[37] | 1 | /* |
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| 2 | |
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| 3 | Flip the order of vertices in the faces and/or flip the vertex normals. |
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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 <stdlib.h> |
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| 10 | #include <stdio.h> |
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| 11 | #include <math.h> |
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| 12 | #include <malloc.h> |
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| 13 | #include <strings.h> |
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| 14 | #include <ply.h> |
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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 | float nx,ny,nz; |
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| 21 | void *other_props; /* other properties */ |
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| 22 | } Vertex; |
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| 23 | |
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| 24 | typedef struct Face { |
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| 25 | unsigned char nverts; /* number of vertex indices in list */ |
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| 26 | int *verts; /* vertex index list */ |
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| 27 | void *other_props; /* other properties */ |
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| 28 | } Face; |
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| 29 | |
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| 30 | char *elem_names[] = { /* list of the kinds of elements in the user's object */ |
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| 31 | "vertex", "face" |
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| 32 | }; |
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| 33 | |
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| 34 | PlyProperty vert_props[] = { /* list of property information for a vertex */ |
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| 35 | {"x", PLY_FLOAT, PLY_FLOAT, offsetof(Vertex,x), 0, 0, 0, 0}, |
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| 36 | {"y", PLY_FLOAT, PLY_FLOAT, offsetof(Vertex,y), 0, 0, 0, 0}, |
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| 37 | {"z", PLY_FLOAT, PLY_FLOAT, offsetof(Vertex,z), 0, 0, 0, 0}, |
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| 38 | {"nx", PLY_FLOAT, PLY_FLOAT, offsetof(Vertex,nx), 0, 0, 0, 0}, |
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| 39 | {"ny", PLY_FLOAT, PLY_FLOAT, offsetof(Vertex,ny), 0, 0, 0, 0}, |
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| 40 | {"nz", PLY_FLOAT, PLY_FLOAT, offsetof(Vertex,nz), 0, 0, 0, 0}, |
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| 41 | }; |
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| 42 | |
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| 43 | PlyProperty face_props[] = { /* list of property information for a vertex */ |
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| 44 | {"vertex_indices", PLY_INT, PLY_INT, offsetof(Face,verts), |
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| 45 | 1, PLY_UCHAR, PLY_UCHAR, offsetof(Face,nverts)}, |
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| 46 | }; |
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| 47 | |
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| 48 | |
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| 49 | /*** the PLY object ***/ |
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| 50 | |
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| 51 | static int nverts,nfaces; |
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| 52 | static Vertex **vlist; |
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| 53 | static Face **flist; |
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| 54 | static PlyOtherElems *other_elements = NULL; |
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| 55 | static PlyOtherProp *vert_other,*face_other; |
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| 56 | static int nelems; |
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| 57 | static char **elist; |
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| 58 | static int num_comments; |
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| 59 | static char **comments; |
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| 60 | static int num_obj_info; |
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| 61 | static char **obj_info; |
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| 62 | static int file_type; |
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| 63 | |
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| 64 | static int flip_order = 1; /* flip order of vertices around the faces? */ |
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| 65 | static int flip_normals = 0; /* flip vertex normals? */ |
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| 66 | static int has_nx,has_ny,has_nz; /* are normals in PLY file? */ |
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| 67 | |
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| 68 | void usage(char *progname); |
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| 69 | void write_file(); |
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| 70 | void read_file(FILE *inFile); |
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| 71 | void negate_normals(); |
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| 72 | void flip_vertex_order(); |
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| 73 | |
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| 74 | |
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| 75 | /****************************************************************************** |
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| 76 | Main program. |
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| 77 | ******************************************************************************/ |
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| 78 | |
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| 79 | int |
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| 80 | main(int argc, char *argv[]) |
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| 81 | { |
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| 82 | int i,j; |
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| 83 | char *s; |
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| 84 | char *progname; |
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| 85 | FILE *inFile = stdin; |
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| 86 | |
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| 87 | progname = argv[0]; |
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| 88 | |
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| 89 | /* Parse -flags */ |
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| 90 | while (--argc > 0 && (*++argv)[0]=='-') { |
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| 91 | for (s = argv[0]+1; *s; s++) |
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| 92 | switch (*s) { |
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| 93 | case 'n': |
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| 94 | flip_normals = 1; |
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| 95 | flip_order = 0; |
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| 96 | break; |
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| 97 | case 'b': |
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| 98 | flip_normals = 1; |
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| 99 | flip_order = 1; |
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| 100 | break; |
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| 101 | default: |
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| 102 | usage (progname); |
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| 103 | exit (-1); |
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| 104 | break; |
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| 105 | } |
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| 106 | } |
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| 107 | |
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| 108 | |
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| 109 | /* optional input file (if not, read stdin ) */ |
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| 110 | if (argc > 0 && *argv[0] != '-') { |
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| 111 | inFile = fopen(argv[0], "r"); |
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| 112 | if (inFile == NULL) { |
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| 113 | fprintf(stderr, "Error: Couldn't open input file %s\n", argv[0]); |
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| 114 | usage(progname); |
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| 115 | exit(-1); |
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| 116 | } |
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| 117 | argc --; |
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| 118 | argv ++; |
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| 119 | } |
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| 120 | |
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| 121 | /* Check no extra args */ |
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| 122 | if (argc > 0) { |
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| 123 | fprintf(stderr, "Error: Unhandled arg: %s\n", argv[0]); |
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| 124 | usage(progname); |
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| 125 | exit(-1); |
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| 126 | } |
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| 127 | |
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| 128 | read_file(inFile); |
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| 129 | |
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| 130 | /* maybe flip the order of the vertices in each face */ |
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| 131 | if (flip_order) |
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| 132 | flip_vertex_order(); |
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| 133 | |
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| 134 | /* maybe flip the vertex normals */ |
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| 135 | if (flip_normals) |
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| 136 | negate_normals(); |
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| 137 | |
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| 138 | write_file(); |
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| 139 | } |
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| 140 | |
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| 141 | |
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| 142 | /****************************************************************************** |
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| 143 | Print out usage information. |
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| 144 | ******************************************************************************/ |
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| 145 | |
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| 146 | void |
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| 147 | usage(char *progname) |
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| 148 | { |
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| 149 | fprintf (stderr, "usage: %s [flags] [in.ply] > out.ply\n", progname); |
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| 150 | fprintf (stderr, " or: %s [flags] < in.ply > out.ply\n", progname); |
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| 151 | fprintf (stderr, " -n (flip normals)\n"); |
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| 152 | fprintf (stderr, " -b (flip both normals and vertex order in faces)\n"); |
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| 153 | } |
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| 154 | |
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| 155 | |
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| 156 | /****************************************************************************** |
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| 157 | Reverse the order of the vertices in each face. |
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| 158 | ******************************************************************************/ |
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| 159 | |
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| 160 | void |
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| 161 | flip_vertex_order() |
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| 162 | { |
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| 163 | int i,j; |
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| 164 | int temp; |
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| 165 | int num; |
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| 166 | Face *face; |
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| 167 | |
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| 168 | for (i = 0; i < nfaces; i++) { |
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| 169 | |
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| 170 | face = flist[i]; |
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| 171 | num = face->nverts; |
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| 172 | |
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| 173 | /* swap early vertices with later ones */ |
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| 174 | for (j = 0; j < num / 2; j++) { |
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| 175 | temp = face->verts[j]; |
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| 176 | face->verts[j] = face->verts[num-j-1]; |
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| 177 | face->verts[num-j-1] = temp; |
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| 178 | } |
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| 179 | } |
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| 180 | } |
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| 181 | |
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| 182 | |
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| 183 | /****************************************************************************** |
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| 184 | Negate the vertex normals. |
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| 185 | ******************************************************************************/ |
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| 186 | |
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| 187 | void |
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| 188 | negate_normals() |
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| 189 | { |
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| 190 | int i; |
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| 191 | |
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| 192 | for (i = 0; i < nverts; i++) { |
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| 193 | if (has_nx) vlist[i]->nx *= -1; |
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| 194 | if (has_ny) vlist[i]->ny *= -1; |
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| 195 | if (has_nz) vlist[i]->nz *= -1; |
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| 196 | } |
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| 197 | } |
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| 198 | |
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| 199 | |
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| 200 | /****************************************************************************** |
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| 201 | Read in the PLY file from standard in. |
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| 202 | ******************************************************************************/ |
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| 203 | |
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| 204 | void |
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| 205 | read_file(FILE *inFile) |
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| 206 | { |
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| 207 | int i,j,k; |
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| 208 | PlyFile *ply; |
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| 209 | int nprops; |
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| 210 | int num_elems; |
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| 211 | PlyProperty **plist; |
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| 212 | char *elem_name; |
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| 213 | float version; |
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| 214 | |
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| 215 | |
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| 216 | /*** Read in the original PLY object ***/ |
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| 217 | |
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| 218 | |
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| 219 | ply = ply_read (inFile, &nelems, &elist); |
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| 220 | ply_get_info (ply, &version, &file_type); |
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| 221 | |
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| 222 | for (i = 0; i < nelems; i++) { |
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| 223 | |
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| 224 | /* get the description of the first element */ |
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| 225 | elem_name = elist[i]; |
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| 226 | plist = ply_get_element_description (ply, elem_name, &num_elems, &nprops); |
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| 227 | |
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| 228 | if (equal_strings ("vertex", elem_name)) { |
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| 229 | |
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| 230 | /* see if vertex holds any normal information */ |
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| 231 | has_nx = has_ny = has_nz = 0; |
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| 232 | for (j = 0; j < nprops; j++) { |
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| 233 | if (equal_strings ("nx", plist[j]->name)) has_nx = 1; |
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| 234 | if (equal_strings ("ny", plist[j]->name)) has_ny = 1; |
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| 235 | if (equal_strings ("nz", plist[j]->name)) has_nz = 1; |
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| 236 | } |
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| 237 | |
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| 238 | /* create a vertex list to hold all the vertices */ |
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| 239 | vlist = (Vertex **) malloc (sizeof (Vertex *) * num_elems); |
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| 240 | nverts = num_elems; |
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| 241 | |
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| 242 | /* set up for getting vertex elements */ |
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| 243 | |
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| 244 | ply_get_property (ply, elem_name, &vert_props[0]); |
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| 245 | ply_get_property (ply, elem_name, &vert_props[1]); |
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| 246 | ply_get_property (ply, elem_name, &vert_props[2]); |
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| 247 | if (has_nx) ply_get_property (ply, elem_name, &vert_props[3]); |
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| 248 | if (has_ny) ply_get_property (ply, elem_name, &vert_props[4]); |
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| 249 | if (has_nz) ply_get_property (ply, elem_name, &vert_props[5]); |
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| 250 | vert_other = ply_get_other_properties (ply, elem_name, |
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| 251 | offsetof(Vertex,other_props)); |
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| 252 | |
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| 253 | /* grab all the vertex elements */ |
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| 254 | for (j = 0; j < num_elems; j++) { |
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| 255 | vlist[j] = (Vertex *) malloc (sizeof (Vertex)); |
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| 256 | ply_get_element (ply, (void *) vlist[j]); |
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| 257 | } |
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| 258 | } |
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| 259 | else if (equal_strings ("face", elem_name)) { |
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| 260 | |
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| 261 | /* create a list to hold all the face elements */ |
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| 262 | flist = (Face **) malloc (sizeof (Face *) * num_elems); |
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| 263 | nfaces = num_elems; |
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| 264 | |
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| 265 | /* set up for getting face elements */ |
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| 266 | |
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| 267 | ply_get_property (ply, elem_name, &face_props[0]); |
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| 268 | face_other = ply_get_other_properties (ply, elem_name, |
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| 269 | offsetof(Face,other_props)); |
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| 270 | |
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| 271 | /* grab all the face elements */ |
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| 272 | for (j = 0; j < num_elems; j++) { |
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| 273 | flist[j] = (Face *) malloc (sizeof (Face)); |
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| 274 | ply_get_element (ply, (void *) flist[j]); |
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| 275 | } |
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| 276 | } |
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| 277 | else |
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| 278 | other_elements = ply_get_other_element (ply, elem_name, num_elems); |
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| 279 | } |
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| 280 | |
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| 281 | comments = ply_get_comments (ply, &num_comments); |
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| 282 | obj_info = ply_get_obj_info (ply, &num_obj_info); |
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| 283 | |
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| 284 | ply_close (ply); |
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| 285 | } |
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| 286 | |
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| 287 | |
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| 288 | /****************************************************************************** |
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| 289 | Write out the PLY file to standard out. |
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| 290 | ******************************************************************************/ |
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| 291 | |
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| 292 | void |
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| 293 | write_file() |
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| 294 | { |
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| 295 | int i,j,k; |
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| 296 | PlyFile *ply; |
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| 297 | int num_elems; |
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| 298 | char *elem_name; |
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| 299 | |
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| 300 | /*** Write out the final PLY object ***/ |
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| 301 | |
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| 302 | |
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| 303 | ply = ply_write (stdout, nelems, elist, file_type); |
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| 304 | |
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| 305 | |
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| 306 | /* describe what properties go into the vertex and face elements */ |
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| 307 | |
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| 308 | ply_element_count (ply, "vertex", nverts); |
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| 309 | ply_describe_property (ply, "vertex", &vert_props[0]); |
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| 310 | ply_describe_property (ply, "vertex", &vert_props[1]); |
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| 311 | ply_describe_property (ply, "vertex", &vert_props[2]); |
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| 312 | if (has_nx) ply_describe_property (ply, "vertex", &vert_props[3]); |
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| 313 | if (has_ny) ply_describe_property (ply, "vertex", &vert_props[4]); |
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| 314 | if (has_nz) ply_describe_property (ply, "vertex", &vert_props[5]); |
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| 315 | ply_describe_other_properties (ply, vert_other, offsetof(Vertex,other_props)); |
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| 316 | |
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| 317 | ply_element_count (ply, "face", nfaces); |
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| 318 | ply_describe_property (ply, "face", &face_props[0]); |
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| 319 | ply_describe_other_properties (ply, face_other, offsetof(Face,other_props)); |
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| 320 | |
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| 321 | ply_describe_other_elements (ply, other_elements); |
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| 322 | |
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| 323 | for (i = 0; i < num_comments; i++) |
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| 324 | ply_put_comment (ply, comments[i]); |
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| 325 | |
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| 326 | for (i = 0; i < num_obj_info; i++) |
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| 327 | ply_put_obj_info (ply, obj_info[i]); |
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| 328 | |
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| 329 | ply_header_complete (ply); |
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| 330 | |
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| 331 | /* set up and write the vertex elements */ |
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| 332 | ply_put_element_setup (ply, "vertex"); |
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| 333 | for (i = 0; i < nverts; i++) |
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| 334 | ply_put_element (ply, (void *) vlist[i]); |
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| 335 | |
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| 336 | /* set up and write the face elements */ |
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| 337 | ply_put_element_setup (ply, "face"); |
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| 338 | for (i = 0; i < nfaces; i++) |
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| 339 | ply_put_element (ply, (void *) flist[i]); |
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| 340 | |
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| 341 | ply_put_other_elements (ply); |
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| 342 | |
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| 343 | /* close the PLY file */ |
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| 344 | ply_close (ply); |
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| 345 | } |
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| 346 | |
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