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stl.h

/*  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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