mightyscape-1.2/extensions/fablabchemnitz/papercraft_unfold/admesh/linux/src/shared.c

263 lines
7.7 KiB
C
Raw Normal View History

2022-11-05 15:17:35 +01:00
/* ADMesh -- process triangulated solid meshes
* Copyright (C) 1995, 1996 Anthony D. Martin <amartin@engr.csulb.edu>
* Copyright (C) 2013, 2014 several contributors, see AUTHORS
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Questions, comments, suggestions, etc to
* https://github.com/admesh/admesh/issues
*/
#include <stdlib.h>
#include <string.h>
#include "stl.h"
void
stl_invalidate_shared_vertices(stl_file *stl) {
if (stl->error) return;
if (stl->v_indices != NULL) {
free(stl->v_indices);
stl->v_indices = NULL;
}
if (stl->v_shared != NULL) {
free(stl->v_shared);
stl->v_shared = NULL;
}
}
void
stl_generate_shared_vertices(stl_file *stl) {
int i;
int j;
int first_facet;
int direction;
int facet_num;
int vnot;
int next_edge;
int pivot_vertex;
int next_facet;
int reversed;
if (stl->error) return;
/* make sure this function is idempotent and does not leak memory */
stl_invalidate_shared_vertices(stl);
stl->v_indices = (v_indices_struct*)
calloc(stl->stats.number_of_facets, sizeof(v_indices_struct));
if(stl->v_indices == NULL) perror("stl_generate_shared_vertices");
stl->v_shared = (stl_vertex*)
calloc((stl->stats.number_of_facets / 2), sizeof(stl_vertex));
if(stl->v_shared == NULL) perror("stl_generate_shared_vertices");
stl->stats.shared_malloced = stl->stats.number_of_facets / 2;
stl->stats.shared_vertices = 0;
for(i = 0; i < stl->stats.number_of_facets; i++) {
stl->v_indices[i].vertex[0] = -1;
stl->v_indices[i].vertex[1] = -1;
stl->v_indices[i].vertex[2] = -1;
}
for(i = 0; i < stl->stats.number_of_facets; i++) {
first_facet = i;
for(j = 0; j < 3; j++) {
if(stl->v_indices[i].vertex[j] != -1) {
continue;
}
if(stl->stats.shared_vertices == stl->stats.shared_malloced) {
stl->stats.shared_malloced += 1024;
stl->v_shared = (stl_vertex*)realloc(stl->v_shared,
stl->stats.shared_malloced * sizeof(stl_vertex));
if(stl->v_shared == NULL) perror("stl_generate_shared_vertices");
}
stl->v_shared[stl->stats.shared_vertices] =
stl->facet_start[i].vertex[j];
direction = 0;
reversed = 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;
}
}
stl->v_indices[facet_num].vertex[pivot_vertex] =
stl->stats.shared_vertices;
next_facet = stl->neighbors_start[facet_num].neighbor[next_edge];
if(next_facet == -1) {
if(reversed) {
break;
} else {
direction = 1;
vnot = (j + 1) % 3;
reversed = 1;
facet_num = first_facet;
}
} else if(next_facet != first_facet) {
vnot = stl->neighbors_start[facet_num].
which_vertex_not[next_edge];
facet_num = next_facet;
} else {
break;
}
}
stl->stats.shared_vertices += 1;
}
}
}
void
stl_write_off(stl_file *stl, char *file) {
int i;
FILE *fp;
char *error_msg;
if (stl->error) return;
/* Open the file */
fp = fopen(file, "w");
if(fp == NULL) {
error_msg = (char*)
malloc(81 + strlen(file)); /* Allow 80 chars+file size for message */
sprintf(error_msg, "stl_write_ascii: Couldn't open %s for writing",
file);
perror(error_msg);
free(error_msg);
stl->error = 1;
return;
}
fprintf(fp, "OFF\n");
fprintf(fp, "%d %d 0\n",
stl->stats.shared_vertices, stl->stats.number_of_facets);
for(i = 0; i < stl->stats.shared_vertices; i++) {
fprintf(fp, "\t%f %f %f\n",
stl->v_shared[i].x, stl->v_shared[i].y, stl->v_shared[i].z);
}
for(i = 0; i < stl->stats.number_of_facets; i++) {
fprintf(fp, "\t3 %d %d %d\n", stl->v_indices[i].vertex[0],
stl->v_indices[i].vertex[1], stl->v_indices[i].vertex[2]);
}
fclose(fp);
}
void
stl_write_vrml(stl_file *stl, char *file) {
int i;
FILE *fp;
char *error_msg;
if (stl->error) return;
/* Open the file */
fp = fopen(file, "w");
if(fp == NULL) {
error_msg = (char*)
malloc(81 + strlen(file)); /* Allow 80 chars+file size for message */
sprintf(error_msg, "stl_write_ascii: Couldn't open %s for writing",
file);
perror(error_msg);
free(error_msg);
stl->error = 1;
return;
}
fprintf(fp, "#VRML V1.0 ascii\n\n");
fprintf(fp, "Separator {\n");
fprintf(fp, "\tDEF STLShape ShapeHints {\n");
fprintf(fp, "\t\tvertexOrdering COUNTERCLOCKWISE\n");
fprintf(fp, "\t\tfaceType CONVEX\n");
fprintf(fp, "\t\tshapeType SOLID\n");
fprintf(fp, "\t\tcreaseAngle 0.0\n");
fprintf(fp, "\t}\n");
fprintf(fp, "\tDEF STLModel Separator {\n");
fprintf(fp, "\t\tDEF STLColor Material {\n");
fprintf(fp, "\t\t\temissiveColor 0.700000 0.700000 0.000000\n");
fprintf(fp, "\t\t}\n");
fprintf(fp, "\t\tDEF STLVertices Coordinate3 {\n");
fprintf(fp, "\t\t\tpoint [\n");
for(i = 0; i < (stl->stats.shared_vertices - 1); i++) {
fprintf(fp, "\t\t\t\t%f %f %f,\n",
stl->v_shared[i].x, stl->v_shared[i].y, stl->v_shared[i].z);
}
fprintf(fp, "\t\t\t\t%f %f %f]\n",
stl->v_shared[i].x, stl->v_shared[i].y, stl->v_shared[i].z);
fprintf(fp, "\t\t}\n");
fprintf(fp, "\t\tDEF STLTriangles IndexedFaceSet {\n");
fprintf(fp, "\t\t\tcoordIndex [\n");
for(i = 0; i < (stl->stats.number_of_facets - 1); i++) {
fprintf(fp, "\t\t\t\t%d, %d, %d, -1,\n", stl->v_indices[i].vertex[0],
stl->v_indices[i].vertex[1], stl->v_indices[i].vertex[2]);
}
fprintf(fp, "\t\t\t\t%d, %d, %d, -1]\n", stl->v_indices[i].vertex[0],
stl->v_indices[i].vertex[1], stl->v_indices[i].vertex[2]);
fprintf(fp, "\t\t}\n");
fprintf(fp, "\t}\n");
fprintf(fp, "}\n");
fclose(fp);
}
void stl_write_obj (stl_file *stl, char *file) {
int i;
FILE* fp;
if (stl->error) return;
/* Open the file */
fp = fopen(file, "w");
if (fp == NULL) {
char* error_msg = (char*)malloc(81 + strlen(file)); /* Allow 80 chars+file size for message */
sprintf(error_msg, "stl_write_ascii: Couldn't open %s for writing", file);
perror(error_msg);
free(error_msg);
stl->error = 1;
return;
}
for (i = 0; i < stl->stats.shared_vertices; i++) {
fprintf(fp, "v %f %f %f\n", stl->v_shared[i].x, stl->v_shared[i].y, stl->v_shared[i].z);
}
for (i = 0; i < stl->stats.number_of_facets; i++) {
fprintf(fp, "f %d %d %d\n", stl->v_indices[i].vertex[0]+1, stl->v_indices[i].vertex[1]+1, stl->v_indices[i].vertex[2]+1);
}
fclose(fp);
}