[37] | 1 | /* |
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| 2 | |
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| 3 | Scale and translate a PLY object so that it fits within a given bounding box. |
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| 4 | |
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| 5 | Greg Turk, August 1994 |
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| 6 | |
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| 7 | */ |
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| 8 | |
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| 9 | #include <stdio.h> |
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| 10 | #include <stdlib.h> |
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| 11 | #include <math.h> |
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| 12 | #include <malloc.h> |
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| 13 | #include <ply.h> |
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| 14 | |
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| 15 | |
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| 16 | /* user's vertex and face definitions for a polygonal object */ |
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| 17 | |
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| 18 | typedef struct Vertex { |
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| 19 | float x,y,z; |
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| 20 | void *other_props; /* other properties */ |
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| 21 | } Vertex; |
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| 22 | |
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| 23 | char *elem_names[] = { /* list of the kinds of elements in the user's object */ |
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| 24 | "vertex", "face" |
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| 25 | }; |
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| 26 | |
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| 27 | PlyProperty vert_props[] = { /* list of property information for a vertex */ |
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| 28 | {"x", PLY_FLOAT, PLY_FLOAT, offsetof(Vertex,x), 0, 0, 0, 0}, |
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| 29 | {"y", PLY_FLOAT, PLY_FLOAT, offsetof(Vertex,y), 0, 0, 0, 0}, |
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| 30 | {"z", PLY_FLOAT, PLY_FLOAT, offsetof(Vertex,z), 0, 0, 0, 0}, |
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| 31 | }; |
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| 32 | |
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| 33 | |
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| 34 | /*** the PLY object ***/ |
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| 35 | |
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| 36 | int nverts; |
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| 37 | Vertex **vlist; |
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| 38 | PlyOtherElems *other_elements = NULL; |
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| 39 | PlyOtherProp *vert_other; |
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| 40 | int nelems; |
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| 41 | char **elist; |
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| 42 | int num_comments; |
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| 43 | char **comments; |
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| 44 | int num_obj_info; |
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| 45 | char **obj_info; |
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| 46 | int file_type; |
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| 47 | |
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| 48 | static float xcenter = 0; |
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| 49 | static float ycenter = 0; |
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| 50 | static float zcenter = 0; |
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| 51 | |
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| 52 | static float box_size = 2; |
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| 53 | |
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| 54 | static int print_only = 0; /* print out info, but don't transform */ |
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| 55 | static int use_mass = 0; /* use center of mass instead of geometric center */ |
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| 56 | |
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| 57 | void usage(char *progname); |
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| 58 | void write_file(); |
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| 59 | void read_file(FILE *inFile); |
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| 60 | void transform(); |
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| 61 | |
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| 62 | |
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| 63 | /****************************************************************************** |
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| 64 | Transform a PLY file. |
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| 65 | ******************************************************************************/ |
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| 66 | |
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| 67 | int |
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| 68 | main(int argc, char *argv[]) |
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| 69 | { |
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| 70 | int i,j; |
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| 71 | char *s; |
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| 72 | char *progname; |
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| 73 | FILE *inFile = stdin; |
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| 74 | |
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| 75 | progname = argv[0]; |
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| 76 | |
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| 77 | /* Parse -flags */ |
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| 78 | while (--argc > 0 && (*++argv)[0]=='-') { |
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| 79 | for (s = argv[0]+1; *s; s++) |
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| 80 | switch (*s) { |
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| 81 | case 'm': |
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| 82 | use_mass = 1 - use_mass; |
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| 83 | break; |
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| 84 | case 'p': |
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| 85 | print_only = 1 - print_only; |
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| 86 | break; |
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| 87 | case 'b': |
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| 88 | if (argc < 2) { |
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| 89 | usage(progname); |
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| 90 | } |
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| 91 | box_size = atof (*++argv); |
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| 92 | argc -= 1; |
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| 93 | break; |
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| 94 | case 'c': |
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| 95 | if (argc < 4) { |
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| 96 | usage(progname); |
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| 97 | } |
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| 98 | xcenter = atof (*++argv); |
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| 99 | ycenter = atof (*++argv); |
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| 100 | zcenter = atof (*++argv); |
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| 101 | argc -= 3; |
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| 102 | break; |
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| 103 | default: |
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| 104 | usage (progname); |
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| 105 | exit (-1); |
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| 106 | break; |
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| 107 | } |
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| 108 | } |
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| 109 | |
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| 110 | /* optional input file (if not, read stdin ) */ |
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| 111 | if (argc > 0 && *argv[0] != '-') { |
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| 112 | inFile = fopen(argv[0], "r"); |
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| 113 | if (inFile == NULL) { |
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| 114 | fprintf(stderr, "Error: Couldn't open input file %s\n", argv[0]); |
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| 115 | usage(progname); |
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| 116 | exit(-1); |
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| 117 | } |
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| 118 | argc --; |
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| 119 | argv ++; |
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| 120 | } |
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| 121 | |
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| 122 | /* Check no extra args */ |
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| 123 | if (argc > 0) { |
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| 124 | fprintf(stderr, "Error: Unhandled arg: %s\n", argv[0]); |
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| 125 | usage(progname); |
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| 126 | exit(-1); |
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| 127 | } |
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| 128 | |
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| 129 | read_file(inFile); |
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| 130 | |
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| 131 | transform(); |
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| 132 | |
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| 133 | if (!print_only) |
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| 134 | write_file(); |
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| 135 | } |
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| 136 | |
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| 137 | |
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| 138 | /****************************************************************************** |
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| 139 | Print out usage information. |
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| 140 | ******************************************************************************/ |
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| 141 | |
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| 142 | void |
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| 143 | usage(char *progname) |
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| 144 | { |
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| 145 | fprintf (stderr, "usage: %s [flags] [in.ply] > out.ply\n", progname); |
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| 146 | fprintf (stderr, " or: %s [flags] < in.ply > out.ply\n", progname); |
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| 147 | fprintf (stderr, " -b box_size (default = 2)\n"); |
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| 148 | fprintf (stderr, " -c xcenter ycenter zcenter (default is origin)\n"); |
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| 149 | fprintf (stderr, " -m (use mass center instead of geometric center)\n"); |
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| 150 | fprintf (stderr, " -p (only print information)\n"); |
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| 151 | exit(-1); |
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| 152 | } |
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| 153 | |
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| 154 | |
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| 155 | /****************************************************************************** |
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| 156 | Transform the PLY object. |
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| 157 | ******************************************************************************/ |
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| 158 | |
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| 159 | void |
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| 160 | transform() |
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| 161 | { |
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| 162 | int i; |
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| 163 | Vertex *vert; |
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| 164 | float xmin,ymin,zmin; |
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| 165 | float xmax,ymax,zmax; |
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| 166 | float xdiff,ydiff,zdiff; |
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| 167 | float diff; |
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| 168 | float scale; |
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| 169 | float xt,yt,zt; |
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| 170 | float xc,yc,zc; |
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| 171 | float xsum,ysum,zsum; |
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| 172 | |
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| 173 | if (nverts == 0) |
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| 174 | return; |
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| 175 | |
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| 176 | vert = vlist[0]; |
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| 177 | |
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| 178 | xmin = vert->x; |
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| 179 | ymin = vert->y; |
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| 180 | zmin = vert->z; |
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| 181 | |
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| 182 | xmax = vert->x; |
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| 183 | ymax = vert->y; |
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| 184 | zmax = vert->z; |
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| 185 | |
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| 186 | xsum = ysum = zsum = 0; |
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| 187 | |
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| 188 | #define MIN(a,b) ((a < b) ? (a) : (b)) |
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| 189 | #define MAX(a,b) ((a > b) ? (a) : (b)) |
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| 190 | |
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| 191 | /* find minimum and maximum extent of vertices */ |
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| 192 | |
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| 193 | for (i = 0; i < nverts; i++) { |
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| 194 | |
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| 195 | vert = vlist[i]; |
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| 196 | |
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| 197 | xmin = MIN (vert->x, xmin); |
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| 198 | ymin = MIN (vert->y, ymin); |
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| 199 | zmin = MIN (vert->z, zmin); |
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| 200 | |
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| 201 | xmax = MAX (vert->x, xmax); |
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| 202 | ymax = MAX (vert->y, ymax); |
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| 203 | zmax = MAX (vert->z, zmax); |
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| 204 | |
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| 205 | xsum += vert->x; |
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| 206 | ysum += vert->y; |
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| 207 | zsum += vert->z; |
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| 208 | } |
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| 209 | |
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| 210 | xdiff = xmax - xmin; |
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| 211 | ydiff = ymax - ymin; |
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| 212 | zdiff = zmax - zmin; |
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| 213 | |
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| 214 | diff = MAX (xdiff, MAX (ydiff, zdiff)); |
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| 215 | scale = box_size / diff; |
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| 216 | |
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| 217 | if (print_only) { |
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| 218 | fprintf (stderr, "\n"); |
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| 219 | fprintf (stderr, "xmin xmax: %g %g\n", xmin, xmax); |
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| 220 | fprintf (stderr, "ymin ymax: %g %g\n", ymin, ymax); |
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| 221 | fprintf (stderr, "zmin zmax: %g %g\n", zmin, zmax); |
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| 222 | fprintf (stderr, "geometric center = %g %g %g\n", |
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| 223 | 0.5 * (xmin + xmax), 0.5 * (ymin + ymax), 0.5 * (zmin + zmax)); |
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| 224 | fprintf (stderr, "center of mass = %g %g %g\n", |
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| 225 | xsum / nverts, ysum / nverts, zsum / nverts); |
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| 226 | fprintf (stderr, "maximum side length = %g\n", diff); |
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| 227 | fprintf (stderr, "\n"); |
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| 228 | return; |
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| 229 | } |
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| 230 | |
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| 231 | /* compute center of object, either geometric or mass center */ |
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| 232 | |
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| 233 | if (use_mass) { |
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| 234 | xc = xsum / nverts; |
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| 235 | yc = ysum / nverts; |
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| 236 | zc = zsum / nverts; |
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| 237 | } |
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| 238 | else { |
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| 239 | xc = 0.5 * (xmin + xmax); |
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| 240 | yc = 0.5 * (ymin + ymax); |
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| 241 | zc = 0.5 * (zmin + zmax); |
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| 242 | } |
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| 243 | |
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| 244 | xt = xcenter - scale * xc; |
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| 245 | yt = ycenter - scale * yc; |
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| 246 | zt = zcenter - scale * zc; |
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| 247 | |
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| 248 | /* scale and translate vertices to fit into bounding box, */ |
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| 249 | /* and also center the object */ |
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| 250 | |
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| 251 | for (i = 0; i < nverts; i++) { |
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| 252 | vert = vlist[i]; |
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| 253 | vert->x = xt + vert->x * scale; |
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| 254 | vert->y = yt + vert->y * scale; |
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| 255 | vert->z = zt + vert->z * scale; |
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| 256 | } |
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| 257 | } |
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| 258 | |
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| 259 | |
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| 260 | /****************************************************************************** |
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| 261 | Read in the PLY file from standard in. |
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| 262 | ******************************************************************************/ |
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| 263 | |
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| 264 | void |
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| 265 | read_file(FILE *inFile) |
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| 266 | { |
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| 267 | int i,j,k; |
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| 268 | PlyFile *ply; |
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| 269 | int nprops; |
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| 270 | int num_elems; |
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| 271 | PlyProperty **plist; |
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| 272 | char *elem_name; |
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| 273 | float version; |
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| 274 | |
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| 275 | |
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| 276 | /*** Read in the original PLY object ***/ |
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| 277 | |
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| 278 | |
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| 279 | ply = ply_read (inFile, &nelems, &elist); |
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| 280 | ply_get_info (ply, &version, &file_type); |
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| 281 | |
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| 282 | for (i = 0; i < nelems; i++) { |
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| 283 | |
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| 284 | /* get the description of the first element */ |
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| 285 | elem_name = elist[i]; |
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| 286 | plist = ply_get_element_description (ply, elem_name, &num_elems, &nprops); |
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| 287 | |
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| 288 | if (equal_strings ("vertex", elem_name)) { |
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| 289 | |
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| 290 | /* create a vertex list to hold all the vertices */ |
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| 291 | vlist = (Vertex **) malloc (sizeof (Vertex *) * num_elems); |
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| 292 | nverts = num_elems; |
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| 293 | |
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| 294 | /* set up for getting vertex elements */ |
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| 295 | |
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| 296 | ply_get_property (ply, elem_name, &vert_props[0]); |
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| 297 | ply_get_property (ply, elem_name, &vert_props[1]); |
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| 298 | ply_get_property (ply, elem_name, &vert_props[2]); |
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| 299 | vert_other = ply_get_other_properties (ply, elem_name, |
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| 300 | offsetof(Vertex,other_props)); |
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| 301 | |
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| 302 | /* grab all the vertex elements */ |
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| 303 | for (j = 0; j < num_elems; j++) { |
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| 304 | vlist[j] = (Vertex *) malloc (sizeof (Vertex)); |
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| 305 | ply_get_element (ply, (void *) vlist[j]); |
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| 306 | } |
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| 307 | } |
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| 308 | else |
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| 309 | other_elements = ply_get_other_element (ply, elem_name, num_elems); |
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| 310 | } |
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| 311 | |
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| 312 | comments = ply_get_comments (ply, &num_comments); |
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| 313 | obj_info = ply_get_obj_info (ply, &num_obj_info); |
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| 314 | |
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| 315 | ply_close (ply); |
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| 316 | } |
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| 317 | |
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| 318 | |
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| 319 | /****************************************************************************** |
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| 320 | Write out the PLY file to standard out. |
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| 321 | ******************************************************************************/ |
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| 322 | |
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| 323 | void |
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| 324 | write_file() |
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| 325 | { |
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| 326 | int i,j,k; |
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| 327 | PlyFile *ply; |
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| 328 | int num_elems; |
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| 329 | char *elem_name; |
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| 330 | |
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| 331 | /*** Write out the transformed PLY object ***/ |
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| 332 | |
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| 333 | |
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| 334 | ply = ply_write (stdout, nelems, elist, file_type); |
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| 335 | |
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| 336 | |
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| 337 | /* describe what properties go into the vertex and face elements */ |
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| 338 | |
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| 339 | ply_element_count (ply, "vertex", nverts); |
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| 340 | ply_describe_property (ply, "vertex", &vert_props[0]); |
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| 341 | ply_describe_property (ply, "vertex", &vert_props[1]); |
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| 342 | ply_describe_property (ply, "vertex", &vert_props[2]); |
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| 343 | ply_describe_other_properties (ply, vert_other, offsetof(Vertex,other_props)); |
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| 344 | |
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| 345 | ply_describe_other_elements (ply, other_elements); |
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| 346 | |
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| 347 | for (i = 0; i < num_comments; i++) |
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| 348 | ply_put_comment (ply, comments[i]); |
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| 349 | |
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| 350 | for (i = 0; i < num_obj_info; i++) |
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| 351 | ply_put_obj_info (ply, obj_info[i]); |
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| 352 | |
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| 353 | ply_header_complete (ply); |
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| 354 | |
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| 355 | /* set up and write the vertex elements */ |
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| 356 | ply_put_element_setup (ply, "vertex"); |
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| 357 | for (i = 0; i < nverts; i++) |
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| 358 | ply_put_element (ply, (void *) vlist[i]); |
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| 359 | |
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| 360 | ply_put_other_elements (ply); |
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| 361 | |
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| 362 | /* close the PLY file */ |
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| 363 | ply_close (ply); |
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| 364 | } |
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| 365 | |
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