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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