1 | /* |
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2 | |
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3 | plyplanecrop: |
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4 | crop away all points in a ply file below a specified plane. |
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5 | |
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6 | Brian Curless, 2005. |
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7 | |
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8 | */ |
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9 | |
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10 | #include <stdio.h> |
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11 | #include <stdlib.h> |
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12 | #include <math.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 | float A,B,C,D; |
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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 | int index; |
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23 | void *other_props; /* other properties */ |
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24 | } Vertex; |
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25 | |
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26 | typedef struct Face { |
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27 | unsigned char nverts; /* number of vertex indices in list */ |
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28 | int *verts; /* vertex index list */ |
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29 | void *other_props; /* other properties */ |
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30 | } Face; |
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31 | |
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32 | char *elem_names[] = { /* list of the kinds of elements in the user's object */ |
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33 | "vertex", "face" |
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34 | }; |
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35 | |
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36 | PlyProperty vert_props[] = { /* list of property information for a vertex */ |
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37 | {"x", PLY_FLOAT, PLY_FLOAT, offsetof(Vertex,x), 0, 0, 0, 0}, |
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38 | {"y", PLY_FLOAT, PLY_FLOAT, offsetof(Vertex,y), 0, 0, 0, 0}, |
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39 | {"z", PLY_FLOAT, PLY_FLOAT, offsetof(Vertex,z), 0, 0, 0, 0}, |
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40 | }; |
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41 | |
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42 | PlyProperty face_props[] = { /* list of property information for a vertex */ |
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43 | {"vertex_indices", PLY_INT, PLY_INT, offsetof(Face,verts), |
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44 | 1, PLY_UCHAR, PLY_UCHAR, offsetof(Face,nverts)}, |
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45 | }; |
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46 | |
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47 | |
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48 | /*** the PLY object ***/ |
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49 | |
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50 | static int nverts,nfaces; |
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51 | static Vertex **vlist; |
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52 | static Face **flist; |
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53 | static PlyOtherElems *other_elements = NULL; |
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54 | static PlyOtherProp *vert_other,*face_other; |
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55 | static int nelems; |
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56 | static char **elist; |
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57 | static int num_comments; |
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58 | static char **comments; |
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59 | static int num_obj_info; |
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60 | static char **obj_info; |
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61 | static int file_type; |
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62 | |
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63 | void usage(char *progname); |
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64 | void read_file(FILE *inFile); |
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65 | void write_file(); |
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66 | |
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67 | |
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68 | /****************************************************************************** |
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69 | Main program. |
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70 | ******************************************************************************/ |
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71 | |
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72 | int |
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73 | main(int argc, char *argv[]) |
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74 | { |
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75 | int i,j; |
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76 | char *s; |
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77 | char *progname; |
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78 | FILE *inFile = stdin; |
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79 | |
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80 | progname = argv[0]; |
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81 | |
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82 | if (argc < 5 || argc > 6) { |
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83 | usage (progname); |
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84 | exit (-1); |
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85 | } |
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86 | |
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87 | A = atof(argv[1]); |
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88 | B = atof(argv[2]); |
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89 | C = atof(argv[3]); |
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90 | D = atof(argv[4]); |
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91 | |
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92 | /* optional input file (if not, read stdin ) */ |
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93 | if (argc == 6) { |
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94 | inFile = fopen(argv[5], "r"); |
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95 | if (inFile == NULL) { |
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96 | fprintf(stderr, "Error: Couldn't open input file %s\n", argv[0]); |
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97 | usage(progname); |
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98 | exit(-1); |
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99 | } |
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100 | } |
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101 | |
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102 | // Read in the file |
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103 | read_file(inFile); |
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104 | |
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105 | // Write back out, ignoring points below the plane |
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106 | write_file(); |
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107 | } |
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108 | |
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109 | |
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110 | /****************************************************************************** |
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111 | Print out usage information. |
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112 | ******************************************************************************/ |
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113 | |
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114 | void |
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115 | usage(char *progname) |
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116 | { |
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117 | fprintf (stderr, "usage: %s <a> <b> <c> <d> [in.ply] > out.ply\n", progname); |
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118 | fprintf (stderr, " or: %s <a> <b> <c> <d> < in.ply > out.ply\n", progname); |
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119 | fprintf (stderr, "\n"); |
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120 | fprintf (stderr, " This program will remove all vertices (and their\n"); |
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121 | fprintf (stderr, " corresponding faces) that are outside the specified\n"); |
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122 | fprintf (stderr, " plane, i.e., vertices where a*x + b*y + c*z + d < 0.\n"); |
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123 | fprintf (stderr, "\n"); |
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124 | exit(-1); |
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125 | } |
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126 | |
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127 | |
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128 | |
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129 | /****************************************************************************** |
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130 | Read in the PLY file from standard in. |
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131 | ******************************************************************************/ |
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132 | |
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133 | void |
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134 | read_file(FILE *inFile) |
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135 | { |
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136 | int i,j,k; |
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137 | PlyFile *ply; |
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138 | int nprops; |
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139 | int num_elems; |
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140 | PlyProperty **plist; |
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141 | char *elem_name; |
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142 | float version; |
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143 | |
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144 | |
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145 | /*** Read in the original PLY object ***/ |
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146 | |
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147 | |
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148 | ply = ply_read (inFile, &nelems, &elist); |
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149 | ply_get_info (ply, &version, &file_type); |
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150 | |
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151 | for (i = 0; i < nelems; i++) { |
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152 | |
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153 | /* get the description of the first element */ |
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154 | elem_name = elist[i]; |
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155 | plist = ply_get_element_description (ply, elem_name, &num_elems, &nprops); |
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156 | |
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157 | if (equal_strings ("vertex", elem_name)) { |
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158 | |
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159 | /* create a vertex list to hold all the vertices */ |
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160 | vlist = (Vertex **) malloc (sizeof (Vertex *) * num_elems); |
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161 | nverts = num_elems; |
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162 | |
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163 | /* set up for getting vertex elements */ |
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164 | |
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165 | ply_get_property (ply, elem_name, &vert_props[0]); |
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166 | ply_get_property (ply, elem_name, &vert_props[1]); |
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167 | ply_get_property (ply, elem_name, &vert_props[2]); |
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168 | vert_other = ply_get_other_properties (ply, elem_name, |
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169 | offsetof(Vertex,other_props)); |
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170 | |
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171 | /* grab all the vertex elements */ |
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172 | for (j = 0; j < num_elems; j++) { |
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173 | vlist[j] = (Vertex *) malloc (sizeof (Vertex)); |
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174 | ply_get_element (ply, (void *) vlist[j]); |
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175 | } |
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176 | } |
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177 | else if (equal_strings ("face", elem_name)) { |
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178 | |
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179 | /* create a list to hold all the face elements */ |
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180 | flist = (Face **) malloc (sizeof (Face *) * num_elems); |
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181 | nfaces = num_elems; |
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182 | |
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183 | /* set up for getting face elements */ |
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184 | |
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185 | ply_get_property (ply, elem_name, &face_props[0]); |
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186 | face_other = ply_get_other_properties (ply, elem_name, |
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187 | offsetof(Face,other_props)); |
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188 | |
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189 | /* grab all the face elements */ |
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190 | for (j = 0; j < num_elems; j++) { |
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191 | flist[j] = (Face *) malloc (sizeof (Face)); |
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192 | ply_get_element (ply, (void *) flist[j]); |
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193 | /* DEBUG |
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194 | fprintf(stderr, "face %d: %d verts: %d %d %d\n", |
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195 | j, flist[j]->nverts, |
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196 | flist[j]->verts[0], |
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197 | flist[j]->verts[1], |
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198 | flist[j]->verts[2]); |
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199 | */ |
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200 | } |
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201 | } |
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202 | else |
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203 | other_elements = ply_get_other_element (ply, elem_name, num_elems); |
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204 | } |
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205 | |
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206 | comments = ply_get_comments (ply, &num_comments); |
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207 | obj_info = ply_get_obj_info (ply, &num_obj_info); |
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208 | |
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209 | ply_close (ply); |
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210 | } |
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211 | |
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212 | |
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213 | /****************************************************************************** |
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214 | Write out the PLY file to standard out. |
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215 | Ignore all the points (and corresponding faces) below |
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216 | the plane. |
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217 | ******************************************************************************/ |
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218 | |
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219 | void |
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220 | write_file() |
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221 | { |
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222 | int i,j,k; |
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223 | PlyFile *ply; |
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224 | int num_elems; |
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225 | char *elem_name; |
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226 | int vert_count; |
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227 | int face_count; |
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228 | |
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229 | /*** Write out the final PLY object ***/ |
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230 | |
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231 | |
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232 | ply = ply_write (stdout, nelems, elist, file_type); |
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233 | |
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234 | // count the vertices that are above the plane |
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235 | vert_count = 0; |
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236 | for (i = 0; i < nverts; i++) { |
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237 | // Set the index to either the index number, or -1... |
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238 | if (A*vlist[i]->x + B*vlist[i]->y + C*vlist[i]->z + D >= 0) { |
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239 | vlist[i]->index = vert_count; |
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240 | vert_count++; |
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241 | } else { |
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242 | vlist[i]->index = -1; |
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243 | } |
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244 | } |
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245 | |
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246 | // count the faces that are still valid |
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247 | face_count = 0; |
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248 | for (i = 0; i < nfaces; i++) { |
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249 | bool valid = (flist[i]->nverts > 0); |
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250 | for (j = 0; j < flist[i]->nverts; j++) { |
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251 | if (vlist[flist[i]->verts[j]]->index == -1) { |
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252 | valid = false; |
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253 | break; |
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254 | } |
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255 | } |
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256 | |
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257 | // If face not valid, set nverts to 0, so it won't |
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258 | // get written out later. |
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259 | if (valid) { |
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260 | face_count++; |
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261 | } else { |
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262 | flist[i]->nverts = 0; |
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263 | } |
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264 | } |
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265 | |
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266 | /* describe what properties go into the vertex and face elements */ |
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267 | |
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268 | ply_element_count (ply, "vertex", vert_count); |
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269 | ply_describe_property (ply, "vertex", &vert_props[0]); |
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270 | ply_describe_property (ply, "vertex", &vert_props[1]); |
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271 | ply_describe_property (ply, "vertex", &vert_props[2]); |
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272 | ply_describe_other_properties (ply, vert_other, offsetof(Vertex,other_props)); |
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273 | ply_element_count (ply, "face", face_count); |
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274 | ply_describe_property (ply, "face", &face_props[0]); |
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275 | ply_describe_other_properties (ply, face_other, offsetof(Face,other_props)); |
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276 | |
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277 | ply_describe_other_elements (ply, other_elements); |
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278 | |
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279 | for (i = 0; i < num_comments; i++) |
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280 | ply_put_comment (ply, comments[i]); |
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281 | |
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282 | for (i = 0; i < num_obj_info; i++) |
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283 | ply_put_obj_info (ply, obj_info[i]); |
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284 | |
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285 | ply_header_complete (ply); |
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286 | |
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287 | /* set up and write the vertex elements */ |
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288 | |
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289 | ply_put_element_setup (ply, "vertex"); |
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290 | |
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291 | for (i = 0; i < nverts; i++) |
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292 | if (vlist[i]->index > -1) |
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293 | ply_put_element (ply, (void *) vlist[i]); |
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294 | |
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295 | /* set up and write the face elements */ |
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296 | ply_put_element_setup (ply, "face"); |
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297 | |
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298 | for (i = 0; i < nfaces; i++) { |
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299 | if (flist[i]->nverts == 0) |
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300 | continue; |
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301 | for (j = 0; j < flist[i]->nverts; j++) |
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302 | flist[i]->verts[j] = (vlist[flist[i]->verts[j]])->index; |
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303 | ply_put_element (ply, (void *) flist[i]); |
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304 | } |
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305 | |
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306 | ply_put_other_elements (ply); |
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307 | |
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308 | /* close the PLY file */ |
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309 | ply_close (ply); |
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310 | } |
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