1 | /* |
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2 | |
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3 | Flip the order of vertices in the faces and/or flip the vertex normals. |
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4 | |
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5 | Greg Turk, August 1994 |
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6 | |
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7 | */ |
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8 | |
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9 | #include <stdlib.h> |
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10 | #include <stdio.h> |
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11 | #include <math.h> |
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12 | #include <malloc.h> |
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13 | #include <strings.h> |
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14 | #include <ply.h> |
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15 | |
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16 | /* user's vertex and face definitions for a polygonal object */ |
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17 | |
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18 | typedef struct Vertex { |
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19 | float x,y,z; |
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20 | float nx,ny,nz; |
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21 | void *other_props; /* other properties */ |
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22 | } Vertex; |
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23 | |
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24 | typedef struct Face { |
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25 | unsigned char nverts; /* number of vertex indices in list */ |
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26 | int *verts; /* vertex index list */ |
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27 | void *other_props; /* other properties */ |
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28 | } Face; |
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29 | |
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30 | char *elem_names[] = { /* list of the kinds of elements in the user's object */ |
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31 | "vertex", "face" |
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32 | }; |
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33 | |
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34 | PlyProperty vert_props[] = { /* list of property information for a vertex */ |
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35 | {"x", PLY_FLOAT, PLY_FLOAT, offsetof(Vertex,x), 0, 0, 0, 0}, |
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36 | {"y", PLY_FLOAT, PLY_FLOAT, offsetof(Vertex,y), 0, 0, 0, 0}, |
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37 | {"z", PLY_FLOAT, PLY_FLOAT, offsetof(Vertex,z), 0, 0, 0, 0}, |
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38 | {"nx", PLY_FLOAT, PLY_FLOAT, offsetof(Vertex,nx), 0, 0, 0, 0}, |
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39 | {"ny", PLY_FLOAT, PLY_FLOAT, offsetof(Vertex,ny), 0, 0, 0, 0}, |
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40 | {"nz", PLY_FLOAT, PLY_FLOAT, offsetof(Vertex,nz), 0, 0, 0, 0}, |
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41 | }; |
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42 | |
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43 | PlyProperty face_props[] = { /* list of property information for a vertex */ |
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44 | {"vertex_indices", PLY_INT, PLY_INT, offsetof(Face,verts), |
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45 | 1, PLY_UCHAR, PLY_UCHAR, offsetof(Face,nverts)}, |
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46 | }; |
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47 | |
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48 | |
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49 | /*** the PLY object ***/ |
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50 | |
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51 | static int nverts,nfaces; |
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52 | static Vertex **vlist; |
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53 | static Face **flist; |
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54 | static PlyOtherElems *other_elements = NULL; |
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55 | static PlyOtherProp *vert_other,*face_other; |
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56 | static int nelems; |
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57 | static char **elist; |
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58 | static int num_comments; |
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59 | static char **comments; |
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60 | static int num_obj_info; |
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61 | static char **obj_info; |
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62 | static int file_type; |
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63 | |
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64 | static int flip_order = 1; /* flip order of vertices around the faces? */ |
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65 | static int flip_normals = 0; /* flip vertex normals? */ |
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66 | static int has_nx,has_ny,has_nz; /* are normals in PLY file? */ |
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67 | |
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68 | void usage(char *progname); |
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69 | void write_file(); |
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70 | void read_file(FILE *inFile); |
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71 | void negate_normals(); |
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72 | void flip_vertex_order(); |
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73 | |
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74 | |
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75 | /****************************************************************************** |
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76 | Main program. |
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77 | ******************************************************************************/ |
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78 | |
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79 | int |
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80 | main(int argc, char *argv[]) |
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81 | { |
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82 | int i,j; |
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83 | char *s; |
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84 | char *progname; |
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85 | FILE *inFile = stdin; |
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86 | |
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87 | progname = argv[0]; |
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88 | |
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89 | /* Parse -flags */ |
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90 | while (--argc > 0 && (*++argv)[0]=='-') { |
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91 | for (s = argv[0]+1; *s; s++) |
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92 | switch (*s) { |
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93 | case 'n': |
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94 | flip_normals = 1; |
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95 | flip_order = 0; |
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96 | break; |
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97 | case 'b': |
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98 | flip_normals = 1; |
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99 | flip_order = 1; |
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100 | break; |
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101 | default: |
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102 | usage (progname); |
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103 | exit (-1); |
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104 | break; |
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105 | } |
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106 | } |
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107 | |
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108 | |
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109 | /* optional input file (if not, read stdin ) */ |
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110 | if (argc > 0 && *argv[0] != '-') { |
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111 | inFile = fopen(argv[0], "r"); |
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112 | if (inFile == NULL) { |
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113 | fprintf(stderr, "Error: Couldn't open input file %s\n", argv[0]); |
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114 | usage(progname); |
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115 | exit(-1); |
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116 | } |
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117 | argc --; |
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118 | argv ++; |
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119 | } |
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120 | |
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121 | /* Check no extra args */ |
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122 | if (argc > 0) { |
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123 | fprintf(stderr, "Error: Unhandled arg: %s\n", argv[0]); |
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124 | usage(progname); |
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125 | exit(-1); |
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126 | } |
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127 | |
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128 | read_file(inFile); |
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129 | |
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130 | /* maybe flip the order of the vertices in each face */ |
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131 | if (flip_order) |
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132 | flip_vertex_order(); |
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133 | |
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134 | /* maybe flip the vertex normals */ |
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135 | if (flip_normals) |
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136 | negate_normals(); |
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137 | |
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138 | write_file(); |
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139 | } |
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140 | |
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141 | |
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142 | /****************************************************************************** |
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143 | Print out usage information. |
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144 | ******************************************************************************/ |
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145 | |
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146 | void |
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147 | usage(char *progname) |
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148 | { |
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149 | fprintf (stderr, "usage: %s [flags] [in.ply] > out.ply\n", progname); |
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150 | fprintf (stderr, " or: %s [flags] < in.ply > out.ply\n", progname); |
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151 | fprintf (stderr, " -n (flip normals)\n"); |
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152 | fprintf (stderr, " -b (flip both normals and vertex order in faces)\n"); |
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153 | } |
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154 | |
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155 | |
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156 | /****************************************************************************** |
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157 | Reverse the order of the vertices in each face. |
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158 | ******************************************************************************/ |
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159 | |
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160 | void |
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161 | flip_vertex_order() |
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162 | { |
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163 | int i,j; |
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164 | int temp; |
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165 | int num; |
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166 | Face *face; |
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167 | |
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168 | for (i = 0; i < nfaces; i++) { |
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169 | |
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170 | face = flist[i]; |
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171 | num = face->nverts; |
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172 | |
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173 | /* swap early vertices with later ones */ |
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174 | for (j = 0; j < num / 2; j++) { |
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175 | temp = face->verts[j]; |
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176 | face->verts[j] = face->verts[num-j-1]; |
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177 | face->verts[num-j-1] = temp; |
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178 | } |
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179 | } |
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180 | } |
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181 | |
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182 | |
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183 | /****************************************************************************** |
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184 | Negate the vertex normals. |
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185 | ******************************************************************************/ |
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186 | |
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187 | void |
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188 | negate_normals() |
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189 | { |
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190 | int i; |
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191 | |
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192 | for (i = 0; i < nverts; i++) { |
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193 | if (has_nx) vlist[i]->nx *= -1; |
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194 | if (has_ny) vlist[i]->ny *= -1; |
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195 | if (has_nz) vlist[i]->nz *= -1; |
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196 | } |
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197 | } |
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198 | |
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199 | |
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200 | /****************************************************************************** |
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201 | Read in the PLY file from standard in. |
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202 | ******************************************************************************/ |
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203 | |
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204 | void |
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205 | read_file(FILE *inFile) |
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206 | { |
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207 | int i,j,k; |
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208 | PlyFile *ply; |
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209 | int nprops; |
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210 | int num_elems; |
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211 | PlyProperty **plist; |
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212 | char *elem_name; |
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213 | float version; |
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214 | |
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215 | |
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216 | /*** Read in the original PLY object ***/ |
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217 | |
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218 | |
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219 | ply = ply_read (inFile, &nelems, &elist); |
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220 | ply_get_info (ply, &version, &file_type); |
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221 | |
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222 | for (i = 0; i < nelems; i++) { |
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223 | |
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224 | /* get the description of the first element */ |
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225 | elem_name = elist[i]; |
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226 | plist = ply_get_element_description (ply, elem_name, &num_elems, &nprops); |
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227 | |
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228 | if (equal_strings ("vertex", elem_name)) { |
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229 | |
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230 | /* see if vertex holds any normal information */ |
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231 | has_nx = has_ny = has_nz = 0; |
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232 | for (j = 0; j < nprops; j++) { |
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233 | if (equal_strings ("nx", plist[j]->name)) has_nx = 1; |
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234 | if (equal_strings ("ny", plist[j]->name)) has_ny = 1; |
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235 | if (equal_strings ("nz", plist[j]->name)) has_nz = 1; |
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236 | } |
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237 | |
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238 | /* create a vertex list to hold all the vertices */ |
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239 | vlist = (Vertex **) malloc (sizeof (Vertex *) * num_elems); |
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240 | nverts = num_elems; |
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241 | |
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242 | /* set up for getting vertex elements */ |
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243 | |
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244 | ply_get_property (ply, elem_name, &vert_props[0]); |
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245 | ply_get_property (ply, elem_name, &vert_props[1]); |
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246 | ply_get_property (ply, elem_name, &vert_props[2]); |
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247 | if (has_nx) ply_get_property (ply, elem_name, &vert_props[3]); |
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248 | if (has_ny) ply_get_property (ply, elem_name, &vert_props[4]); |
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249 | if (has_nz) ply_get_property (ply, elem_name, &vert_props[5]); |
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250 | vert_other = ply_get_other_properties (ply, elem_name, |
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251 | offsetof(Vertex,other_props)); |
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252 | |
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253 | /* grab all the vertex elements */ |
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254 | for (j = 0; j < num_elems; j++) { |
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255 | vlist[j] = (Vertex *) malloc (sizeof (Vertex)); |
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256 | ply_get_element (ply, (void *) vlist[j]); |
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257 | } |
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258 | } |
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259 | else if (equal_strings ("face", elem_name)) { |
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260 | |
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261 | /* create a list to hold all the face elements */ |
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262 | flist = (Face **) malloc (sizeof (Face *) * num_elems); |
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263 | nfaces = num_elems; |
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264 | |
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265 | /* set up for getting face elements */ |
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266 | |
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267 | ply_get_property (ply, elem_name, &face_props[0]); |
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268 | face_other = ply_get_other_properties (ply, elem_name, |
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269 | offsetof(Face,other_props)); |
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270 | |
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271 | /* grab all the face elements */ |
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272 | for (j = 0; j < num_elems; j++) { |
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273 | flist[j] = (Face *) malloc (sizeof (Face)); |
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274 | ply_get_element (ply, (void *) flist[j]); |
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275 | } |
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276 | } |
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277 | else |
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278 | other_elements = ply_get_other_element (ply, elem_name, num_elems); |
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279 | } |
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280 | |
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281 | comments = ply_get_comments (ply, &num_comments); |
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282 | obj_info = ply_get_obj_info (ply, &num_obj_info); |
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283 | |
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284 | ply_close (ply); |
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285 | } |
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286 | |
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287 | |
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288 | /****************************************************************************** |
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289 | Write out the PLY file to standard out. |
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290 | ******************************************************************************/ |
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291 | |
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292 | void |
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293 | write_file() |
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294 | { |
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295 | int i,j,k; |
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296 | PlyFile *ply; |
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297 | int num_elems; |
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298 | char *elem_name; |
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299 | |
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300 | /*** Write out the final PLY object ***/ |
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301 | |
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302 | |
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303 | ply = ply_write (stdout, nelems, elist, file_type); |
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304 | |
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305 | |
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306 | /* describe what properties go into the vertex and face elements */ |
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307 | |
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308 | ply_element_count (ply, "vertex", nverts); |
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309 | ply_describe_property (ply, "vertex", &vert_props[0]); |
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310 | ply_describe_property (ply, "vertex", &vert_props[1]); |
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311 | ply_describe_property (ply, "vertex", &vert_props[2]); |
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312 | if (has_nx) ply_describe_property (ply, "vertex", &vert_props[3]); |
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313 | if (has_ny) ply_describe_property (ply, "vertex", &vert_props[4]); |
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314 | if (has_nz) ply_describe_property (ply, "vertex", &vert_props[5]); |
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315 | ply_describe_other_properties (ply, vert_other, offsetof(Vertex,other_props)); |
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316 | |
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317 | ply_element_count (ply, "face", nfaces); |
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318 | ply_describe_property (ply, "face", &face_props[0]); |
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319 | ply_describe_other_properties (ply, face_other, offsetof(Face,other_props)); |
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320 | |
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321 | ply_describe_other_elements (ply, other_elements); |
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322 | |
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323 | for (i = 0; i < num_comments; i++) |
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324 | ply_put_comment (ply, comments[i]); |
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325 | |
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326 | for (i = 0; i < num_obj_info; i++) |
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327 | ply_put_obj_info (ply, obj_info[i]); |
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328 | |
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329 | ply_header_complete (ply); |
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330 | |
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331 | /* set up and write the vertex elements */ |
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332 | ply_put_element_setup (ply, "vertex"); |
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333 | for (i = 0; i < nverts; i++) |
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334 | ply_put_element (ply, (void *) vlist[i]); |
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335 | |
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336 | /* set up and write the face elements */ |
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337 | ply_put_element_setup (ply, "face"); |
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338 | for (i = 0; i < nfaces; i++) |
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339 | ply_put_element (ply, (void *) flist[i]); |
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340 | |
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341 | ply_put_other_elements (ply); |
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342 | |
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343 | /* close the PLY file */ |
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344 | ply_close (ply); |
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345 | } |
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346 | |
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