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Include admesh code for STL repair

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This commit is contained in:
Alessandro Ranellucci 2013-06-23 18:18:38 +02:00
parent f3a9d41c70
commit 77440b774d
11 changed files with 3164 additions and 1 deletions
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7
xs/MANIFEST
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Build.PL
lib/Slic3r/XS.pm
MANIFEST This list of files
src/admesh/connect.c
src/admesh/normals.c
src/admesh/shared.c
src/admesh/stl.h
src/admesh/stl_io.c
src/admesh/stlinit.c
src/admesh/util.c
src/myinit.h
src/ppport.h
t/01_trianglemesh.t

4
xs/MANIFEST.bak
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Build.PL
lib/Slic3r/TriangleMesh/XS.pm
lib/Slic3r/XS.pm
MANIFEST This list of files
src/myinit.h
src/ppport.h
t/01_trianglemesh.t
t/02_object.t
xsp/my.map
xsp/mytype.map
xsp/Object.xsp
xsp/TriangleMesh.xsp
xsp/typemap.xspt
xsp/XS.xsp

1123
xs/src/admesh/connect.c Normal file
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File diff suppressed because it is too large Load Diff

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xs/src/admesh/normals.c Normal file
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/* ADMesh -- process triangulated solid meshes
* Copyright (C) 1995 Anthony D. Martin
*
* 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, 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
* Questions, comments, suggestions, etc to <amartin@engr.csulb.edu>
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <math.h>
#include "stl.h"
static void stl_reverse_facet(stl_file *stl, int facet_num);
/* static float stl_calculate_area(stl_facet *facet); */
static void stl_reverse_vector(float v[]);
int stl_check_normal_vector(stl_file *stl, int facet_num, int normal_fix_flag);
static void
stl_reverse_facet(stl_file *stl, int facet_num)
{
stl_vertex tmp_vertex;
/* int tmp_neighbor;*/
int neighbor[3];
int vnot[3];
stl->stats.facets_reversed += 1;
neighbor[0] = stl->neighbors_start[facet_num].neighbor[0];
neighbor[1] = stl->neighbors_start[facet_num].neighbor[1];
neighbor[2] = stl->neighbors_start[facet_num].neighbor[2];
vnot[0] = stl->neighbors_start[facet_num].which_vertex_not[0];
vnot[1] = stl->neighbors_start[facet_num].which_vertex_not[1];
vnot[2] = stl->neighbors_start[facet_num].which_vertex_not[2];
/* reverse the facet */
tmp_vertex = stl->facet_start[facet_num].vertex[0];
stl->facet_start[facet_num].vertex[0] =
stl->facet_start[facet_num].vertex[1];
stl->facet_start[facet_num].vertex[1] = tmp_vertex;
/* fix the vnots of the neighboring facets */
if(neighbor[0] != -1)
stl->neighbors_start[neighbor[0]].which_vertex_not[(vnot[0] + 1) % 3] =
(stl->neighbors_start[neighbor[0]].
which_vertex_not[(vnot[0] + 1) % 3] + 3) % 6;
if(neighbor[1] != -1)
stl->neighbors_start[neighbor[1]].which_vertex_not[(vnot[1] + 1) % 3] =
(stl->neighbors_start[neighbor[1]].
which_vertex_not[(vnot[1] + 1) % 3] + 4) % 6;
if(neighbor[2] != -1)
stl->neighbors_start[neighbor[2]].which_vertex_not[(vnot[2] + 1) % 3] =
(stl->neighbors_start[neighbor[2]].
which_vertex_not[(vnot[2] + 1) % 3] + 2) % 6;
/* swap the neighbors of the facet that is being reversed */
stl->neighbors_start[facet_num].neighbor[1] = neighbor[2];
stl->neighbors_start[facet_num].neighbor[2] = neighbor[1];
/* swap the vnots of the facet that is being reversed */
stl->neighbors_start[facet_num].which_vertex_not[1] = vnot[2];
stl->neighbors_start[facet_num].which_vertex_not[2] = vnot[1];
/* reverse the values of the vnots of the facet that is being reversed */
stl->neighbors_start[facet_num].which_vertex_not[0] =
(stl->neighbors_start[facet_num].which_vertex_not[0] + 3) % 6;
stl->neighbors_start[facet_num].which_vertex_not[1] =
(stl->neighbors_start[facet_num].which_vertex_not[1] + 3) % 6;
stl->neighbors_start[facet_num].which_vertex_not[2] =
(stl->neighbors_start[facet_num].which_vertex_not[2] + 3) % 6;
}
void
stl_fix_normal_directions(stl_file *stl)
{
char *norm_sw;
/* int edge_num;*/
/* int vnot;*/
int checked = 0;
int facet_num;
/* int next_facet;*/
int i;
int j;
int checked_before = 0;
struct stl_normal
{
int facet_num;
struct stl_normal *next;
};
struct stl_normal *head;
struct stl_normal *tail;
struct stl_normal *newn;
struct stl_normal *temp;
/* Initialize linked list. */
head = (stl_normal*)malloc(sizeof(struct stl_normal));
if(head == NULL) perror("stl_fix_normal_directions");
tail = (stl_normal*)malloc(sizeof(struct stl_normal));
if(tail == NULL) perror("stl_fix_normal_directions");
head->next = tail;
tail->next = tail;
/* Initialize list that keeps track of already fixed facets. */
norm_sw = (char*)calloc(stl->stats.number_of_facets, sizeof(char));
if(norm_sw == NULL) perror("stl_fix_normal_directions");
facet_num = 0;
if(stl_check_normal_vector(stl, 0, 0) == 2)
stl_reverse_facet(stl, 0);
norm_sw[facet_num] = 1;
/* edge_num = 0;
vnot = stl->neighbors_start[0].which_vertex_not[0];
*/
checked++;
for(;;)
{
/* Add neighbors_to_list. */
for(j = 0; j < 3; j++)
{
/* Reverse the neighboring facets if necessary. */
if(stl->neighbors_start[facet_num].which_vertex_not[j] > 2)
{
if(stl->neighbors_start[facet_num].neighbor[j] != -1)
{
stl_reverse_facet
(stl, stl->neighbors_start[facet_num].neighbor[j]);
}
}
if(stl->neighbors_start[facet_num].neighbor[j] != -1)
{
if(norm_sw[stl->neighbors_start[facet_num].neighbor[j]] != 1)
{
/* Add node to beginning of list. */
newn = (stl_normal*)malloc(sizeof(struct stl_normal));
if(newn == NULL) perror("stl_fix_normal_directions");
newn->facet_num = stl->neighbors_start[facet_num].neighbor[j];
newn->next = head->next;
head->next = newn;
}
}
}
/* Get next facet to fix from top of list. */
if(head->next != tail)
{
facet_num = head->next->facet_num;
if(norm_sw[facet_num] != 1) /* If facet is in list mutiple times */
{
norm_sw[facet_num] = 1; /* Record this one as being fixed. */
checked++;
}
temp = head->next; /* Delete this facet from the list. */
head->next = head->next->next;
free(temp);
}
else
{
/* All of the facets in this part have been fixed. */
stl->stats.number_of_parts += 1;
/* There are (checked-checked_before) facets */
/* in part stl->stats.number_of_parts */
checked_before = checked;
if(checked == stl->stats.number_of_facets)
{
/* All of the facets have been checked. Bail out. */
break;
}
else
{
/* There is another part here. Find it and continue. */
for(i = 0; i < stl->stats.number_of_facets; i++)
{
if(norm_sw[i] == 0)
{ /* This is the first facet of the next part. */
facet_num = i;
if(stl_check_normal_vector(stl, i, 0) == 2)
{
stl_reverse_facet(stl, i);
}
norm_sw[facet_num] = 1;
checked++;
break;
}
}
}
}
}
free(head);
free(tail);
free(norm_sw);
}
int
stl_check_normal_vector(stl_file *stl, int facet_num, int normal_fix_flag)
{
/* Returns 0 if the normal is within tolerance */
/* Returns 1 if the normal is not within tolerance, but direction is OK */
/* Returns 2 if the normal is not within tolerance and backwards */
/* Returns 4 if the status is unknown. */
float normal[3];
float test_norm[3];
stl_facet *facet;
facet = &stl->facet_start[facet_num];
stl_calculate_normal(normal, facet);
stl_normalize_vector(normal);
if( (ABS(normal[0] - facet->normal.x) < 0.001)
&& (ABS(normal[1] - facet->normal.y) < 0.001)
&& (ABS(normal[2] - facet->normal.z) < 0.001))
{
/* It is not really necessary to change the values here */
/* but just for consistency, I will. */
facet->normal.x = normal[0];
facet->normal.y = normal[1];
facet->normal.z = normal[2];
return 0;
}
test_norm[0] = facet->normal.x;
test_norm[1] = facet->normal.y;
test_norm[2] = facet->normal.z;
stl_normalize_vector(test_norm);
if( (ABS(normal[0] - test_norm[0]) < 0.001)
&& (ABS(normal[1] - test_norm[1]) < 0.001)
&& (ABS(normal[2] - test_norm[2]) < 0.001))
{
if(normal_fix_flag)
{
facet->normal.x = normal[0];
facet->normal.y = normal[1];
facet->normal.z = normal[2];
stl->stats.normals_fixed += 1;
}
return 1;
}
stl_reverse_vector(test_norm);
if( (ABS(normal[0] - test_norm[0]) < 0.001)
&& (ABS(normal[1] - test_norm[1]) < 0.001)
&& (ABS(normal[2] - test_norm[2]) < 0.001))
{
/* Facet is backwards. */
if(normal_fix_flag)
{
facet->normal.x = normal[0];
facet->normal.y = normal[1];
facet->normal.z = normal[2];
stl->stats.normals_fixed += 1;
}
return 2;
}
if(normal_fix_flag)
{
facet->normal.x = normal[0];
facet->normal.y = normal[1];
facet->normal.z = normal[2];
stl->stats.normals_fixed += 1;
}
return 4;
}
static void
stl_reverse_vector(float v[])
{
v[0] *= -1;
v[1] *= -1;
v[2] *= -1;
}
void
stl_calculate_normal(float normal[], stl_facet *facet)
{
float v1[3];
float v2[3];
v1[0] = facet->vertex[1].x - facet->vertex[0].x;
v1[1] = facet->vertex[1].y - facet->vertex[0].y;
v1[2] = facet->vertex[1].z - facet->vertex[0].z;
v2[0] = facet->vertex[2].x - facet->vertex[0].x;
v2[1] = facet->vertex[2].y - facet->vertex[0].y;
v2[2] = facet->vertex[2].z - facet->vertex[0].z;
normal[0] = (float)((double)v1[1] * (double)v2[2]) - ((double)v1[2] * (double)v2[1]);
normal[1] = (float)((double)v1[2] * (double)v2[0]) - ((double)v1[0] * (double)v2[2]);
normal[2] = (float)((double)v1[0] * (double)v2[1]) - ((double)v1[1] * (double)v2[0]);
}
/*
static float
stl_calculate_area(stl_facet *facet)
{
float cross[3][3];
float sum[3];
float normal[3];
float area;
int i;
for(i = 0; i < 3; i++)
{
cross[i][0] = ((facet->vertex[i].y * facet->vertex[(i + 1) % 3].z) -
(facet->vertex[i].z * facet->vertex[(i + 1) % 3].y));
cross[i][1] = ((facet->vertex[i].z * facet->vertex[(i + 1) % 3].x) -
(facet->vertex[i].x * facet->vertex[(i + 1) % 3].z));
cross[i][2] = ((facet->vertex[i].x * facet->vertex[(i + 1) % 3].y) -
(facet->vertex[i].y * facet->vertex[(i + 1) % 3].x));
}
sum[0] = cross[0][0] + cross[1][0] + cross[2][0];
sum[1] = cross[0][1] + cross[1][1] + cross[2][1];
sum[2] = cross[0][2] + cross[1][2] + cross[2][2];
stl_calculate_normal(normal, facet);
stl_normalize_vector(normal);
area = 0.5 * (normal[0] * sum[0] + normal[1] * sum[1] +
normal[2] * sum[2]);
return ABS(area);
}
*/
void stl_normalize_vector(float v[])
{
double length;
double factor;
float min_normal_length;
length = sqrt((double)v[0] * (double)v[0] + (double)v[1] * (double)v[1] + (double)v[2] * (double)v[2]);
min_normal_length = 0.000000000001;
if(length < min_normal_length)
{
v[0] = 1.0;
v[1] = 0.0;
v[2] = 0.0;
return;
}
factor = 1.0 / length;
v[0] *= factor;
v[1] *= factor;
v[2] *= factor;
}
void
stl_fix_normal_values(stl_file *stl)
{
int i;
for(i = 0; i < stl->stats.number_of_facets; i++)
{
stl_check_normal_vector(stl, i, 1);
}
}
void
stl_reverse_all_facets(stl_file *stl)
{
int i;
float normal[3];
for(i = 0; i < stl->stats.number_of_facets; i++)
{
stl_reverse_facet(stl, i);
stl_calculate_normal(normal, &stl->facet_start[i]);
stl_normalize_vector(normal);
stl->facet_start[i].normal.x = normal[0];
stl->facet_start[i].normal.y = normal[1];
stl->facet_start[i].normal.z = normal[2];
}
}

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/* ADMesh -- process triangulated solid meshes
* Copyright (C) 1995, 1996 Anthony D. Martin
*
* 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, 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
* Questions, comments, suggestions, etc to <amartin@engr.csulb.edu>
*/
#include <cstring>
#include <stdlib.h>
#include "stl.h"
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;
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;
/* 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);
exit(1);
}
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;
/* 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);
exit(1);
}
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);
}

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/* ADMesh -- process triangulated solid meshes
* Copyright (C) 1995, 1996 Anthony D. Martin
*
* 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, 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
* Questions, comments, suggestions, etc to <amartin@engr.csulb.edu>
*/
#include <stdio.h>
#define STL_MAX(A,B) ((A)>(B)? (A):(B))
#define STL_MIN(A,B) ((A)<(B)? (A):(B))
#define ABS(X) ((X) < 0 ? -(X) : (X))
#define LABEL_SIZE 80
#define NUM_FACET_SIZE 4
#define HEADER_SIZE 84
#define STL_MIN_FILE_SIZE 284
#define ASCII_LINES_PER_FACET 7
#define SIZEOF_EDGE_SORT 24
typedef struct
{
float x;
float y;
float z;
}stl_vertex;
typedef struct
{
float x;
float y;
float z;
}stl_normal;
typedef char stl_extra[2];
typedef struct
{
stl_normal normal;
stl_vertex vertex[3];
stl_extra extra;
}stl_facet;
#define SIZEOF_STL_FACET 50
typedef enum {binary, ascii} stl_type;
typedef struct
{
stl_vertex p1;
stl_vertex p2;
int facet_number;
}stl_edge;
typedef struct stl_hash_edge
{
unsigned key[6];
int facet_number;
int which_edge;
struct stl_hash_edge *next;
}stl_hash_edge;
typedef struct
{
int neighbor[3];
char which_vertex_not[3];
}stl_neighbors;
typedef struct
{
int vertex[3];
}v_indices_struct;
typedef struct
{
char header[81];
stl_type type;
int number_of_facets;
stl_vertex max;
stl_vertex min;
stl_vertex size;
float bounding_diameter;
float shortest_edge;
float volume;
unsigned number_of_blocks;
int connected_edges;
int connected_facets_1_edge;
int connected_facets_2_edge;
int connected_facets_3_edge;
int facets_w_1_bad_edge;
int facets_w_2_bad_edge;
int facets_w_3_bad_edge;
int original_num_facets;
int edges_fixed;
int degenerate_facets;
int facets_removed;
int facets_added;
int facets_reversed;
int backwards_edges;
int normals_fixed;
int number_of_parts;
int malloced;
int freed;
int facets_malloced;
int collisions;
int shared_vertices;
int shared_malloced;
}stl_stats;
typedef struct
{
FILE *fp;
stl_facet *facet_start;
stl_edge *edge_start;
stl_hash_edge **heads;
stl_hash_edge *tail;
int M;
stl_neighbors *neighbors_start;
v_indices_struct *v_indices;
stl_vertex *v_shared;
stl_stats stats;
}stl_file;
extern void stl_open(stl_file *stl, char *file);
extern void stl_close(stl_file *stl);
extern void stl_stats_out(stl_file *stl, FILE *file, char *input_file);
extern void stl_print_edges(stl_file *stl, FILE *file);
extern void stl_print_neighbors(stl_file *stl, char *file);
extern void stl_write_ascii(stl_file *stl, char *file, char *label);
extern void stl_write_binary(stl_file *stl, char *file, char *label);
extern void stl_check_facets_exact(stl_file *stl);
extern void stl_check_facets_nearby(stl_file *stl, float tolerance);
extern void stl_remove_unconnected_facets(stl_file *stl);
extern void stl_write_vertex(stl_file *stl, int facet, int vertex);
extern void stl_write_facet(stl_file *stl, char *label, int facet);
extern void stl_write_edge(stl_file *stl, char *label, stl_hash_edge edge);
extern void stl_write_neighbor(stl_file *stl, int facet);
extern void stl_write_quad_object(stl_file *stl, char *file);
extern void stl_verify_neighbors(stl_file *stl);
extern void stl_fill_holes(stl_file *stl);
extern void stl_fix_normal_directions(stl_file *stl);
extern void stl_fix_normal_values(stl_file *stl);
extern void stl_reverse_all_facets(stl_file *stl);
extern void stl_translate(stl_file *stl, float x, float y, float z);
extern void stl_scale(stl_file *stl, float factor);
extern void stl_rotate_x(stl_file *stl, float angle);
extern void stl_rotate_y(stl_file *stl, float angle);
extern void stl_rotate_z(stl_file *stl, float angle);
extern void stl_mirror_xy(stl_file *stl);
extern void stl_mirror_yz(stl_file *stl);
extern void stl_mirror_xz(stl_file *stl);
extern void stl_open_merge(stl_file *stl, char *file);
extern void stl_generate_shared_vertices(stl_file *stl);
extern void stl_write_off(stl_file *stl, char *file);
extern void stl_write_dxf(stl_file *stl, char *file, char *label);
extern void stl_write_vrml(stl_file *stl, char *file);
extern void stl_calculate_normal(float normal[], stl_facet *facet);
extern void stl_normalize_vector(float v[]);
extern void stl_calculate_volume(stl_file *stl);

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/* ADMesh -- process triangulated solid meshes
* Copyright (C) 1995, 1996 Anthony D. Martin
*
* 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, 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
* Questions, comments, suggestions, etc to <amartin@engr.csulb.edu>
*/
#include <cstring>
#include <stdlib.h>
#include "stl.h"
#if !defined(SEEK_SET)
#define SEEK_SET 0
#define SEEK_CUR 1
#define SEEK_END 2
#endif
static void stl_put_little_int(FILE *fp, int value);
static void stl_put_little_float(FILE *fp, float value_in);
void
stl_print_edges(stl_file *stl, FILE *file)
{
int i;
int edges_allocated;
edges_allocated = stl->stats.number_of_facets * 3;
for(i = 0; i < edges_allocated; i++)
{
fprintf(file, "%d, %f, %f, %f, %f, %f, %f\n",
stl->edge_start[i].facet_number,
stl->edge_start[i].p1.x, stl->edge_start[i].p1.y,
stl->edge_start[i].p1.z, stl->edge_start[i].p2.x,
stl->edge_start[i].p2.y, stl->edge_start[i].p2.z);
}
}
void
stl_stats_out(stl_file *stl, FILE *file, char *input_file)
{
fprintf(file, "\n\
================= Results produced by ADMesh version 0.95 ================\n");
fprintf(file, "\
Input file : %s\n", input_file);
if(stl->stats.type == binary)
{
fprintf(file, "\
File type : Binary STL file\n");
}
else
{
fprintf(file, "\
File type : ASCII STL file\n");
}
fprintf(file, "\
Header : %s\n", stl->stats.header);
fprintf(file, "============== Size ==============\n");
fprintf(file, "Min X = % f, Max X = % f\n",
stl->stats.min.x, stl->stats.max.x);
fprintf(file, "Min Y = % f, Max Y = % f\n",
stl->stats.min.y, stl->stats.max.y);
fprintf(file, "Min Z = % f, Max Z = % f\n",
stl->stats.min.z, stl->stats.max.z);
fprintf(file, "\
========= Facet Status ========== Original ============ Final ====\n");
fprintf(file, "\
Number of facets : %5d %5d\n",
stl->stats.original_num_facets, stl->stats.number_of_facets);
fprintf(file, "\
Facets with 1 disconnected edge : %5d %5d\n",
stl->stats.facets_w_1_bad_edge, stl->stats.connected_facets_2_edge -
stl->stats.connected_facets_3_edge);
fprintf(file, "\
Facets with 2 disconnected edges : %5d %5d\n",
stl->stats.facets_w_2_bad_edge, stl->stats.connected_facets_1_edge -
stl->stats.connected_facets_2_edge);
fprintf(file, "\
Facets with 3 disconnected edges : %5d %5d\n",
stl->stats.facets_w_3_bad_edge, stl->stats.number_of_facets -
stl->stats.connected_facets_1_edge);
fprintf(file, "\
Total disconnected facets : %5d %5d\n",
stl->stats.facets_w_1_bad_edge + stl->stats.facets_w_2_bad_edge +
stl->stats.facets_w_3_bad_edge, stl->stats.number_of_facets -
stl->stats.connected_facets_3_edge);
fprintf(file,
"=== Processing Statistics === ===== Other Statistics =====\n");
fprintf(file, "\
Number of parts : %5d Volume : % f\n",
stl->stats.number_of_parts, stl->stats.volume);
fprintf(file, "\
Degenerate facets : %5d\n", stl->stats.degenerate_facets);
fprintf(file, "\
Edges fixed : %5d\n", stl->stats.edges_fixed);
fprintf(file, "\
Facets removed : %5d\n", stl->stats.facets_removed);
fprintf(file, "\
Facets added : %5d\n", stl->stats.facets_added);
fprintf(file, "\
Facets reversed : %5d\n", stl->stats.facets_reversed);
fprintf(file, "\
Backwards edges : %5d\n", stl->stats.backwards_edges);
fprintf(file, "\
Normals fixed : %5d\n", stl->stats.normals_fixed);
}
void
stl_write_ascii(stl_file *stl, char *file, char *label)
{
int i;
FILE *fp;
char *error_msg;
/* 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);
exit(1);
}
fprintf(fp, "solid %s\n", label);
for(i = 0; i < stl->stats.number_of_facets; i++)
{
fprintf(fp, " facet normal % .8E % .8E % .8E\n",
stl->facet_start[i].normal.x, stl->facet_start[i].normal.y,
stl->facet_start[i].normal.z);
fprintf(fp, " outer loop\n");
fprintf(fp, " vertex % .8E % .8E % .8E\n",
stl->facet_start[i].vertex[0].x, stl->facet_start[i].vertex[0].y,
stl->facet_start[i].vertex[0].z);
fprintf(fp, " vertex % .8E % .8E % .8E\n",
stl->facet_start[i].vertex[1].x, stl->facet_start[i].vertex[1].y,
stl->facet_start[i].vertex[1].z);
fprintf(fp, " vertex % .8E % .8E % .8E\n",
stl->facet_start[i].vertex[2].x, stl->facet_start[i].vertex[2].y,
stl->facet_start[i].vertex[2].z);
fprintf(fp, " endloop\n");
fprintf(fp, " endfacet\n");
}
fprintf(fp, "endsolid %s\n", label);
fclose(fp);
}
void
stl_print_neighbors(stl_file *stl, char *file)
{
int i;
FILE *fp;
char *error_msg;
/* 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_print_neighbors: Couldn't open %s for writing",
file);
perror(error_msg);
free(error_msg);
exit(1);
}
for(i = 0; i < stl->stats.number_of_facets; i++)
{
fprintf(fp, "%d, %d,%d, %d,%d, %d,%d\n",
i,
stl->neighbors_start[i].neighbor[0],
(int)stl->neighbors_start[i].which_vertex_not[0],
stl->neighbors_start[i].neighbor[1],
(int)stl->neighbors_start[i].which_vertex_not[1],
stl->neighbors_start[i].neighbor[2],
(int)stl->neighbors_start[i].which_vertex_not[2]);
}
}
static void
stl_put_little_int(FILE *fp, int value_in)
{
int new_value;
union
{
int int_value;
char char_value[4];
} value;
value.int_value = value_in;
new_value = value.char_value[0] & 0xFF;
new_value |= (value.char_value[1] & 0xFF) << 0x08;
new_value |= (value.char_value[2] & 0xFF) << 0x10;
new_value |= (value.char_value[3] & 0xFF) << 0x18;
fwrite(&new_value, sizeof(int), 1, fp);
}
static void
stl_put_little_float(FILE *fp, float value_in)
{
int new_value;
union
{
float float_value;
char char_value[4];
} value;
value.float_value = value_in;
new_value = value.char_value[0] & 0xFF;
new_value |= (value.char_value[1] & 0xFF) << 0x08;
new_value |= (value.char_value[2] & 0xFF) << 0x10;
new_value |= (value.char_value[3] & 0xFF) << 0x18;
fwrite(&new_value, sizeof(int), 1, fp);
}
void
stl_write_binary(stl_file *stl, char *file, char *label)
{
FILE *fp;
int i;
char *error_msg;
/* 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_binary: Couldn't open %s for writing",
file);
perror(error_msg);
free(error_msg);
exit(1);
}
fprintf(fp, "%s", label);
for(i = strlen(label); i < LABEL_SIZE; i++) putc(0, fp);
fseek(fp, LABEL_SIZE, SEEK_SET);
stl_put_little_int(fp, stl->stats.number_of_facets);
for(i = 0; i < stl->stats.number_of_facets; i++)
{
stl_put_little_float(fp, stl->facet_start[i].normal.x);
stl_put_little_float(fp, stl->facet_start[i].normal.y);
stl_put_little_float(fp, stl->facet_start[i].normal.z);
stl_put_little_float(fp, stl->facet_start[i].vertex[0].x);
stl_put_little_float(fp, stl->facet_start[i].vertex[0].y);
stl_put_little_float(fp, stl->facet_start[i].vertex[0].z);
stl_put_little_float(fp, stl->facet_start[i].vertex[1].x);
stl_put_little_float(fp, stl->facet_start[i].vertex[1].y);
stl_put_little_float(fp, stl->facet_start[i].vertex[1].z);
stl_put_little_float(fp, stl->facet_start[i].vertex[2].x);
stl_put_little_float(fp, stl->facet_start[i].vertex[2].y);
stl_put_little_float(fp, stl->facet_start[i].vertex[2].z);
fputc(stl->facet_start[i].extra[0], fp);
fputc(stl->facet_start[i].extra[1], fp);
}
fclose(fp);
}
void
stl_write_vertex(stl_file *stl, int facet, int vertex)
{
printf(" vertex %d/%d % .8E % .8E % .8E\n", vertex, facet,
stl->facet_start[facet].vertex[vertex].x,
stl->facet_start[facet].vertex[vertex].y,
stl->facet_start[facet].vertex[vertex].z);
}
void
stl_write_facet(stl_file *stl, char *label, int facet)
{
printf("facet (%d)/ %s\n", facet, label);
stl_write_vertex(stl, facet, 0);
stl_write_vertex(stl, facet, 1);
stl_write_vertex(stl, facet, 2);
}
void
stl_write_edge(stl_file *stl, char *label, stl_hash_edge edge)
{
printf("edge (%d)/(%d) %s\n", edge.facet_number, edge.which_edge, label);
if(edge.which_edge < 3)
{
stl_write_vertex(stl, edge.facet_number, edge.which_edge % 3);
stl_write_vertex(stl, edge.facet_number, (edge.which_edge + 1) % 3);
}
else
{
stl_write_vertex(stl, edge.facet_number, (edge.which_edge + 1) % 3);
stl_write_vertex(stl, edge.facet_number, edge.which_edge % 3);
}
}
void
stl_write_neighbor(stl_file *stl, int facet)
{
printf("Neighbors %d: %d, %d, %d ; %d, %d, %d\n", facet,
stl->neighbors_start[facet].neighbor[0],
stl->neighbors_start[facet].neighbor[1],
stl->neighbors_start[facet].neighbor[2],
stl->neighbors_start[facet].which_vertex_not[0],
stl->neighbors_start[facet].which_vertex_not[1],
stl->neighbors_start[facet].which_vertex_not[2]);
}
void
stl_write_quad_object(stl_file *stl, char *file)
{
FILE *fp;
int i;
int j;
char *error_msg;
stl_vertex connect_color;
stl_vertex uncon_1_color;
stl_vertex uncon_2_color;
stl_vertex uncon_3_color;
stl_vertex color;
/* 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_quad_object: Couldn't open %s for writing",
file);
perror(error_msg);
free(error_msg);
exit(1);
}
connect_color.x = 0.0;
connect_color.y = 0.0;
connect_color.z = 1.0;
uncon_1_color.x = 0.0;
uncon_1_color.y = 1.0;
uncon_1_color.z = 0.0;
uncon_2_color.x = 1.0;
uncon_2_color.y = 1.0;
uncon_2_color.z = 1.0;
uncon_3_color.x = 1.0;
uncon_3_color.y = 0.0;
uncon_3_color.z = 0.0;
fprintf(fp, "CQUAD\n");
for(i = 0; i < stl->stats.number_of_facets; i++)
{
j = ((stl->neighbors_start[i].neighbor[0] == -1) +
(stl->neighbors_start[i].neighbor[1] == -1) +
(stl->neighbors_start[i].neighbor[2] == -1));
if(j == 0)
{
color = connect_color;
}
else if(j == 1)
{
color = uncon_1_color;
}
else if(j == 2)
{
color = uncon_2_color;
}
else
{
color = uncon_3_color;
}
fprintf(fp, "%f %f %f %1.1f %1.1f %1.1f 1\n",
stl->facet_start[i].vertex[0].x,
stl->facet_start[i].vertex[0].y,
stl->facet_start[i].vertex[0].z, color.x, color.y, color.z);
fprintf(fp, "%f %f %f %1.1f %1.1f %1.1f 1\n",
stl->facet_start[i].vertex[1].x,
stl->facet_start[i].vertex[1].y,
stl->facet_start[i].vertex[1].z, color.x, color.y, color.z);
fprintf(fp, "%f %f %f %1.1f %1.1f %1.1f 1\n",
stl->facet_start[i].vertex[2].x,
stl->facet_start[i].vertex[2].y,
stl->facet_start[i].vertex[2].z, color.x, color.y, color.z);
fprintf(fp, "%f %f %f %1.1f %1.1f %1.1f 1\n",
stl->facet_start[i].vertex[2].x,
stl->facet_start[i].vertex[2].y,
stl->facet_start[i].vertex[2].z, color.x, color.y, color.z);
}
fclose(fp);
}
void
stl_write_dxf(stl_file *stl, char *file, char *label)
{
int i;
FILE *fp;
char *error_msg;
/* 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);
exit(1);
}
fprintf(fp, "999\n%s\n", label);
fprintf(fp, "0\nSECTION\n2\nHEADER\n0\nENDSEC\n");
fprintf(fp, "0\nSECTION\n2\nTABLES\n0\nTABLE\n2\nLAYER\n70\n1\n\
0\nLAYER\n2\n0\n70\n0\n62\n7\n6\nCONTINUOUS\n0\nENDTAB\n0\nENDSEC\n");
fprintf(fp, "0\nSECTION\n2\nBLOCKS\n0\nENDSEC\n");
fprintf(fp, "0\nSECTION\n2\nENTITIES\n");
for(i = 0; i < stl->stats.number_of_facets; i++)
{
fprintf(fp, "0\n3DFACE\n8\n0\n");
fprintf(fp, "10\n%f\n20\n%f\n30\n%f\n",
stl->facet_start[i].vertex[0].x, stl->facet_start[i].vertex[0].y,
stl->facet_start[i].vertex[0].z);
fprintf(fp, "11\n%f\n21\n%f\n31\n%f\n",
stl->facet_start[i].vertex[1].x, stl->facet_start[i].vertex[1].y,
stl->facet_start[i].vertex[1].z);
fprintf(fp, "12\n%f\n22\n%f\n32\n%f\n",
stl->facet_start[i].vertex[2].x, stl->facet_start[i].vertex[2].y,
stl->facet_start[i].vertex[2].z);
fprintf(fp, "13\n%f\n23\n%f\n33\n%f\n",
stl->facet_start[i].vertex[2].x, stl->facet_start[i].vertex[2].y,
stl->facet_start[i].vertex[2].z);
}
fprintf(fp, "0\nENDSEC\n0\nEOF\n");
fclose(fp);
}

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/* ADMesh -- process triangulated solid meshes
* Copyright (C) 1995, 1996 Anthony D. Martin
*
* 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, 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
* Questions, comments, suggestions, etc to <amartin@engr.csulb.edu>
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <math.h>
#include "stl.h"
#if !defined(SEEK_SET)
#define SEEK_SET 0
#define SEEK_CUR 1
#define SEEK_END 2
#endif
static void stl_initialize(stl_file *stl, char *file);
static void stl_allocate(stl_file *stl);
static void stl_read(stl_file *stl, int first_facet, int first);
static void stl_reallocate(stl_file *stl);
static int stl_get_little_int(FILE *fp);
static float stl_get_little_float(FILE *fp);
void
stl_open(stl_file *stl, char *file)
{
stl_initialize(stl, file);
stl_allocate(stl);
stl_read(stl, 0, 1);
fclose(stl->fp);
}
static int
stl_get_little_int(FILE *fp)
{
int value;
value = fgetc(fp) & 0xFF;
value |= (fgetc(fp) & 0xFF) << 0x08;
value |= (fgetc(fp) & 0xFF) << 0x10;
value |= (fgetc(fp) & 0xFF) << 0x18;
return(value);
}
static float
stl_get_little_float(FILE *fp)
{
union
{
int int_value;
float float_value;
} value;
value.int_value = fgetc(fp) & 0xFF;
value.int_value |= (fgetc(fp) & 0xFF) << 0x08;
value.int_value |= (fgetc(fp) & 0xFF) << 0x10;
value.int_value |= (fgetc(fp) & 0xFF) << 0x18;
return(value.float_value);
}
static void
stl_initialize(stl_file *stl, char *file)
{
long file_size;
int header_num_facets;
int num_facets;
int i, j;
unsigned char chtest[128];
int num_lines = 1;
char *error_msg;
stl->stats.degenerate_facets = 0;
stl->stats.edges_fixed = 0;
stl->stats.facets_added = 0;
stl->stats.facets_removed = 0;
stl->stats.facets_reversed = 0;
stl->stats.normals_fixed = 0;
stl->stats.number_of_parts = 0;
stl->stats.original_num_facets = 0;
stl->stats.number_of_facets = 0;
stl->stats.volume = -1.0;
stl->neighbors_start = NULL;
stl->facet_start = NULL;
stl->v_indices = NULL;
stl->v_shared = NULL;
/* Open the file */
stl->fp = fopen(file, "r");
if(stl->fp == NULL)
{
error_msg = (char*)
malloc(81 + strlen(file)); /* Allow 80 chars+file size for message */
sprintf(error_msg, "stl_initialize: Couldn't open %s for reading",
file);
perror(error_msg);
free(error_msg);
exit(1);
}
/* Find size of file */
fseek(stl->fp, 0, SEEK_END);
file_size = ftell(stl->fp);
/* Check for binary or ASCII file */
fseek(stl->fp, HEADER_SIZE, SEEK_SET);
fread(chtest, sizeof(chtest), 1, stl->fp);
stl->stats.type = ascii;
for(i = 0; i < sizeof(chtest); i++)
{
if(chtest[i] > 127)
{
stl->stats.type = binary;
break;
}
}
rewind(stl->fp);
/* Get the header and the number of facets in the .STL file */
/* If the .STL file is binary, then do the following */
if(stl->stats.type == binary)
{
/* Test if the STL file has the right size */
if(((file_size - HEADER_SIZE) % SIZEOF_STL_FACET != 0)
|| (file_size < STL_MIN_FILE_SIZE))
{
fprintf(stderr, "The file %s has the wrong size.\n", file);
exit(1);
}
num_facets = (file_size - HEADER_SIZE) / SIZEOF_STL_FACET;
/* Read the header */
fread(stl->stats.header, LABEL_SIZE, 1, stl->fp);
stl->stats.header[80] = '\0';
/* Read the int following the header. This should contain # of facets */
header_num_facets = stl_get_little_int(stl->fp);
if(num_facets != header_num_facets)
{
fprintf(stderr,
"Warning: File size doesn't match number of facets in the header\n");
}
}
/* Otherwise, if the .STL file is ASCII, then do the following */
else
{
/* Find the number of facets */
j = 0;
for(i = 0; i < file_size ; i++)
{
j++;
if(getc(stl->fp) == '\n')
{
if(j > 4) /* don't count short lines */
{
num_lines++;
}
j = 0;
}
}
rewind(stl->fp);
/* Get the header */
for(i = 0;
(i < 80) && (stl->stats.header[i] = getc(stl->fp)) != '\n'; i++);
stl->stats.header[i] = '\0'; /* Lose the '\n' */
stl->stats.header[80] = '\0';
num_facets = num_lines / ASCII_LINES_PER_FACET;
}
stl->stats.number_of_facets += num_facets;
stl->stats.original_num_facets = stl->stats.number_of_facets;
}
static void
stl_allocate(stl_file *stl)
{
/* Allocate memory for the entire .STL file */
stl->facet_start = (stl_facet*)calloc(stl->stats.number_of_facets,
sizeof(stl_facet));
if(stl->facet_start == NULL) perror("stl_initialize");
stl->stats.facets_malloced = stl->stats.number_of_facets;
/* Allocate memory for the neighbors list */
stl->neighbors_start = (stl_neighbors*)
calloc(stl->stats.number_of_facets, sizeof(stl_neighbors));
if(stl->facet_start == NULL) perror("stl_initialize");
}
void
stl_open_merge(stl_file *stl, char *file)
{
int first_facet;
first_facet = stl->stats.number_of_facets;
stl_initialize(stl, file);
stl_reallocate(stl);
stl_read(stl, first_facet, 0);
}
static void
stl_reallocate(stl_file *stl)
{
/* Reallocate more memory for the .STL file(s) */
stl->facet_start = (stl_facet*)realloc(stl->facet_start, stl->stats.number_of_facets *
sizeof(stl_facet));
if(stl->facet_start == NULL) perror("stl_initialize");
stl->stats.facets_malloced = stl->stats.number_of_facets;
/* Reallocate more memory for the neighbors list */
stl->neighbors_start = (stl_neighbors*)
realloc(stl->neighbors_start, stl->stats.number_of_facets *
sizeof(stl_neighbors));
if(stl->facet_start == NULL) perror("stl_initialize");
}
static void
stl_read(stl_file *stl, int first_facet, int first)
{
stl_facet facet;
int i;
float diff_x;
float diff_y;
float diff_z;
float max_diff;
if(stl->stats.type == binary)
{
fseek(stl->fp, HEADER_SIZE, SEEK_SET);
}
else
{
rewind(stl->fp);
/* Skip the first line of the file */
while(getc(stl->fp) != '\n');
}
for(i = first_facet; i < stl->stats.number_of_facets; i++)
{
if(stl->stats.type == binary)
/* Read a single facet from a binary .STL file */
{
facet.normal.x = stl_get_little_float(stl->fp);
facet.normal.y = stl_get_little_float(stl->fp);
facet.normal.z = stl_get_little_float(stl->fp);
facet.vertex[0].x = stl_get_little_float(stl->fp);
facet.vertex[0].y = stl_get_little_float(stl->fp);
facet.vertex[0].z = stl_get_little_float(stl->fp);
facet.vertex[1].x = stl_get_little_float(stl->fp);
facet.vertex[1].y = stl_get_little_float(stl->fp);
facet.vertex[1].z = stl_get_little_float(stl->fp);
facet.vertex[2].x = stl_get_little_float(stl->fp);
facet.vertex[2].y = stl_get_little_float(stl->fp);
facet.vertex[2].z = stl_get_little_float(stl->fp);
facet.extra[0] = fgetc(stl->fp);
facet.extra[1] = fgetc(stl->fp);
}
else
/* Read a single facet from an ASCII .STL file */
{
fscanf(stl->fp, "%*s %*s %f %f %f\n", &facet.normal.x,
&facet.normal.y, &facet.normal.z);
fscanf(stl->fp, "%*s %*s");
fscanf(stl->fp, "%*s %f %f %f\n", &facet.vertex[0].x,
&facet.vertex[0].y, &facet.vertex[0].z);
fscanf(stl->fp, "%*s %f %f %f\n", &facet.vertex[1].x,
&facet.vertex[1].y, &facet.vertex[1].z);
fscanf(stl->fp, "%*s %f %f %f\n", &facet.vertex[2].x,
&facet.vertex[2].y, &facet.vertex[2].z);
fscanf(stl->fp, "%*s");
fscanf(stl->fp, "%*s");
}
/* Write the facet into memory. */
stl->facet_start[i] = facet;
/* while we are going through all of the facets, let's find the */
/* maximum and minimum values for x, y, and z */
/* Initialize the max and min values the first time through*/
if(first)
{
stl->stats.max.x = facet.vertex[0].x;
stl->stats.min.x = facet.vertex[0].x;
stl->stats.max.y = facet.vertex[0].y;
stl->stats.min.y = facet.vertex[0].y;
stl->stats.max.z = facet.vertex[0].z;
stl->stats.min.z = facet.vertex[0].z;
diff_x = ABS(facet.vertex[0].x - facet.vertex[1].x);
diff_y = ABS(facet.vertex[0].y - facet.vertex[1].y);
diff_z = ABS(facet.vertex[0].z - facet.vertex[1].z);
max_diff = STL_MAX(diff_x, diff_y);
max_diff = STL_MAX(diff_z, max_diff);
stl->stats.shortest_edge = max_diff;
first = 0;
}
/* now find the max and min values */
stl->stats.max.x = STL_MAX(stl->stats.max.x, facet.vertex[0].x);
stl->stats.min.x = STL_MIN(stl->stats.min.x, facet.vertex[0].x);
stl->stats.max.y = STL_MAX(stl->stats.max.y, facet.vertex[0].y);
stl->stats.min.y = STL_MIN(stl->stats.min.y, facet.vertex[0].y);
stl->stats.max.z = STL_MAX(stl->stats.max.z, facet.vertex[0].z);
stl->stats.min.z = STL_MIN(stl->stats.min.z, facet.vertex[0].z);
stl->stats.max.x = STL_MAX(stl->stats.max.x, facet.vertex[1].x);
stl->stats.min.x = STL_MIN(stl->stats.min.x, facet.vertex[1].x);
stl->stats.max.y = STL_MAX(stl->stats.max.y, facet.vertex[1].y);
stl->stats.min.y = STL_MIN(stl->stats.min.y, facet.vertex[1].y);
stl->stats.max.z = STL_MAX(stl->stats.max.z, facet.vertex[1].z);
stl->stats.min.z = STL_MIN(stl->stats.min.z, facet.vertex[1].z);
stl->stats.max.x = STL_MAX(stl->stats.max.x, facet.vertex[2].x);
stl->stats.min.x = STL_MIN(stl->stats.min.x, facet.vertex[2].x);
stl->stats.max.y = STL_MAX(stl->stats.max.y, facet.vertex[2].y);
stl->stats.min.y = STL_MIN(stl->stats.min.y, facet.vertex[2].y);
stl->stats.max.z = STL_MAX(stl->stats.max.z, facet.vertex[2].z);
stl->stats.min.z = STL_MIN(stl->stats.min.z, facet.vertex[2].z);
}
stl->stats.size.x = stl->stats.max.x - stl->stats.min.x;
stl->stats.size.y = stl->stats.max.y - stl->stats.min.y;
stl->stats.size.z = stl->stats.max.z - stl->stats.min.z;
stl->stats.bounding_diameter =
sqrt(stl->stats.size.x * stl->stats.size.x +
stl->stats.size.y * stl->stats.size.y +
stl->stats.size.z * stl->stats.size.z);
}
void
stl_close(stl_file *stl)
{
if(stl->neighbors_start != NULL)
free(stl->neighbors_start);
if(stl->facet_start != NULL)
free(stl->facet_start);
if(stl->v_indices != NULL)
free(stl->v_indices);
if(stl->v_shared != NULL)
free(stl->v_shared);
}

372
xs/src/admesh/util.c Normal file
View File

@ -0,0 +1,372 @@
/* ADMesh -- process triangulated solid meshes
* Copyright (C) 1995, 1996 Anthony D. Martin
*
* 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, 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
* Questions, comments, suggestions, etc to <amartin@engr.csulb.edu>
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <math.h>
#include "stl.h"
static void stl_rotate(float *x, float *y, float angle);
static void stl_get_size(stl_file *stl);
static float get_area(stl_facet *facet);
static float get_volume(stl_file *stl);
void
stl_verify_neighbors(stl_file *stl)
{
int i;
int j;
stl_edge edge_a;
stl_edge edge_b;
int neighbor;
int vnot;
stl->stats.backwards_edges = 0;
for(i = 0; i < stl->stats.number_of_facets; i++)
{
for(j = 0; j < 3; j++)
{
edge_a.p1 = stl->facet_start[i].vertex[j];
edge_a.p2 = stl->facet_start[i].vertex[(j + 1) % 3];
neighbor = stl->neighbors_start[i].neighbor[j];
vnot = stl->neighbors_start[i].which_vertex_not[j];
if(neighbor == -1)
continue; /* this edge has no neighbor... Continue. */
if(vnot < 3)
{
edge_b.p1 = stl->facet_start[neighbor].vertex[(vnot + 2) % 3];
edge_b.p2 = stl->facet_start[neighbor].vertex[(vnot + 1) % 3];
}
else
{
stl->stats.backwards_edges += 1;
edge_b.p1 = stl->facet_start[neighbor].vertex[(vnot + 1) % 3];
edge_b.p2 = stl->facet_start[neighbor].vertex[(vnot + 2) % 3];
}
if(memcmp(&edge_a, &edge_b, SIZEOF_EDGE_SORT) != 0)
{
/* These edges should match but they don't. Print results. */
printf("edge %d of facet %d doesn't match edge %d of facet %d\n",
j, i, vnot + 1, neighbor);
stl_write_facet(stl, (char*)"first facet", i);
stl_write_facet(stl, (char*)"second facet", neighbor);
}
}
}
}
void
stl_translate(stl_file *stl, float x, float y, float z)
{
int i;
int j;
for(i = 0; i < stl->stats.number_of_facets; i++)
{
for(j = 0; j < 3; j++)
{
stl->facet_start[i].vertex[j].x -= (stl->stats.min.x - x);
stl->facet_start[i].vertex[j].y -= (stl->stats.min.y - y);
stl->facet_start[i].vertex[j].z -= (stl->stats.min.z - z);
}
}
stl->stats.max.x -= (stl->stats.min.x - x);
stl->stats.max.y -= (stl->stats.min.y - y);
stl->stats.max.z -= (stl->stats.min.z - z);
stl->stats.min.x = x;
stl->stats.min.y = y;
stl->stats.min.z = z;
}
void
stl_scale(stl_file *stl, float factor)
{
int i;
int j;
stl->stats.min.x *= factor;
stl->stats.min.y *= factor;
stl->stats.min.z *= factor;
stl->stats.max.x *= factor;
stl->stats.max.y *= factor;
stl->stats.max.z *= factor;
for(i = 0; i < stl->stats.number_of_facets; i++)
{
for(j = 0; j < 3; j++)
{
stl->facet_start[i].vertex[j].x *= factor;
stl->facet_start[i].vertex[j].y *= factor;
stl->facet_start[i].vertex[j].z *= factor;
}
}
}
static void calculate_normals(stl_file *stl)
{
long i;
float normal[3];
for(i = 0; i < stl->stats.number_of_facets; i++){
stl_calculate_normal(normal, &stl->facet_start[i]);
stl_normalize_vector(normal);
stl->facet_start[i].normal.x = normal[0];
stl->facet_start[i].normal.y = normal[1];
stl->facet_start[i].normal.z = normal[2];
}
}
void
stl_rotate_x(stl_file *stl, float angle)
{
int i;
int j;
for(i = 0; i < stl->stats.number_of_facets; i++)
{
for(j = 0; j < 3; j++)
{
stl_rotate(&stl->facet_start[i].vertex[j].y,
&stl->facet_start[i].vertex[j].z, angle);
}
}
stl_get_size(stl);
calculate_normals(stl);
}
void
stl_rotate_y(stl_file *stl, float angle)
{
int i;
int j;
for(i = 0; i < stl->stats.number_of_facets; i++)
{
for(j = 0; j < 3; j++)
{
stl_rotate(&stl->facet_start[i].vertex[j].z,
&stl->facet_start[i].vertex[j].x, angle);
}
}
stl_get_size(stl);
calculate_normals(stl);
}
void
stl_rotate_z(stl_file *stl, float angle)
{
int i;
int j;
for(i = 0; i < stl->stats.number_of_facets; i++)
{
for(j = 0; j < 3; j++)
{
stl_rotate(&stl->facet_start[i].vertex[j].x,
&stl->facet_start[i].vertex[j].y, angle);
}
}
stl_get_size(stl);
calculate_normals(stl);
}
static void
stl_rotate(float *x, float *y, float angle)
{
double r;
double theta;
double radian_angle;
radian_angle = (angle / 180.0) * M_PI;
r = sqrt((*x * *x) + (*y * *y));
theta = atan2(*y, *x);
*x = r * cos(theta + radian_angle);
*y = r * sin(theta + radian_angle);
}
static void
stl_get_size(stl_file *stl)
{
int i;
int j;
stl->stats.min.x = stl->facet_start[0].vertex[0].x;
stl->stats.min.y = stl->facet_start[0].vertex[0].y;
stl->stats.min.z = stl->facet_start[0].vertex[0].z;
stl->stats.max.x = stl->facet_start[0].vertex[0].x;
stl->stats.max.y = stl->facet_start[0].vertex[0].y;
stl->stats.max.z = stl->facet_start[0].vertex[0].z;
for(i = 0; i < stl->stats.number_of_facets; i++)
{
for(j = 0; j < 3; j++)
{
stl->stats.min.x = STL_MIN(stl->stats.min.x,
stl->facet_start[i].vertex[j].x);
stl->stats.min.y = STL_MIN(stl->stats.min.y,
stl->facet_start[i].vertex[j].y);
stl->stats.min.z = STL_MIN(stl->stats.min.z,
stl->facet_start[i].vertex[j].z);
stl->stats.max.x = STL_MAX(stl->stats.max.x,
stl->facet_start[i].vertex[j].x);
stl->stats.max.y = STL_MAX(stl->stats.max.y,
stl->facet_start[i].vertex[j].y);
stl->stats.max.z = STL_MAX(stl->stats.max.z,
stl->facet_start[i].vertex[j].z);
}
}
}
void
stl_mirror_xy(stl_file *stl)
{
int i;
int j;
float temp_size;
for(i = 0; i < stl->stats.number_of_facets; i++)
{
for(j = 0; j < 3; j++)
{
stl->facet_start[i].vertex[j].z *= -1.0;
}
}
temp_size = stl->stats.min.z;
stl->stats.min.z = stl->stats.max.z;
stl->stats.max.z = temp_size;
stl->stats.min.z *= -1.0;
stl->stats.max.z *= -1.0;
}
void
stl_mirror_yz(stl_file *stl)
{
int i;
int j;
float temp_size;
for(i = 0; i < stl->stats.number_of_facets; i++)
{
for(j = 0; j < 3; j++)
{
stl->facet_start[i].vertex[j].x *= -1.0;
}
}
temp_size = stl->stats.min.x;
stl->stats.min.x = stl->stats.max.x;
stl->stats.max.x = temp_size;
stl->stats.min.x *= -1.0;
stl->stats.max.x *= -1.0;
}
void
stl_mirror_xz(stl_file *stl)
{
int i;
int j;
float temp_size;
for(i = 0; i < stl->stats.number_of_facets; i++)
{
for(j = 0; j < 3; j++)
{
stl->facet_start[i].vertex[j].y *= -1.0;
}
}
temp_size = stl->stats.min.y;
stl->stats.min.y = stl->stats.max.y;
stl->stats.max.y = temp_size;
stl->stats.min.y *= -1.0;
stl->stats.max.y *= -1.0;
}
static float get_volume(stl_file *stl)
{
long i;
stl_vertex p0;
stl_vertex p;
stl_normal n;
float height;
float area;
float volume = 0.0;
/* Choose a point, any point as the reference */
p0.x = stl->facet_start[0].vertex[0].x;
p0.y = stl->facet_start[0].vertex[0].y;
p0.z = stl->facet_start[0].vertex[0].z;
for(i = 0; i < stl->stats.number_of_facets; i++){
p.x = stl->facet_start[i].vertex[0].x - p0.x;
p.y = stl->facet_start[i].vertex[0].y - p0.y;
p.z = stl->facet_start[i].vertex[0].z - p0.z;
/* Do dot product to get distance from point to plane */
n = stl->facet_start[i].normal;
height = (n.x * p.x) + (n.y * p.y) + (n.z * p.z);
area = get_area(&stl->facet_start[i]);
volume += (area * height) / 3.0;
}
return volume;
}
void stl_calculate_volume(stl_file *stl)
{
stl->stats.volume = get_volume(stl);
if(stl->stats.volume < 0.0){
stl_reverse_all_facets(stl);
stl->stats.volume = -stl->stats.volume;
}
}
static float get_area(stl_facet *facet)
{
float cross[3][3];
float sum[3];
float n[3];
float area;
int i;
for(i = 0; i < 3; i++){
cross[i][0]=((facet->vertex[i].y * facet->vertex[(i + 1) % 3].z) -
(facet->vertex[i].z * facet->vertex[(i + 1) % 3].y));
cross[i][1]=((facet->vertex[i].z * facet->vertex[(i + 1) % 3].x) -
(facet->vertex[i].x * facet->vertex[(i + 1) % 3].z));
cross[i][2]=((facet->vertex[i].x * facet->vertex[(i + 1) % 3].y) -
(facet->vertex[i].y * facet->vertex[(i + 1) % 3].x));
}
sum[0] = cross[0][0] + cross[1][0] + cross[2][0];
sum[1] = cross[0][1] + cross[1][1] + cross[2][1];
sum[2] = cross[0][2] + cross[1][2] + cross[2][2];
/* This should already be done. But just in case, let's do it again */
stl_calculate_normal(n, facet);
stl_normalize_vector(n);
area = 0.5 * (n[0] * sum[0] + n[1] * sum[1] + n[2] * sum[2]);
return area;
}

2
xs/src/myinit.h
View File

@ -18,4 +18,6 @@ ZTable::ZTable(std::vector<unsigned int>* ztable) :
{
}
#include <admesh/stl.h>
#endif

23
xs/xsp/TriangleMesh.xsp
View File

@ -4,6 +4,8 @@
%{
PROTOTYPES: DISABLE
#include <myinit.h>
std::string
hello_world()
CODE:
@ -11,4 +13,25 @@ hello_world()
OUTPUT:
RETVAL
float
stl_volume(filename)
char* filename;
CODE:
stl_file stl_in;
stl_open(&stl_in, filename);
stl_check_facets_exact(&stl_in);
stl_in.stats.facets_w_1_bad_edge = (stl_in.stats.connected_facets_2_edge - stl_in.stats.connected_facets_3_edge);
stl_in.stats.facets_w_2_bad_edge = (stl_in.stats.connected_facets_1_edge - stl_in.stats.connected_facets_2_edge);
stl_in.stats.facets_w_3_bad_edge = (stl_in.stats.number_of_facets - stl_in.stats.connected_facets_1_edge);
stl_fix_normal_directions(&stl_in);
stl_fix_normal_values(&stl_in);
stl_calculate_volume(&stl_in);
RETVAL = stl_in.stats.volume;
stl_close(&stl_in);
OUTPUT:
RETVAL
%}