[37] | 1 | /* |
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| 2 | |
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| 3 | Compute the axis aligned bounding box that fits around the |
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| 4 | vertices within a ply file. |
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| 5 | |
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| 6 | Brian Curless |
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| 7 | June 1995 |
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| 8 | |
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| 9 | Steve Marschner, December 2000 |
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| 10 | Generalized to multiple input files. |
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| 11 | |
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| 12 | */ |
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| 13 | |
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| 14 | |
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| 15 | #include <ply.h> |
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| 16 | #include <stdlib.h> |
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| 17 | #include <strings.h> |
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| 18 | #include <math.h> |
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| 19 | #include <limits.h> |
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| 20 | #include <stdio.h> |
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| 21 | #include <float.h> |
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| 22 | |
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| 23 | #define MAX(a, b) (a) > (b) ? (a) : (b) |
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| 24 | #define MIN(a, b) (a) < (b) ? (a) : (b) |
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| 25 | |
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| 26 | typedef struct Vertex { |
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| 27 | float x, y, z; |
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| 28 | float diff_r, diff_g, diff_b; |
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| 29 | } Vertex; |
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| 30 | |
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| 31 | static char *elem_names[] = { |
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| 32 | "vertex", |
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| 33 | }; |
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| 34 | |
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| 35 | static PlyProperty vert_props[] = { |
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| 36 | {"x", PLY_FLOAT, PLY_FLOAT, 0, 0, PLY_START_TYPE, PLY_START_TYPE, 0}, |
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| 37 | {"y", PLY_FLOAT, PLY_FLOAT, 0, 0, PLY_START_TYPE, PLY_START_TYPE, 0}, |
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| 38 | {"z", PLY_FLOAT, PLY_FLOAT, 0, 0, PLY_START_TYPE, PLY_START_TYPE, 0}, |
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| 39 | }; |
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| 40 | |
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| 41 | typedef struct BBox { |
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| 42 | float minx, miny, minz, maxx, maxy, maxz; |
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| 43 | } BBox; |
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| 44 | |
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| 45 | |
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| 46 | PlyFile *readPlyFile(FILE *inFile, Vertex **pVerts, int *pNumVerts); |
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| 47 | void initbbox(BBox *b); |
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| 48 | void updatebbox(BBox *b, Vertex *verts, int numVerts); |
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| 49 | void printbbox(BBox *b); |
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| 50 | void printUsage(); |
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| 51 | |
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| 52 | |
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| 53 | void |
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| 54 | printusage(char *progname) |
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| 55 | { |
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| 56 | fprintf (stderr, "usage: %s [in.ply ...]\n", progname); |
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| 57 | fprintf (stderr, " or: %s < in.ply\n", progname); |
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| 58 | exit (-1); |
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| 59 | } |
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| 60 | |
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| 61 | |
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| 62 | int |
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| 63 | main(int argc, char**argv) |
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| 64 | { |
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| 65 | Vertex *verts = NULL; |
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| 66 | int numVerts; |
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| 67 | char *s; |
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| 68 | char *progname; |
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| 69 | FILE *inFile = NULL; |
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| 70 | BBox box; |
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| 71 | |
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| 72 | progname = argv[0]; |
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| 73 | |
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| 74 | /* parse -flags */ |
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| 75 | while (--argc > 0 && (*++argv)[0]=='-') { |
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| 76 | for (s = argv[0]+1; *s; s++) |
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| 77 | switch (*s) { |
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| 78 | default: |
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| 79 | printusage(progname); |
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| 80 | break; |
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| 81 | } |
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| 82 | } |
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| 83 | |
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| 84 | initbbox(&box); |
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| 85 | |
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| 86 | /* optional input files (if not, read stdin ) */ |
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| 87 | if (argc > 0) { |
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| 88 | while (argc > 0 && *argv[0] != '-') { |
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| 89 | inFile = fopen(argv[0], "r"); |
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| 90 | if (inFile == NULL) { |
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| 91 | fprintf(stderr, "Error: Couldn't open input file %s\n", argv[0]); |
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| 92 | printusage(progname); |
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| 93 | } |
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| 94 | argc --; |
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| 95 | argv ++; |
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| 96 | |
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| 97 | readPlyFile(inFile, &verts, &numVerts); |
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| 98 | |
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| 99 | if (verts == NULL) { |
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| 100 | fprintf(stderr, "Obtained no vertices from %s.\n", argv[0]); |
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| 101 | exit(1); |
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| 102 | } |
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| 103 | |
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| 104 | updatebbox(&box, verts, numVerts); |
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| 105 | } |
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| 106 | } else { |
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| 107 | readPlyFile(stdin, &verts, &numVerts); |
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| 108 | |
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| 109 | if (verts == NULL) { |
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| 110 | fprintf(stderr, "Obtained no vertices from %s.\n", argv[0]); |
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| 111 | exit(1); |
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| 112 | } |
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| 113 | |
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| 114 | updatebbox(&box, verts, numVerts); |
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| 115 | } |
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| 116 | |
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| 117 | if (argc > 0) { |
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| 118 | fprintf(stderr, "Error: Unhandled arg: %s\n", argv[0]); |
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| 119 | printusage(progname); |
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| 120 | exit(-1); |
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| 121 | } |
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| 122 | |
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| 123 | printbbox(&box); |
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| 124 | |
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| 125 | exit(0); |
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| 126 | } |
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| 127 | |
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| 128 | |
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| 129 | void |
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| 130 | initbbox(BBox *b) |
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| 131 | { |
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| 132 | b->minx = FLT_MAX; |
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| 133 | b->miny = FLT_MAX; |
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| 134 | b->minz = FLT_MAX; |
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| 135 | |
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| 136 | b->maxx = -FLT_MAX; |
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| 137 | b->maxy = -FLT_MAX; |
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| 138 | b->maxz = -FLT_MAX; |
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| 139 | } |
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| 140 | |
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| 141 | |
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| 142 | void |
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| 143 | updatebbox(BBox *b, Vertex *verts, int numVerts) |
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| 144 | { |
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| 145 | int i; |
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| 146 | |
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| 147 | for(i = 0; i < numVerts; i++) { |
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| 148 | b->minx = MIN(b->minx, verts[i].x); |
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| 149 | b->miny = MIN(b->miny, verts[i].y); |
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| 150 | b->minz = MIN(b->minz, verts[i].z); |
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| 151 | |
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| 152 | b->maxx = MAX(b->maxx, verts[i].x); |
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| 153 | b->maxy = MAX(b->maxy, verts[i].y); |
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| 154 | b->maxz = MAX(b->maxz, verts[i].z); |
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| 155 | } |
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| 156 | } |
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| 157 | |
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| 158 | |
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| 159 | void |
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| 160 | printbbox(BBox *b) |
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| 161 | { |
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| 162 | printf("\n"); |
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| 163 | printf("%f %f %f\n", b->minx, b->miny, b->minz); |
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| 164 | printf("%f %f %f\n", b->maxx, b->maxy, b->maxz); |
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| 165 | printf("\n"); |
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| 166 | } |
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| 167 | |
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| 168 | |
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| 169 | |
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| 170 | PlyFile * |
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| 171 | readPlyFile(FILE *inFile, Vertex **pVerts, int *pNumVerts) |
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| 172 | { |
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| 173 | int i, j; |
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| 174 | int nelems, numVerts; |
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| 175 | char **elist; |
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| 176 | int file_type; |
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| 177 | float version; |
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| 178 | char *elem_name; |
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| 179 | int nprops, num_vert_props; |
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| 180 | int num_elems; |
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| 181 | PlyProperty **plist; |
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| 182 | Vertex *verts; |
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| 183 | PlyFile *ply; |
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| 184 | |
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| 185 | vert_props[0].offset = offsetof(Vertex, x); |
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| 186 | vert_props[1].offset = offsetof(Vertex, y); |
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| 187 | vert_props[2].offset = offsetof(Vertex, z); |
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| 188 | num_vert_props = 3; |
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| 189 | |
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| 190 | ply = ply_read (inFile, &nelems, &elist); |
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| 191 | ply_get_info (ply, &version, &file_type); |
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| 192 | |
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| 193 | if (!ply) |
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| 194 | exit(1); |
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| 195 | |
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| 196 | verts = NULL; |
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| 197 | |
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| 198 | for (i = 0; i < nelems; i++) { |
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| 199 | |
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| 200 | /* get the description of the first element */ |
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| 201 | elem_name = elist[i]; |
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| 202 | plist = ply_get_element_description |
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| 203 | (ply, elem_name, &num_elems, &nprops); |
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| 204 | |
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| 205 | /* if we're on vertex elements, read them in */ |
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| 206 | if (equal_strings ("vertex", elem_name)) { |
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| 207 | |
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| 208 | numVerts = *pNumVerts = num_elems; |
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| 209 | verts = (Vertex *)malloc(sizeof(Vertex)*numVerts); |
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| 210 | |
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| 211 | /* set up for getting vertex elements */ |
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| 212 | ply_get_element_setup (ply, elem_name, num_vert_props, vert_props); |
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| 213 | |
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| 214 | /* grab all the vertex elements */ |
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| 215 | for (j = 0; j < numVerts; j++) |
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| 216 | ply_get_element (ply, (void *) &verts[j]); |
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| 217 | } |
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| 218 | } |
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| 219 | |
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| 220 | if (*pVerts) free(*pVerts); |
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| 221 | *pVerts = verts; |
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| 222 | |
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| 223 | return ply; |
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| 224 | } |
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| 225 | |
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| 226 | |
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| 227 | void |
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| 228 | printUsage() |
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| 229 | { |
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| 230 | fprintf(stderr, "\n"); |
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| 231 | fprintf(stderr, "plybbox <ply-file>\n"); |
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| 232 | fprintf(stderr, "\n"); |
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| 233 | fprintf(stderr, " Plybbox prints the min and max x,y,z values of the vertices\n"); |
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| 234 | fprintf(stderr, " in the Ply file. The output is relatively unformated:\n"); |
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| 235 | fprintf(stderr, "\n"); |
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| 236 | fprintf(stderr, " <minx> <miny> <minz>\n"); |
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| 237 | fprintf(stderr, " <maxx> <maxy> <maxz>\n"); |
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| 238 | fprintf(stderr, "\n"); |
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| 239 | } |
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| 240 | |
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