1 | /* |
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2 | |
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3 | plyconfcrop: |
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4 | crop away all points in a ply file with a confidence below the |
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5 | specified threshold. |
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6 | |
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7 | Lucas Pereira, 1999. |
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8 | |
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9 | */ |
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10 | |
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11 | #include <stdio.h> |
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12 | #include <stdlib.h> |
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13 | #include <math.h> |
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14 | #include <strings.h> |
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15 | #include <ply.h> |
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16 | |
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17 | |
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18 | /* user's vertex and face definitions for a polygonal object */ |
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19 | |
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20 | typedef struct Vertex { |
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21 | float x,y,z; |
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22 | float confidence; |
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23 | int index; |
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24 | void *other_props; /* other properties */ |
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25 | } Vertex; |
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26 | |
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27 | typedef struct Face { |
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28 | unsigned char nverts; /* number of vertex indices in list */ |
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29 | int *verts; /* vertex index list */ |
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30 | void *other_props; /* other properties */ |
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31 | } Face; |
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32 | |
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33 | char *elem_names[] = { /* list of the kinds of elements in the user's object */ |
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34 | "vertex", "face" |
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35 | }; |
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36 | |
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37 | PlyProperty vert_props[] = { /* list of property information for a vertex */ |
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38 | {"x", PLY_FLOAT, PLY_FLOAT, offsetof(Vertex,x), 0, 0, 0, 0}, |
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39 | {"y", PLY_FLOAT, PLY_FLOAT, offsetof(Vertex,y), 0, 0, 0, 0}, |
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40 | {"z", PLY_FLOAT, PLY_FLOAT, offsetof(Vertex,z), 0, 0, 0, 0}, |
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41 | {"confidence", PLY_FLOAT, PLY_FLOAT, offsetof(Vertex,confidence), 0, 0, 0, 0}, |
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42 | }; |
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43 | |
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44 | PlyProperty face_props[] = { /* list of property information for a vertex */ |
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45 | {"vertex_indices", PLY_INT, PLY_INT, offsetof(Face,verts), |
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46 | 1, PLY_UCHAR, PLY_UCHAR, offsetof(Face,nverts)}, |
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47 | }; |
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48 | |
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49 | |
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50 | /*** the PLY object ***/ |
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51 | |
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52 | static int nverts,nfaces; |
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53 | static Vertex **vlist; |
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54 | static Face **flist; |
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55 | static PlyOtherElems *other_elements = NULL; |
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56 | static PlyOtherProp *vert_other,*face_other; |
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57 | static int nelems; |
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58 | static char **elist; |
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59 | static int num_comments; |
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60 | static char **comments; |
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61 | static int num_obj_info; |
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62 | static char **obj_info; |
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63 | static int file_type; |
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64 | static float CONF_THRESH = 0.0; |
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65 | |
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66 | void usage(char *progname); |
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67 | void read_file(FILE *inFile); |
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68 | void write_file(); |
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69 | |
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70 | |
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71 | /****************************************************************************** |
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72 | Main program. |
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73 | ******************************************************************************/ |
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74 | |
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75 | int |
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76 | main(int argc, char *argv[]) |
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77 | { |
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78 | int i,j; |
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79 | char *s; |
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80 | char *progname; |
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81 | FILE *inFile = stdin; |
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82 | |
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83 | progname = argv[0]; |
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84 | |
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85 | /* Parse -flags */ |
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86 | while (--argc > 0 && (*++argv)[0]=='-') { |
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87 | for (s = argv[0]+1; *s; s++) |
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88 | switch (*s) { |
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89 | case 'c': |
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90 | if (argc < 2) { |
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91 | usage(progname); |
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92 | } |
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93 | CONF_THRESH = atof(*++argv); |
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94 | argc -= 1; |
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95 | break; |
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96 | default: |
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97 | usage (progname); |
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98 | exit (-1); |
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99 | break; |
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100 | } |
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101 | } |
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102 | |
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103 | /* optional input file (if not, read stdin ) */ |
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104 | if (argc > 0 && *argv[0] != '-') { |
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105 | inFile = fopen(argv[0], "r"); |
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106 | if (inFile == NULL) { |
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107 | fprintf(stderr, "Error: Couldn't open input file %s\n", argv[0]); |
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108 | usage(progname); |
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109 | exit(-1); |
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110 | } |
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111 | argc --; |
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112 | argv ++; |
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113 | } |
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114 | |
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115 | /* Check no extra args */ |
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116 | if (argc > 0) { |
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117 | fprintf(stderr, "Error: Unhandled arg: %s\n", argv[0]); |
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118 | usage(progname); |
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119 | exit(-1); |
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120 | } |
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121 | |
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122 | // Read in the file |
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123 | read_file(inFile); |
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124 | |
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125 | // Write back out, ignoring points with confidence below |
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126 | // threshold. |
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127 | write_file(); |
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128 | } |
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129 | |
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130 | |
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131 | /****************************************************************************** |
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132 | Print out usage information. |
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133 | ******************************************************************************/ |
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134 | |
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135 | void |
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136 | usage(char *progname) |
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137 | { |
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138 | fprintf (stderr, "usage: %s [flags] [in.ply] > out.ply\n", progname); |
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139 | fprintf (stderr, " or: %s [flags] < in.ply > out.ply\n", progname); |
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140 | fprintf (stderr, " -c confidence_threshold (default = %g)\n", |
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141 | CONF_THRESH); |
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142 | fprintf (stderr, "\n"); |
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143 | fprintf (stderr, " This program will remove all vertices (and their\n"); |
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144 | fprintf (stderr, " corresponding faces) that have a confidence at or \n"); |
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145 | fprintf (stderr, " below the cutoff threshold. By default, it removes\n"); |
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146 | fprintf (stderr, " vertices with confidence 0.\n"); |
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147 | fprintf (stderr, "\n"); |
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148 | exit(-1); |
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149 | } |
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150 | |
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151 | |
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152 | |
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153 | /****************************************************************************** |
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154 | Read in the PLY file from standard in. |
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155 | ******************************************************************************/ |
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156 | |
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157 | void |
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158 | read_file(FILE *inFile) |
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159 | { |
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160 | int i,j,k; |
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161 | PlyFile *ply; |
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162 | int nprops; |
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163 | int num_elems; |
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164 | PlyProperty **plist; |
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165 | char *elem_name; |
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166 | float version; |
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167 | |
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168 | |
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169 | /*** Read in the original PLY object ***/ |
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170 | |
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171 | |
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172 | ply = ply_read (inFile, &nelems, &elist); |
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173 | ply_get_info (ply, &version, &file_type); |
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174 | |
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175 | for (i = 0; i < nelems; i++) { |
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176 | |
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177 | /* get the description of the first element */ |
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178 | elem_name = elist[i]; |
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179 | plist = ply_get_element_description (ply, elem_name, &num_elems, &nprops); |
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180 | |
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181 | if (equal_strings ("vertex", elem_name)) { |
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182 | |
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183 | /* create a vertex list to hold all the vertices */ |
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184 | vlist = (Vertex **) malloc (sizeof (Vertex *) * num_elems); |
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185 | nverts = num_elems; |
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186 | |
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187 | /* set up for getting vertex elements */ |
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188 | |
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189 | ply_get_property (ply, elem_name, &vert_props[0]); |
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190 | ply_get_property (ply, elem_name, &vert_props[1]); |
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191 | ply_get_property (ply, elem_name, &vert_props[2]); |
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192 | ply_get_property (ply, elem_name, &vert_props[3]); |
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193 | vert_other = ply_get_other_properties (ply, elem_name, |
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194 | offsetof(Vertex,other_props)); |
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195 | |
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196 | /* grab all the vertex elements */ |
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197 | for (j = 0; j < num_elems; j++) { |
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198 | vlist[j] = (Vertex *) malloc (sizeof (Vertex)); |
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199 | ply_get_element (ply, (void *) vlist[j]); |
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200 | } |
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201 | } |
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202 | else if (equal_strings ("face", elem_name)) { |
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203 | |
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204 | /* create a list to hold all the face elements */ |
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205 | flist = (Face **) malloc (sizeof (Face *) * num_elems); |
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206 | nfaces = num_elems; |
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207 | |
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208 | /* set up for getting face elements */ |
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209 | |
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210 | ply_get_property (ply, elem_name, &face_props[0]); |
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211 | face_other = ply_get_other_properties (ply, elem_name, |
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212 | offsetof(Face,other_props)); |
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213 | |
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214 | /* grab all the face elements */ |
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215 | for (j = 0; j < num_elems; j++) { |
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216 | flist[j] = (Face *) malloc (sizeof (Face)); |
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217 | ply_get_element (ply, (void *) flist[j]); |
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218 | /* DEBUG |
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219 | fprintf(stderr, "face %d: %d verts: %d %d %d\n", |
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220 | j, flist[j]->nverts, |
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221 | flist[j]->verts[0], |
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222 | flist[j]->verts[1], |
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223 | flist[j]->verts[2]); |
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224 | */ |
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225 | } |
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226 | } |
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227 | else |
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228 | other_elements = ply_get_other_element (ply, elem_name, num_elems); |
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229 | } |
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230 | |
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231 | comments = ply_get_comments (ply, &num_comments); |
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232 | obj_info = ply_get_obj_info (ply, &num_obj_info); |
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233 | |
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234 | ply_close (ply); |
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235 | } |
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236 | |
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237 | |
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238 | /****************************************************************************** |
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239 | Write out the PLY file to standard out. |
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240 | Ignore all the points (and corresponding faces) that have confidence |
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241 | below the specified threshold.... |
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242 | ******************************************************************************/ |
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243 | |
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244 | void |
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245 | write_file() |
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246 | { |
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247 | int i,j,k; |
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248 | PlyFile *ply; |
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249 | int num_elems; |
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250 | char *elem_name; |
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251 | int vert_count; |
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252 | int face_count; |
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253 | |
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254 | /*** Write out the final PLY object ***/ |
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255 | |
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256 | |
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257 | ply = ply_write (stdout, nelems, elist, file_type); |
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258 | |
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259 | // count the vertices that have valid confidence |
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260 | vert_count = 0; |
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261 | for (i = 0; i < nverts; i++) { |
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262 | // Set the index to either the index number, or -1... |
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263 | if (vlist[i]->confidence > CONF_THRESH) { |
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264 | vlist[i]->index = vert_count; |
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265 | vert_count++; |
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266 | } else { |
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267 | vlist[i]->index = -1; |
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268 | } |
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269 | } |
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270 | |
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271 | // count the faces that are still valid |
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272 | face_count = 0; |
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273 | for (i = 0; i < nfaces; i++) { |
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274 | bool valid = (flist[i]->nverts > 0); |
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275 | for (j = 0; j < flist[i]->nverts; j++) { |
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276 | if (vlist[flist[i]->verts[j]]->index == -1) { |
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277 | valid = false; |
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278 | break; |
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279 | } |
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280 | } |
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281 | |
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282 | // If face not valid, set nverts to 0, so it won't |
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283 | // get written out later. |
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284 | if (valid) { |
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285 | face_count++; |
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286 | } else { |
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287 | flist[i]->nverts = 0; |
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288 | } |
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289 | } |
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290 | |
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291 | /* describe what properties go into the vertex and face elements */ |
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292 | |
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293 | ply_element_count (ply, "vertex", vert_count); |
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294 | ply_describe_property (ply, "vertex", &vert_props[0]); |
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295 | ply_describe_property (ply, "vertex", &vert_props[1]); |
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296 | ply_describe_property (ply, "vertex", &vert_props[2]); |
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297 | ply_describe_other_properties (ply, vert_other, offsetof(Vertex,other_props)); |
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298 | ply_describe_property (ply, "vertex", &vert_props[3]); |
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299 | |
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300 | ply_element_count (ply, "face", face_count); |
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301 | ply_describe_property (ply, "face", &face_props[0]); |
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302 | ply_describe_other_properties (ply, face_other, offsetof(Face,other_props)); |
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303 | |
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304 | ply_describe_other_elements (ply, other_elements); |
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305 | |
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306 | for (i = 0; i < num_comments; i++) |
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307 | ply_put_comment (ply, comments[i]); |
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308 | |
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309 | for (i = 0; i < num_obj_info; i++) |
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310 | ply_put_obj_info (ply, obj_info[i]); |
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311 | |
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312 | ply_header_complete (ply); |
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313 | |
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314 | /* set up and write the vertex elements */ |
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315 | |
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316 | ply_put_element_setup (ply, "vertex"); |
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317 | |
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318 | for (i = 0; i < nverts; i++) |
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319 | if (vlist[i]->index > -1) |
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320 | ply_put_element (ply, (void *) vlist[i]); |
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321 | |
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322 | /* set up and write the face elements */ |
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323 | ply_put_element_setup (ply, "face"); |
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324 | |
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325 | for (i = 0; i < nfaces; i++) { |
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326 | if (flist[i]->nverts == 0) |
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327 | continue; |
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328 | for (j = 0; j < flist[i]->nverts; j++) |
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329 | flist[i]->verts[j] = (vlist[flist[i]->verts[j]])->index; |
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330 | ply_put_element (ply, (void *) flist[i]); |
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331 | } |
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332 | |
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333 | ply_put_other_elements (ply); |
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334 | |
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335 | /* close the PLY file */ |
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336 | ply_close (ply); |
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337 | } |
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