1 | /* |
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2 | |
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3 | Sample code showing how to read and write PLY polygon files. |
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4 | |
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5 | Greg Turk, March 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 <math.h> |
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11 | #include <ply.h> |
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12 | #include <malloc.h> |
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13 | |
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14 | /* user's vertex and face definitions for a polygonal object */ |
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15 | |
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16 | typedef struct Vertex { |
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17 | float x,y,z; /* the usual 3-space position of a vertex */ |
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18 | } Vertex; |
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19 | |
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20 | typedef struct Face { |
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21 | unsigned char intensity; /* this user attaches intensity to faces */ |
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22 | unsigned char nverts; /* number of vertex indices in list */ |
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23 | int *verts; /* vertex index list */ |
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24 | } Face; |
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25 | |
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26 | /* polygon description of an object (a cube) */ |
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27 | |
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28 | Vertex verts[] = { /* vertices */ |
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29 | { 0.0, 0.0, 0.0}, |
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30 | { 1.0, 0.0, 0.0}, |
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31 | { 1.0, 1.0, 0.0}, |
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32 | { 0.0, 1.0, 0.0}, |
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33 | { 0.0, 0.0, 1.0}, |
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34 | { 1.0, 0.0, 1.0}, |
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35 | { 1.0, 1.0, 1.0}, |
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36 | { 0.0, 1.0, 1.0}, |
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37 | }; |
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38 | |
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39 | Face faces[] = { /* faces */ |
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40 | { '\001', 4, NULL }, /* intensity, vertex list count, vertex list (empty) */ |
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41 | { '\004', 4, NULL }, |
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42 | { '\010', 4, NULL }, |
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43 | { '\020', 4, NULL }, |
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44 | { '\144', 4, NULL }, |
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45 | { '\377', 4, NULL }, |
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46 | }; |
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47 | |
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48 | /* list of vertices for each face */ |
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49 | /* (notice that indices begin at zero) */ |
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50 | |
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51 | typedef int Vertex_Indices[4]; |
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52 | Vertex_Indices vert_ptrs[] = { |
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53 | { 0, 1, 2, 3 }, |
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54 | { 7, 6, 5, 4 }, |
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55 | { 0, 4, 5, 1 }, |
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56 | { 1, 5, 6, 2 }, |
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57 | { 2, 6, 7, 3 }, |
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58 | { 3, 7, 4, 0 }, |
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59 | }; |
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60 | |
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61 | /* information needed to describe the user's data to the PLY routines */ |
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62 | |
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63 | char *elem_names[] = { /* list of the kinds of elements in the user's object */ |
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64 | "vertex", "face" |
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65 | }; |
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66 | |
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67 | PlyProperty vert_props[] = { /* list of property information for a vertex */ |
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68 | {"x", PLY_FLOAT, PLY_FLOAT, offsetof(Vertex,x), 0, 0, 0, 0}, |
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69 | {"y", PLY_FLOAT, PLY_FLOAT, offsetof(Vertex,y), 0, 0, 0, 0}, |
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70 | {"z", PLY_FLOAT, PLY_FLOAT, offsetof(Vertex,z), 0, 0, 0, 0}, |
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71 | }; |
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72 | |
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73 | PlyProperty face_props[] = { /* list of property information for a vertex */ |
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74 | {"intensity", PLY_UCHAR, PLY_UCHAR, offsetof(Face,intensity), 0, 0, 0, 0}, |
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75 | {"vertex_indices", PLY_INT, PLY_INT, offsetof(Face,verts), |
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76 | 1, PLY_UCHAR, PLY_UCHAR, offsetof(Face,nverts)}, |
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77 | }; |
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78 | |
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79 | |
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80 | |
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81 | /****************************************************************************** |
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82 | The main routine just creates and then reads a PLY file. |
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83 | ******************************************************************************/ |
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84 | |
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85 | main() |
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86 | { |
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87 | |
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88 | #if 1 |
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89 | /* write a PLY file */ |
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90 | write_test(); |
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91 | #endif |
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92 | |
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93 | #if 1 |
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94 | /* read a PLY file */ |
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95 | read_test(); |
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96 | #endif |
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97 | |
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98 | } |
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99 | |
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100 | |
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101 | /****************************************************************************** |
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102 | Write out a PLY file. |
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103 | ******************************************************************************/ |
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104 | |
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105 | int write_test() |
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106 | { |
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107 | int i,j; |
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108 | PlyFile *ply; |
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109 | int nelems; |
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110 | char **elist; |
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111 | int file_type; |
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112 | float version; |
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113 | int nverts = sizeof (verts) / sizeof (Vertex); |
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114 | int nfaces = sizeof (faces) / sizeof (Face); |
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115 | |
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116 | /* create the vertex index lists for the faces */ |
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117 | for (i = 0; i < nfaces; i++) |
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118 | faces[i].verts = vert_ptrs[i]; |
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119 | |
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120 | /* open either a binary or ascii PLY file for writing */ |
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121 | /* (the file will be called "test.ply" because the routines */ |
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122 | /* enforce the .ply filename extension) */ |
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123 | |
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124 | #if 1 |
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125 | ply = ply_open_for_writing("test", 2, elem_names, PLY_ASCII, &version); |
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126 | #else |
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127 | ply = ply_open_for_writing("test", 2, elem_names, PLY_BINARY_BE, &version); |
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128 | #endif |
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129 | |
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130 | /* describe what properties go into the vertex and face elements */ |
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131 | |
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132 | ply_element_count (ply, "vertex", nverts); |
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133 | ply_describe_property (ply, "vertex", &vert_props[0]); |
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134 | ply_describe_property (ply, "vertex", &vert_props[1]); |
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135 | ply_describe_property (ply, "vertex", &vert_props[2]); |
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136 | |
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137 | ply_element_count (ply, "face", nfaces); |
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138 | ply_describe_property (ply, "face", &face_props[0]); |
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139 | ply_describe_property (ply, "face", &face_props[1]); |
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140 | |
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141 | /* write a comment and an object information field */ |
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142 | ply_put_comment (ply, "author: Greg Turk"); |
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143 | ply_put_obj_info (ply, "random information"); |
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144 | |
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145 | /* we have described exactly what we will put in the file, so */ |
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146 | /* we are now done with the header info */ |
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147 | ply_header_complete (ply); |
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148 | |
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149 | /* set up and write the vertex elements */ |
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150 | ply_put_element_setup (ply, "vertex"); |
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151 | for (i = 0; i < nverts; i++) |
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152 | ply_put_element (ply, (void *) &verts[i]); |
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153 | |
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154 | /* set up and write the face elements */ |
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155 | ply_put_element_setup (ply, "face"); |
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156 | for (i = 0; i < nfaces; i++) |
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157 | ply_put_element (ply, (void *) &faces[i]); |
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158 | |
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159 | /* close the PLY file */ |
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160 | ply_close (ply); |
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161 | |
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162 | return(0); |
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163 | } |
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164 | |
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165 | |
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166 | /****************************************************************************** |
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167 | Read in a PLY file. |
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168 | ******************************************************************************/ |
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169 | |
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170 | int read_test() |
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171 | { |
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172 | int i,j,k; |
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173 | PlyFile *ply; |
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174 | int nelems; |
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175 | char **elist; |
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176 | int file_type; |
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177 | float version; |
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178 | int nprops; |
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179 | int num_elems; |
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180 | PlyProperty **plist; |
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181 | Vertex **vlist; |
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182 | Face **flist; |
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183 | char *elem_name; |
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184 | int num_comments; |
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185 | char **comments; |
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186 | int num_obj_info; |
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187 | char **obj_info; |
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188 | |
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189 | /* open a PLY file for reading */ |
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190 | ply = ply_open_for_reading("test", &nelems, &elist, &file_type, &version); |
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191 | |
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192 | /* print what we found out about the file */ |
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193 | printf ("version %f\n", version); |
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194 | printf ("type %d\n", file_type); |
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195 | |
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196 | /* go through each kind of element that we learned is in the file */ |
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197 | /* and read them */ |
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198 | |
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199 | for (i = 0; i < nelems; i++) { |
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200 | |
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201 | /* get the description of the first element */ |
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202 | elem_name = elist[i]; |
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203 | plist = ply_get_element_description (ply, elem_name, &num_elems, &nprops); |
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204 | |
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205 | /* print the name of the element, for debugging */ |
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206 | printf ("element %s %d\n", elem_name, num_elems); |
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207 | |
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208 | /* if we're on vertex elements, read them in */ |
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209 | if (equal_strings ("vertex", elem_name)) { |
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210 | |
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211 | /* create a vertex list to hold all the vertices */ |
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212 | vlist = (Vertex **) malloc (sizeof (Vertex *) * num_elems); |
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213 | |
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214 | /* set up for getting vertex elements */ |
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215 | |
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216 | ply_get_property (ply, elem_name, &vert_props[0]); |
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217 | ply_get_property (ply, elem_name, &vert_props[1]); |
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218 | ply_get_property (ply, elem_name, &vert_props[2]); |
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219 | |
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220 | /* grab all the vertex elements */ |
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221 | for (j = 0; j < num_elems; j++) { |
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222 | |
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223 | /* grab and element from the file */ |
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224 | vlist[j] = (Vertex *) malloc (sizeof (Vertex)); |
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225 | ply_get_element (ply, (void *) vlist[j]); |
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226 | |
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227 | /* print out vertex x,y,z for debugging */ |
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228 | printf ("vertex: %g %g %g\n", vlist[j]->x, vlist[j]->y, vlist[j]->z); |
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229 | } |
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230 | } |
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231 | |
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232 | /* if we're on face elements, read them in */ |
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233 | if (equal_strings ("face", elem_name)) { |
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234 | |
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235 | /* create a list to hold all the face elements */ |
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236 | flist = (Face **) malloc (sizeof (Face *) * num_elems); |
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237 | |
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238 | /* set up for getting face elements */ |
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239 | |
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240 | ply_get_property (ply, elem_name, &face_props[0]); |
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241 | ply_get_property (ply, elem_name, &face_props[1]); |
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242 | |
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243 | /* grab all the face elements */ |
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244 | for (j = 0; j < num_elems; j++) { |
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245 | |
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246 | /* grab and element from the file */ |
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247 | flist[j] = (Face *) malloc (sizeof (Face)); |
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248 | ply_get_element (ply, (void *) flist[j]); |
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249 | |
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250 | /* print out face info, for debugging */ |
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251 | printf ("face: %d, list = ", flist[j]->intensity); |
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252 | for (k = 0; k < flist[j]->nverts; k++) |
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253 | printf ("%d ", flist[j]->verts[k]); |
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254 | printf ("\n"); |
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255 | } |
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256 | } |
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257 | |
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258 | /* print out the properties we got, for debugging */ |
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259 | for (j = 0; j < nprops; j++) |
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260 | printf ("property %s\n", plist[j]->name); |
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261 | } |
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262 | |
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263 | /* grab and print out the comments in the file */ |
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264 | comments = ply_get_comments (ply, &num_comments); |
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265 | for (i = 0; i < num_comments; i++) |
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266 | printf ("comment = '%s'\n", comments[i]); |
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267 | |
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268 | /* grab and print out the object information */ |
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269 | obj_info = ply_get_obj_info (ply, &num_obj_info); |
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270 | for (i = 0; i < num_obj_info; i++) |
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271 | printf ("obj_info = '%s'\n", obj_info[i]); |
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272 | |
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273 | /* close the PLY file */ |
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274 | ply_close (ply); |
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275 | |
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276 | return(0); |
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277 | } |
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278 | |
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