[37] | 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 <Inventor/So.h> |
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| 15 | #include <Inventor/nodes/SoIndexedFaceSet.h> |
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| 16 | #include <Inventor/actions/SoWriteAction.h> |
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| 17 | |
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| 18 | TriangleVertex *verts; |
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| 19 | int npolys; |
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| 20 | |
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| 21 | |
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| 22 | void write_polys_inventor(FILE *fp); |
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| 23 | void write_polys(FILE *fp_out); |
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| 24 | |
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| 25 | |
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| 26 | /****************************************************************************** |
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| 27 | Main routine. |
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| 28 | ******************************************************************************/ |
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| 29 | |
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| 30 | void |
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| 31 | main(int, char **argv) |
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| 32 | { |
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| 33 | int i,j; |
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| 34 | FILE *fp; |
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| 35 | FILE *fp_out; |
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| 36 | char infile[80],outfile[80]; |
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| 37 | mcfile header; |
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| 38 | int index; |
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| 39 | |
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| 40 | strcpy (infile, argv[1]); |
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| 41 | strcpy (outfile, argv[2]); |
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| 42 | |
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| 43 | if (strlen (infile) < 3 || |
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| 44 | strcmp (infile + strlen (infile) - 3, ".mc") != 0) |
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| 45 | strcat (infile, ".mc"); |
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| 46 | |
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| 47 | if (strlen (outfile) < 5 || |
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| 48 | strcmp (outfile + strlen (outfile) - 5, ".poly") != 0) |
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| 49 | strcat (outfile, ".poly"); |
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| 50 | |
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| 51 | printf ("reading polygons from '%s'\n", infile); |
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| 52 | |
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| 53 | /* open the polygon input file */ |
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| 54 | |
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| 55 | if ((fp = fopen(infile, "r")) == NULL) { |
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| 56 | fprintf (stderr, "bad open\n"); |
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| 57 | exit (-1); |
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| 58 | } |
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| 59 | |
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| 60 | /* open the polygon output file */ |
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| 61 | |
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| 62 | if ((fp_out = fopen(outfile, "w+b")) == NULL) { |
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| 63 | fprintf (stderr, "bad open\n"); |
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| 64 | exit (-1); |
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| 65 | } |
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| 66 | |
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| 67 | /* read header info from the polygon file */ |
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| 68 | header = MC_ReadHeader (fp); |
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| 69 | |
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| 70 | /* |
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| 71 | npolys = header.mc_length / (3 * sizeof (sizeof(TriangleVertex))); |
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| 72 | */ |
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| 73 | npolys = header.mc_length / 42; |
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| 74 | printf ("%d polygons\n", npolys); |
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| 75 | verts = (TriangleVertex *) malloc (sizeof (TriangleVertex) * 3 * npolys); |
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| 76 | if (verts == 0) { |
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| 77 | fprintf (stderr, "can't allocate enough space\n"); |
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| 78 | exit (-1); |
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| 79 | } |
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| 80 | |
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| 81 | /* read in the polygons */ |
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| 82 | printf ("reading polygons...\n"); |
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| 83 | for (i = 0; i < npolys; i++) { |
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| 84 | for (j = 0; j < 3; j++) { |
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| 85 | index = i * 3 + j; |
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| 86 | verts[index] = MC_ReadTriangleVertex (fp); |
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| 87 | } |
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| 88 | } |
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| 89 | |
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| 90 | /* write polygons to output file */ |
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| 91 | printf ("writing polygons...\n"); |
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| 92 | write_polys_inventor (fp_out); |
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| 93 | fclose (fp_out); |
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| 94 | |
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| 95 | printf ("done.\n"); |
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| 96 | } |
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| 97 | |
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| 98 | |
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| 99 | /****************************************************************************** |
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| 100 | Write out polygons in Inventor format. |
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| 101 | ******************************************************************************/ |
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| 102 | |
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| 103 | void |
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| 104 | write_polys_inventor(FILE *fp) |
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| 105 | { |
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| 106 | int i,j; |
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| 107 | int index; |
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| 108 | float x,y,z; |
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| 109 | float nx,ny,nz; |
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| 110 | float len; |
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| 111 | |
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| 112 | SoDB::init(); |
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| 113 | |
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| 114 | SoSeparator *root = new SoSeparator; |
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| 115 | root->ref(); |
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| 116 | |
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| 117 | SoCoordinate3 *coord = new SoCoordinate3; |
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| 118 | root->addChild(coord); |
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| 119 | |
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| 120 | coord->point.insertSpace(0, npolys*3); |
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| 121 | |
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| 122 | for (i = 0; i < npolys; i++) { |
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| 123 | for (j = 0; j < 3; j++) { |
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| 124 | index = i * 3 + j; |
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| 125 | x = verts[index].x / 128.0; |
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| 126 | y = verts[index].y / 128.0; |
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| 127 | z = verts[index].z / 128.0; |
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| 128 | coord->point.set1Value(index, x, y, z); |
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| 129 | } |
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| 130 | } |
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| 131 | |
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| 132 | /* |
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| 133 | SoNormal *norm = new SoNormal; |
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| 134 | root->addChild(norm); |
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| 135 | |
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| 136 | norm->vector.insertSpace(0, npolys*3); |
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| 137 | |
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| 138 | for (i = 0; i < npolys; i++) { |
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| 139 | for (j = 0; j < 3; j++) { |
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| 140 | index = i * 3 + j; |
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| 141 | nx = -verts[index].nx; |
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| 142 | ny = -verts[index].ny; |
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| 143 | nz = -verts[index].nz; |
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| 144 | len = sqrt (nx*nx + ny*ny + nz*nz); |
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| 145 | nx /= len; |
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| 146 | ny /= len; |
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| 147 | nz /= len; |
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| 148 | norm->vector.set1Value(index, nx, ny, nz); |
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| 149 | } |
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| 150 | } |
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| 151 | */ |
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| 152 | |
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| 153 | SoIndexedFaceSet *faceSet = new SoIndexedFaceSet; |
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| 154 | root->addChild(faceSet); |
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| 155 | |
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| 156 | faceSet->coordIndex.insertSpace(0, npolys*4); |
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| 157 | index = 0; |
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| 158 | for (i = 0; i < npolys; i++) { |
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| 159 | SbVec3f v1(verts[i*3].x, verts[i*3].y, verts[i*3].z); |
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| 160 | SbVec3f v2(verts[i*3+1].x, verts[i*3+1].y, verts[i*3+1].z); |
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| 161 | SbVec3f v3(verts[i*3+2].x, verts[i*3+2].y, verts[i*3+2].z); |
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| 162 | |
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| 163 | SbVec3f a = v2 - v1; |
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| 164 | SbVec3f b = v3 - v1; |
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| 165 | SbVec3f c = a.cross(b); |
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| 166 | SbVec3f norm(-verts[i*3].nx, -verts[i*3].ny, -verts[i*3].nz); |
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| 167 | if (c.dot(norm) > 0) { |
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| 168 | faceSet->coordIndex.set1Value(index, i*3); |
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| 169 | faceSet->coordIndex.set1Value(index+1, i*3+1); |
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| 170 | faceSet->coordIndex.set1Value(index+2, i*3+2); |
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| 171 | faceSet->coordIndex.set1Value(index+3, -1); |
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| 172 | } |
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| 173 | else { |
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| 174 | faceSet->coordIndex.set1Value(index, i*3+1); |
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| 175 | faceSet->coordIndex.set1Value(index+1, i*3); |
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| 176 | faceSet->coordIndex.set1Value(index+2, i*3+2); |
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| 177 | faceSet->coordIndex.set1Value(index+3, -1); |
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| 178 | } |
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| 179 | index += 4; |
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| 180 | } |
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| 181 | |
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| 182 | SoWriteAction wa; |
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| 183 | wa.getOutput()->setFilePointer(fp); |
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| 184 | wa.getOutput()->setBinary(TRUE); |
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| 185 | wa.apply(root); |
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| 186 | } |
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| 187 | |
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| 188 | |
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| 189 | /* write out the vertices */ |
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| 190 | |
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| 191 | /* |
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| 192 | fprintf (fp, "#Inventor V1.0 ascii\n"); |
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| 193 | fprintf (fp, "Separator {\n"); |
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| 194 | |
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| 195 | fprintf (fp, "Coordinate3 {\n"); |
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| 196 | fprintf (fp, "point [\n"); |
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| 197 | for (i = 0; i < npolys; i++) { |
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| 198 | for (j = 0; j < 3; j++) { |
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| 199 | index = i * 3 + j; |
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| 200 | x = verts[index].x / 128.0; |
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| 201 | y = verts[index].y / 128.0; |
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| 202 | z = verts[index].z / 128.0; |
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| 203 | fprintf (fp, "%f %f %f,\n", x, y, z); |
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| 204 | } |
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| 205 | } |
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| 206 | fprintf (fp, "]\n"); |
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| 207 | fprintf (fp, "}\n"); |
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| 208 | */ |
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| 209 | |
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| 210 | /* write out the vertex normals */ |
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| 211 | |
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| 212 | /* |
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| 213 | fprintf (fp, "Normal {\n"); |
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| 214 | fprintf (fp, "vector [\n"); |
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| 215 | for (i = 0; i < npolys; i++) { |
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| 216 | for (j = 0; j < 3; j++) { |
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| 217 | index = i * 3 + j; |
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| 218 | nx = verts[index].nx; |
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| 219 | ny = verts[index].ny; |
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| 220 | nz = verts[index].nz; |
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| 221 | len = sqrt (nx*nx + ny*ny + nz*nz); |
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| 222 | nx /= len; |
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| 223 | ny /= len; |
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| 224 | nz /= len; |
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| 225 | fprintf (fp, "%f %f %f,\n", -nx, -ny, -nz); |
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| 226 | } |
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| 227 | } |
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| 228 | fprintf (fp, "]\n"); |
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| 229 | fprintf (fp, "}\n"); |
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| 230 | */ |
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| 231 | |
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| 232 | /* write out the vertex indices for each face */ |
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| 233 | |
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| 234 | /* |
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| 235 | fprintf (fp, "IndexedFaceSet {\n"); |
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| 236 | fprintf (fp, "coordIndex [\n"); |
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| 237 | for (i = 0; i < npolys; i++) { |
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| 238 | fprintf (fp, "%d, %d, %d, -1,\n", i*3, i*3+1, i*3+2); |
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| 239 | } |
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| 240 | fprintf (fp, "]\n"); |
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| 241 | fprintf (fp, "}\n"); |
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| 242 | |
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| 243 | fprintf (fp, "}\n"); |
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| 244 | */ |
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| 245 | |
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| 246 | |
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| 247 | |
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| 248 | /****************************************************************************** |
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| 249 | Write out polygons in my format. |
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| 250 | ******************************************************************************/ |
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| 251 | |
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| 252 | void |
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| 253 | write_polys(FILE *fp_out) |
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| 254 | { |
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| 255 | int i,j; |
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| 256 | int index; |
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| 257 | float x,y,z; |
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| 258 | float nx,ny,nz; |
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| 259 | float len; |
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| 260 | |
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| 261 | fprintf (fp_out, "vertices: %d\n", npolys * 3); |
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| 262 | fprintf (fp_out, "faces: %d\n", npolys); |
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| 263 | |
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| 264 | /* write out the vertices */ |
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| 265 | for (i = 0; i < npolys; i++) { |
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| 266 | for (j = 0; j < 3; j++) { |
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| 267 | index = i * 3 + j; |
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| 268 | x = verts[index].x / 128.0; |
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| 269 | y = verts[index].y / 128.0; |
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| 270 | z = verts[index].z / 128.0; |
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| 271 | nx = verts[index].nx; |
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| 272 | ny = verts[index].ny; |
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| 273 | nz = verts[index].nz; |
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| 274 | len = sqrt (nx*nx + ny*ny + nz*nz); |
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| 275 | nx /= len; |
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| 276 | ny /= len; |
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| 277 | nz /= len; |
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| 278 | fprintf (fp_out, "v %f %f %f %f %f %f\n", x, y, z, nx, ny, nz); |
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| 279 | } |
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| 280 | } |
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| 281 | |
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| 282 | /* write out the vertex indices for each face */ |
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| 283 | for (i = 0; i < npolys; i++) { |
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| 284 | fprintf (fp_out, "f %d %d %d\n", i*3+1, i*3+2, i*3+3); |
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| 285 | } |
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| 286 | } |
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| 287 | |
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