbors_start[stl->stats.number_of_facets - 1];
|
||
|
|
stl->stats.number_of_facets -= 1;
|
||
|
|
|
||
|
|
for(i = 0; i < 3; i++) {
|
||
|
|
neighbor[i] = stl->neighbors_start[facet_number].neighbor[i];
|
||
|
|
vnot[i] = stl->neighbors_start[facet_number].which_vertex_not[i];
|
||
|
|
}
|
||
|
|
|
||
|
|
for(i = 0; i < 3; i++) {
|
||
|
|
if(neighbor[i] != -1) {
|
||
|
|
if(stl->neighbors_start[neighbor[i]].neighbor[(vnot[i] + 1)% 3] !=
|
||
|
|
stl->stats.number_of_facets) {
|
||
|
|
printf("\
|
||
|
|
in stl_remove_facet: neighbor = %d numfacets = %d this is wrong\n",
|
||
|
|
stl->neighbors_start[neighbor[i]].neighbor[(vnot[i] + 1)% 3],
|
||
|
|
stl->stats.number_of_facets);
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
stl->neighbors_start[neighbor[i]].neighbor[(vnot[i] + 1)% 3]
|
||
|
|
= facet_number;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
void
|
||
|
|
stl_remove_unconnected_facets(stl_file *stl) {
|
||
|
|
/* A couple of things need to be done here. One is to remove any */
|
||
|
|
/* completely unconnected facets (0 edges connected) since these are */
|
||
|
|
/* useless and could be completely wrong. The second thing that needs to */
|
||
|
|
/* be done is to remove any degenerate facets that were created during */
|
||
|
|
/* stl_check_facets_nearby(). */
|
||
|
|
|
||
|
|
int i;
|
||
|
|
|
||
|
|
if (stl->error) return;
|
||
|
|
|
||
|
|
/* remove degenerate facets */
|
||
|
|
for(i = 0; i < stl->stats.number_of_facets; i++) {
|
||
|
|
if( !memcmp(&stl->facet_start[i].vertex[0],
|
||
|
|
&stl->facet_start[i].vertex[1], sizeof(stl_vertex))
|
||
|
|
|| !memcmp(&stl->facet_start[i].vertex[1],
|
||
|
|
&stl->facet_start[i].vertex[2], sizeof(stl_vertex))
|
||
|
|
|| !memcmp(&stl->facet_start[i].vertex[0],
|
||
|
|
&stl->facet_start[i].vertex[2], sizeof(stl_vertex))) {
|
||
|
|
stl_remove_degenerate(stl, i);
|
||
|
|
i--;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
if(stl->stats.connected_facets_1_edge < stl->stats.number_of_facets) {
|
||
|
|
/* remove completely unconnected facets */
|
||
|
|
for(i = 0; i < stl->stats.number_of_facets; i++) {
|
||
|
|
if( (stl->neighbors_start[i].neighbor[0] == -1)
|
||
|
|
&& (stl->neighbors_start[i].neighbor[1] == -1)
|
||
|
|
&& (stl->neighbors_start[i].neighbor[2] == -1)) {
|
||
|
|
/* This facet is completely unconnected. Remove it. */
|
||
|
|
stl_remove_facet(stl, i);
|
||
|
|
i--;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
static void
|
||
|
|
stl_remove_degenerate(stl_file *stl, int facet) {
|
||
|
|
int edge1;
|
||
|
|
int edge2;
|
||
|
|
int edge3;
|
||
|
|
int neighbor1;
|
||
|
|
int neighbor2;
|
||
|
|
int neighbor3;
|
||
|
|
int vnot1;
|
||
|
|
int vnot2;
|
||
|
|
int vnot3;
|
||
|
|
|
||
|
|
if (stl->error) return;
|
||
|
|
|
||
|
|
if( !memcmp(&stl->facet_start[facet].vertex[0],
|
||
|
|
&stl->facet_start[facet].vertex[1], sizeof(stl_vertex))
|
||
|
|
&& !memcmp(&stl->facet_start[facet].vertex[1],
|
||
|
|
&stl->facet_start[facet].vertex[2], sizeof(stl_vertex))) {
|
||
|
|
/* all 3 vertices are equal. Just remove the facet. I don't think*/
|
||
|
|
/* this is really possible, but just in case... */
|
||
|
|
printf("removing a facet in stl_remove_degenerate\n");
|
||
|
|
|
||
|
|
stl_remove_facet(stl, facet);
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
|
||
|
|
if(!memcmp(&stl->facet_start[facet].vertex[0],
|
||
|
|
&stl->facet_start[facet].vertex[1], sizeof(stl_vertex))) {
|
||
|
|
edge1 = 1;
|
||
|
|
edge2 = 2;
|
||
|
|
edge3 = 0;
|
||
|
|
} else if(!memcmp(&stl->facet_start[facet].vertex[1],
|
||
|
|
&stl->facet_start[facet].vertex[2], sizeof(stl_vertex))) {
|
||
|
|
edge1 = 0;
|
||
|
|
edge2 = 2;
|
||
|
|
edge3 = 1;
|
||
|
|
} else if(!memcmp(&stl->facet_start[facet].vertex[2],
|
||
|
|
&stl->facet_start[facet].vertex[0], sizeof(stl_vertex))) {
|
||
|
|
edge1 = 0;
|
||
|
|
edge2 = 1;
|
||
|
|
edge3 = 2;
|
||
|
|
} else {
|
||
|
|
/* No degenerate. Function shouldn't have been called. */
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
neighbor1 = stl->neighbors_start[facet].neighbor[edge1];
|
||
|
|
neighbor2 = stl->neighbors_start[facet].neighbor[edge2];
|
||
|
|
|
||
|
|
if(neighbor1 == -1) {
|
||
|
|
stl_update_connects_remove_1(stl, neighbor2);
|
||
|
|
}
|
||
|
|
if(neighbor2 == -1) {
|
||
|
|
stl_update_connects_remove_1(stl, neighbor1);
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
neighbor3 = stl->neighbors_start[facet].neighbor[edge3];
|
||
|
|
vnot1 = stl->neighbors_start[facet].which_vertex_not[edge1];
|
||
|
|
vnot2 = stl->neighbors_start[facet].which_vertex_not[edge2];
|
||
|
|
vnot3 = stl->neighbors_start[facet].which_vertex_not[edge3];
|
||
|
|
|
||
|
|
if(neighbor1 != -1){
|
||
|
|
stl->neighbors_start[neighbor1].neighbor[(vnot1 + 1) % 3] = neighbor2;
|
||
|
|
stl->neighbors_start[neighbor1].which_vertex_not[(vnot1 + 1) % 3] = vnot2;
|
||
|
|
}
|
||
|
|
if(neighbor2 != -1){
|
||
|
|
stl->neighbors_start[neighbor2].neighbor[(vnot2 + 1) % 3] = neighbor1;
|
||
|
|
stl->neighbors_start[neighbor2].which_vertex_not[(vnot2 + 1) % 3] = vnot1;
|
||
|
|
}
|
||
|
|
|
||
|
|
stl_remove_facet(stl, facet);
|
||
|
|
|
||
|
|
if(neighbor3 != -1) {
|
||
|
|
stl_update_connects_remove_1(stl, neighbor3);
|
||
|
|
stl->neighbors_start[neighbor3].neighbor[(vnot3 + 1) % 3] = -1;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
void
|
||
|
|
stl_update_connects_remove_1(stl_file *stl, int facet_num) {
|
||
|
|
int j;
|
||
|
|
|
||
|
|
if (stl->error) return;
|
||
|
|
/* Update list of connected edges */
|
||
|
|
j = ((stl->neighbors_start[facet_num].neighbor[0] == -1) +
|
||
|
|
(stl->neighbors_start[facet_num].neighbor[1] == -1) +
|
||
|
|
(stl->neighbors_start[facet_num].neighbor[2] == -1));
|
||
|
|
if(j == 0) { /* Facet has 3 neighbors */
|
||
|
|
stl->stats.connected_facets_3_edge -= 1;
|
||
|
|
} else if(j == 1) { /* Facet has 2 neighbors */
|
||
|
|
stl->stats.connected_facets_2_edge -= 1;
|
||
|
|
} else if(j == 2) { /* Facet has 1 neighbor */
|
||
|
|
stl->stats.connected_facets_1_edge -= 1;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
void
|
||
|
|
stl_fill_holes(stl_file *stl) {
|
||
|
|
stl_facet facet;
|
||
|
|
stl_facet new_facet;
|
||
|
|
int neighbors_initial[3];
|
||
|
|
stl_hash_edge edge;
|
||
|
|
int first_facet;
|
||
|
|
int direction;
|
||
|
|
int facet_num;
|
||
|
|
int vnot;
|
||
|
|
int next_edge;
|
||
|
|
int pivot_vertex;
|
||
|
|
int next_facet;
|
||
|
|
int i;
|
||
|
|
int j;
|
||
|
|
int k;
|
||
|
|
|
||
|
|
if (stl->error) return;
|
||
|
|
|
||
|
|
/* Insert all unconnected edges into hash list */
|
||
|
|
stl_initialize_facet_check_nearby(stl);
|
||
|
|
for(i = 0; i < stl->stats.number_of_facets; i++) {
|
||
|
|
facet = stl->facet_start[i];
|
||
|
|
for(j = 0; j < 3; j++) {
|
||
|
|
if(stl->neighbors_start[i].neighbor[j] != -1) continue;
|
||
|
|
edge.facet_number = i;
|
||
|
|
edge.which_edge = j;
|
||
|
|
stl_load_edge_exact(stl, &edge, &facet.vertex[j],
|
||
|
|
&facet.vertex[(j + 1) % 3]);
|
||
|
|
|
||
|
|
insert_hash_edge(stl, edge, stl_match_neighbors_exact);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
for(i = 0; i < stl->stats.number_of_facets; i++) {
|
||
|
|
facet = stl->facet_start[i];
|
||
|
|
neighbors_initial[0] = stl->neighbors_start[i].neighbor[0];
|
||
|
|
neighbors_initial[1] = stl->neighbors_start[i].neighbor[1];
|
||
|
|
neighbors_initial[2] = stl->neighbors_start[i].neighbor[2];
|
||
|
|
first_facet = i;
|
||
|
|
for(j = 0; j < 3; j++) {
|
||
|
|
if(stl->neighbors_start[i].neighbor[j] != -1) continue;
|
||
|
|
|
||
|
|
new_facet.vertex[0] = facet.vertex[j];
|
||
|
|
new_facet.vertex[1] = facet.vertex[(j + 1) % 3];
|
||
|
|
if(neighbors_initial[(j + 2) % 3] == -1) {
|
||
|
|
direction = 1;
|
||
|
|
} else {
|
||
|
|
direction = 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
facet_num = i;
|
||
|
|
vnot = (j + 2) % 3;
|
||
|
|
|
||
|
|
for(;;) {
|
||
|
|
if(vnot > 2) {
|
||
|
|
if(direction == 0) {
|
||
|
|
pivot_vertex = (vnot + 2) % 3;
|
||
|
|
next_edge = pivot_vertex;
|
||
|
|
direction = 1;
|
||
|
|
} else {
|
||
|
|
pivot_vertex = (vnot + 1) % 3;
|
||
|
|
next_edge = vnot % 3;
|
||
|
|
direction = 0;
|
||
|
|
}
|
||
|
|
} else {
|
||
|
|
if(direction == 0) {
|
||
|
|
pivot_vertex = (vnot + 1) % 3;
|
||
|
|
next_edge = vnot;
|
||
|
|
} else {
|
||
|
|
pivot_vertex = (vnot + 2) % 3;
|
||
|
|
next_edge = pivot_vertex;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
next_facet = stl->neighbors_start[facet_num].neighbor[next_edge];
|
||
|
|
|
||
|
|
if(next_facet == -1) {
|
||
|
|
new_facet.vertex[2] = stl->facet_start[facet_num].
|
||
|
|
vertex[vnot % 3];
|
||
|
|
stl_add_facet(stl, &new_facet);
|
||
|
|
for(k = 0; k < 3; k++) {
|
||
|
|
edge.facet_number = stl->stats.number_of_facets - 1;
|
||
|
|
edge.which_edge = k;
|
||
|
|
stl_load_edge_exact(stl, &edge, &new_facet.vertex[k],
|
||
|
|
&new_facet.vertex[(k + 1) % 3]);
|
||
|
|
|
||
|
|
insert_hash_edge(stl, edge, stl_match_neighbors_exact);
|
||
|
|
}
|
||
|
|
break;
|
||
|
|
} else {
|
||
|
|
vnot = stl->neighbors_start[facet_num].
|
||
|
|
which_vertex_not[next_edge];
|
||
|
|
facet_num = next_facet;
|
||
|
|
}
|
||
|
|
|
||
|
|
if(facet_num == first_facet) {
|
||
|
|
/* back to the beginning */
|
||
|
|
printf("\
|
||
|
|
Back to the first facet filling holes: probably a mobius part.\n\
|
||
|
|
Try using a smaller tolerance or don't do a nearby check\n");
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
void
|
||
|
|
stl_add_facet(stl_file *stl, stl_facet *new_facet) {
|
||
|
|
if (stl->error) return;
|
||
|
|
|
||
|
|
stl->stats.facets_added += 1;
|
||
|
|
if(stl->stats.facets_malloced < stl->stats.number_of_facets + 1) {
|
||
|
|
stl->facet_start = (stl_facet*)realloc(stl->facet_start,
|
||
|
|
(sizeof(stl_facet) * (stl->stats.facets_malloced + 256)));
|
||
|
|
if(stl->facet_start == NULL) perror("stl_add_facet");
|
||
|
|
stl->neighbors_start = (stl_neighbors*)realloc(stl->neighbors_start,
|
||
|
|
(sizeof(stl_neighbors) * (stl->stats.facets_malloced + 256)));
|
||
|
|
if(stl->neighbors_start == NULL) perror("stl_add_facet");
|
||
|
|
stl->stats.facets_malloced += 256;
|
||
|
|
}
|
||
|
|
stl->facet_start[stl->stats.number_of_facets] = *new_facet;
|
||
|
|
|
||
|
|
/* note that the normal vector is not set here, just initialized to 0 */
|
||
|
|
stl->facet_start[stl->stats.number_of_facets].normal.x = 0.0;
|
||
|
|
stl->facet_start[stl->stats.number_of_facets].normal.y = 0.0;
|
||
|
|
stl->facet_start[stl->stats.number_of_facets].normal.z = 0.0;
|
||
|
|
|
||
|
|
stl->neighbors_start[stl->stats.number_of_facets].neighbor[0] = -1;
|
||
|
|
stl->neighbors_start[stl->stats.number_of_facets].neighbor[1] = -1;
|
||
|
|
stl->neighbors_start[stl->stats.number_of_facets].neighbor[2] = -1;
|
||
|
|
stl->stats.number_of_facets += 1;
|
||
|
|
}
|