1 | /* |
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2 | |
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3 | Converts from Paul Ning's polygon file format to text polygon description. |
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4 | |
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5 | Greg Turk - November 1992 |
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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 <malloc.h> |
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11 | #include "mcfile.h" |
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12 | #include <math.h> |
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13 | #include <string.h> |
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14 | #include <unistd.h> |
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15 | |
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16 | #include "Linear.h" |
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17 | |
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18 | #include "ply.h" |
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19 | |
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20 | struct PlyVertex { |
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21 | float x, y, z; |
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22 | float nx, ny, nz; |
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23 | }; |
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24 | |
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25 | struct PlyFace { |
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26 | unsigned char nverts; |
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27 | int *verts; |
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28 | }; |
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29 | |
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30 | static PlyVertex *vert_dummy; |
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31 | #define voffset(field) ((char *) (&vert_dummy->field) - (char *) vert_dummy) |
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32 | |
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33 | static PlyFace *face_dummy; |
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34 | #define foffset(field) ((char *) (&face_dummy->field) - (char *) face_dummy) |
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35 | |
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36 | static char *elem_names[] = { |
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37 | "vertex", "face", |
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38 | }; |
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39 | |
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40 | static PlyProperty vert_props[] = { |
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41 | {"x", PLY_FLOAT, PLY_FLOAT, 0, 0, PLY_START_TYPE, PLY_START_TYPE, 0}, |
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42 | {"y", PLY_FLOAT, PLY_FLOAT, 0, 0, PLY_START_TYPE, PLY_START_TYPE, 0}, |
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43 | {"z", PLY_FLOAT, PLY_FLOAT, 0, 0, PLY_START_TYPE, PLY_START_TYPE, 0}, |
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44 | {"nx", PLY_FLOAT, PLY_FLOAT, 0, 0, PLY_START_TYPE, PLY_START_TYPE, 0}, |
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45 | {"ny", PLY_FLOAT, PLY_FLOAT, 0, 0, PLY_START_TYPE, PLY_START_TYPE, 0}, |
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46 | {"nz", PLY_FLOAT, PLY_FLOAT, 0, 0, PLY_START_TYPE, PLY_START_TYPE, 0} |
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47 | }; |
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48 | |
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49 | static PlyProperty face_props[] = { |
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50 | {"vertex_indices", PLY_INT, PLY_INT, 0, 1, PLY_UCHAR, PLY_UCHAR, 0}, |
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51 | }; |
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52 | |
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53 | |
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54 | TriangleVertex *verts; |
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55 | int npolys; |
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56 | |
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57 | |
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58 | void write_polys_ply(char *filename); |
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59 | |
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60 | |
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61 | /****************************************************************************** |
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62 | Main routine. |
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63 | ******************************************************************************/ |
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64 | |
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65 | void |
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66 | main(int, char **argv) |
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67 | { |
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68 | int i,j; |
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69 | FILE *fp; |
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70 | char infile[80],outfile[80]; |
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71 | mcfile header; |
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72 | int index; |
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73 | |
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74 | strcpy (infile, argv[1]); |
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75 | strcpy (outfile, argv[2]); |
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76 | |
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77 | if (strlen (infile) < 3 || |
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78 | strcmp (infile + strlen (infile) - 3, ".mc") != 0) |
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79 | strcat (infile, ".mc"); |
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80 | |
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81 | if (strlen (outfile) < 5 || |
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82 | strcmp (outfile + strlen (outfile) - 5, ".ply") != 0) |
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83 | strcat (outfile, ".ply"); |
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84 | |
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85 | printf ("reading polygons from '%s'\n", infile); |
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86 | |
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87 | /* open the polygon input file */ |
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88 | |
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89 | if ((fp = fopen(infile, "r")) == NULL) { |
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90 | fprintf (stderr, "bad open\n"); |
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91 | exit (-1); |
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92 | } |
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93 | |
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94 | /* open the polygon output file */ |
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95 | |
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96 | /* |
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97 | if ((fp_out = fopen(outfile, "w+b")) == NULL) { |
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98 | fprintf (stderr, "bad open\n"); |
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99 | exit (-1); |
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100 | } |
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101 | */ |
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102 | |
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103 | /* read header info from the polygon file */ |
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104 | header = MC_ReadHeader (fp); |
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105 | |
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106 | /* |
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107 | npolys = header.mc_length / (3 * sizeof (sizeof(TriangleVertex))); |
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108 | */ |
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109 | npolys = header.mc_length / 42; |
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110 | printf ("%d polygons\n", npolys); |
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111 | verts = (TriangleVertex *) malloc (sizeof (TriangleVertex) * 3 * npolys); |
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112 | if (verts == 0) { |
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113 | fprintf (stderr, "can't allocate enough space\n"); |
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114 | exit (-1); |
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115 | } |
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116 | |
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117 | /* read in the polygons */ |
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118 | printf ("reading polygons...\n"); |
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119 | for (i = 0; i < npolys; i++) { |
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120 | for (j = 0; j < 3; j++) { |
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121 | index = i * 3 + j; |
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122 | verts[index] = MC_ReadTriangleVertex (fp); |
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123 | } |
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124 | } |
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125 | |
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126 | /* write polygons to output file */ |
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127 | printf ("writing polygons...\n"); |
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128 | write_polys_ply (outfile); |
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129 | |
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130 | printf ("done.\n"); |
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131 | } |
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132 | |
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133 | |
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134 | /****************************************************************************** |
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135 | Write out polygons in Inventor format. |
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136 | ******************************************************************************/ |
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137 | |
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138 | void |
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139 | write_polys_ply(char *filename) |
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140 | { |
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141 | int i,j; |
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142 | int index; |
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143 | float len; |
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144 | float version; |
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145 | |
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146 | PlyFile *ply = ply_open_for_writing(filename, 2, elem_names, |
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147 | PLY_BINARY_BE, &version); |
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148 | |
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149 | |
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150 | // Shouldn't this be a tri-strip-set??? |
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151 | int numVerts = 3*npolys; // Hugely inefficient!! |
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152 | int numFaces = npolys; |
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153 | |
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154 | int nvp = 0; |
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155 | vert_props[nvp].offset = voffset(x); nvp++; |
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156 | vert_props[nvp].offset = voffset(y); nvp++; |
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157 | vert_props[nvp].offset = voffset(z); nvp++; |
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158 | |
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159 | vert_props[nvp].offset = voffset(nx); nvp++; |
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160 | vert_props[nvp].offset = voffset(ny); nvp++; |
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161 | vert_props[nvp].offset = voffset(nz); nvp++; |
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162 | |
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163 | |
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164 | face_props[0].offset = foffset(verts); |
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165 | face_props[0].count_offset = foffset(nverts); /* count offset */ |
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166 | |
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167 | ply_describe_element (ply, "vertex", numVerts, |
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168 | nvp, vert_props); |
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169 | |
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170 | ply_describe_element (ply, "face", npolys, 1, face_props); |
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171 | |
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172 | ply_header_complete (ply); |
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173 | |
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174 | /* set up and write the vertex elements */ |
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175 | PlyVertex vert; |
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176 | ply_put_element_setup (ply, "vertex"); |
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177 | for (i = 0; i < npolys; i++) { |
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178 | for (j = 0; j < 3; j++) { |
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179 | index = i * 3 + j; |
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180 | vert.x = verts[index].x / 128.0; |
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181 | vert.y = verts[index].y / 128.0; |
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182 | vert. z = verts[index].z / 128.0; |
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183 | vert.nx = -verts[index].nx; |
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184 | vert.ny = -verts[index].ny; |
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185 | vert.nz = -verts[index].nz; |
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186 | len = sqrt (vert.nx*vert.nx + vert.ny*vert.ny + vert.nz*vert.nz); |
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187 | vert.nx /= len; |
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188 | vert.ny /= len; |
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189 | vert.nz /= len; |
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190 | ply_put_element (ply, (void *) &vert); |
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191 | } |
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192 | } |
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193 | |
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194 | /* set up and write the face elements */ |
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195 | PlyFace face; |
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196 | int v[3]; |
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197 | face.nverts = 3; |
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198 | face.verts = (int *)(v); |
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199 | ply_put_element_setup (ply, "face"); |
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200 | for (i = 0; i < npolys; i++) { |
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201 | Vec3f v1(verts[i*3].x, verts[i*3].y, verts[i*3].z); |
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202 | Vec3f v2(verts[i*3+1].x, verts[i*3+1].y, verts[i*3+1].z); |
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203 | Vec3f v3(verts[i*3+2].x, verts[i*3+2].y, verts[i*3+2].z); |
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204 | |
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205 | Vec3f a = v2 - v1; |
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206 | Vec3f b = v3 - v1; |
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207 | Vec3f c = a.cross(b); |
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208 | Vec3f norm(-verts[i*3].nx, -verts[i*3].ny, -verts[i*3].nz); |
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209 | if (c.dot(norm) > 0) { |
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210 | face.verts[0] = i*3; |
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211 | face.verts[1] = i*3+1; |
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212 | face.verts[2] = i*3+2; |
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213 | } |
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214 | else { |
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215 | face.verts[0] = i*3+1; |
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216 | face.verts[1] = i*3; |
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217 | face.verts[2] = i*3+2; |
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218 | } |
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219 | ply_put_element (ply, (void *) &face); |
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220 | } |
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221 | |
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222 | /* close the PLY file */ |
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223 | ply_close (ply); |
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224 | } |
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225 | |
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