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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