| 1 |
greg |
2.1 |
#ifndef lint |
| 2 |
schorsch |
2.14 |
static const char RCSid[] = "$Id: tmesh2rad.c,v 2.13 2003/06/26 00:58:09 schorsch Exp $"; |
| 3 |
greg |
2.1 |
#endif |
| 4 |
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/* |
| 5 |
greg |
2.3 |
* Convert a trianglular mesh into a Radiance description. |
| 6 |
greg |
2.1 |
* |
| 7 |
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* Unlike most other converters, we have defined a file |
| 8 |
greg |
2.3 |
* format for the input ourselves. The format contains eight types, |
| 9 |
greg |
2.1 |
* each of which is identified by a single letter. These are: |
| 10 |
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* |
| 11 |
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* # comment = a comment. Continues until end of line. |
| 12 |
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* v id Px Py Pz = a vertex. The id must be an integer. |
| 13 |
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* n Nx Ny Nz = a normal. Corresponds to most recent vertex. |
| 14 |
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* i Iu Iv = an index. Corresponds to most recent vertex. |
| 15 |
greg |
2.3 |
* p picture = a picture. Used as a pattern for following. |
| 16 |
greg |
2.1 |
* m material = a material name. Used for what follows. |
| 17 |
greg |
2.3 |
* o object = an object name. Used for what follows. |
| 18 |
greg |
2.1 |
* t id1 id2 id3 = a triangle. |
| 19 |
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* |
| 20 |
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* Only the 't' type results in any output. The others merely set values |
| 21 |
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* to be used in generating triangles. If no picture or "p -" is given, |
| 22 |
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* there will be no pattern associated with the geometry. If no material |
| 23 |
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* or "m -" is given, no material will be associated. (Note that this |
| 24 |
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* only makes sense for a mesh which is to be put into an octree for |
| 25 |
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* instancing.) Using a pattern requires that each vertex have an |
| 26 |
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* associated index value for generating the colorpict primitive. |
| 27 |
greg |
2.3 |
* Likewise, an interpolated surface normal also requires that each |
| 28 |
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* vertex of the triangle have an associated normal vector. |
| 29 |
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* It is not necessary for the normal vectors to have unit length. |
| 30 |
greg |
2.1 |
*/ |
| 31 |
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| 32 |
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#include "standard.h" |
| 33 |
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| 34 |
greg |
2.8 |
#include "tmesh.h" |
| 35 |
greg |
2.5 |
|
| 36 |
greg |
2.3 |
#define VOIDID "void" /* this is defined in object.h */ |
| 37 |
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| 38 |
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#define PATNAME "T-pat" /* triangle pattern name (reused) */ |
| 39 |
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#define TEXNAME "T-nor" /* triangle texture name (reused) */ |
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greg |
2.1 |
|
| 41 |
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#define V_DEFINED 01 /* this vertex is defined */ |
| 42 |
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#define V_HASNORM 02 /* vertex has surface normal */ |
| 43 |
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#define V_HASINDX 04 /* vertex has index */ |
| 44 |
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| 45 |
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typedef struct { |
| 46 |
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short flags; /* vertex flags, from above */ |
| 47 |
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FVECT pos; /* location */ |
| 48 |
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FVECT nor; /* normal */ |
| 49 |
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float ndx[2]; /* picture index */ |
| 50 |
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} VERTEX; |
| 51 |
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| 52 |
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VERTEX *vlist = NULL; /* our vertex list */ |
| 53 |
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int nverts = 0; /* number of vertices in our list */ |
| 54 |
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schorsch |
2.14 |
#define novert(i) (((i)<0)|((i)>=nverts) || !(vlist[i].flags&V_DEFINED)) |
| 56 |
greg |
2.1 |
|
| 57 |
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#define CHUNKSIZ 128 /* vertex allocation chunk size */ |
| 58 |
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| 59 |
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extern VERTEX *vnew(); /* allocate a vertex (never freed) */ |
| 60 |
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| 61 |
greg |
2.3 |
char *defmat = VOIDID; /* default (starting) material name */ |
| 62 |
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char *defpat = ""; /* default (starting) picture name */ |
| 63 |
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char *defobj = "T"; /* default (starting) object name */ |
| 64 |
greg |
2.1 |
|
| 65 |
greg |
2.3 |
|
| 66 |
greg |
2.1 |
main(argc, argv) /* read in T-mesh files and convert */ |
| 67 |
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int argc; |
| 68 |
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char *argv[]; |
| 69 |
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{ |
| 70 |
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FILE *fp; |
| 71 |
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int i; |
| 72 |
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| 73 |
greg |
2.3 |
for (i = 1; i < argc && argv[i][0] == '-'; i++) |
| 74 |
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switch (argv[i][1]) { |
| 75 |
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case 'o': /* object name */ |
| 76 |
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defobj = argv[++i]; |
| 77 |
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break; |
| 78 |
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case 'm': /* default material */ |
| 79 |
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defmat = argv[++i]; |
| 80 |
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break; |
| 81 |
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case 'p': /* default picture */ |
| 82 |
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defpat = argv[++i]; |
| 83 |
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break; |
| 84 |
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default: |
| 85 |
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fprintf(stderr, |
| 86 |
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"Usage: %s [-o obj][-m mat][-p pic] [file ..]\n", |
| 87 |
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argv[0]); |
| 88 |
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exit(1); |
| 89 |
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} |
| 90 |
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if (i >= argc) |
| 91 |
greg |
2.1 |
convert("<stdin>", stdin); |
| 92 |
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else |
| 93 |
greg |
2.3 |
for ( ; i < argc; i++) { |
| 94 |
greg |
2.1 |
if ((fp = fopen(argv[i], "r")) == NULL) { |
| 95 |
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perror(argv[i]); |
| 96 |
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exit(1); |
| 97 |
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} |
| 98 |
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convert(argv[i], fp); |
| 99 |
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fclose(fp); |
| 100 |
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} |
| 101 |
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exit(0); |
| 102 |
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} |
| 103 |
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| 104 |
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| 105 |
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convert(fname, fp) /* convert a T-mesh */ |
| 106 |
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char *fname; |
| 107 |
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FILE *fp; |
| 108 |
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{ |
| 109 |
greg |
2.3 |
char typ[4]; |
| 110 |
greg |
2.1 |
int id[3]; |
| 111 |
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double vec[3]; |
| 112 |
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char picfile[128]; |
| 113 |
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char matname[64]; |
| 114 |
greg |
2.3 |
char objname[64]; |
| 115 |
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register int i; |
| 116 |
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register VERTEX *lastv; |
| 117 |
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/* start fresh */ |
| 118 |
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i = nverts; |
| 119 |
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lastv = vlist; |
| 120 |
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while (i--) |
| 121 |
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(lastv++)->flags = 0; |
| 122 |
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lastv = NULL; |
| 123 |
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strcpy(picfile, defpat); |
| 124 |
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strcpy(matname, defmat); |
| 125 |
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strcpy(objname, defobj); |
| 126 |
greg |
2.1 |
|
| 127 |
greg |
2.3 |
printf("\n## T-mesh read from: %s\n", fname); |
| 128 |
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/* scan until EOF */ |
| 129 |
greg |
2.1 |
while (fscanf(fp, "%1s", typ) == 1) |
| 130 |
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switch (typ[0]) { |
| 131 |
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case 'v': /* vertex */ |
| 132 |
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if (fscanf(fp, "%d %lf %lf %lf", &id[0], |
| 133 |
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&vec[0], &vec[1], &vec[2]) != 4) |
| 134 |
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syntax(fname, fp, "Bad vertex"); |
| 135 |
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lastv = vnew(id[0], vec[0], vec[1], vec[2]); |
| 136 |
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break; |
| 137 |
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case 't': /* triangle */ |
| 138 |
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if (fscanf(fp, "%d %d %d", &id[0], &id[1], &id[2]) != 3) |
| 139 |
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syntax(fname, fp, "Bad triangle"); |
| 140 |
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if (novert(id[0]) | novert(id[1]) | novert(id[2])) |
| 141 |
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syntax(fname, fp, "Undefined triangle vertex"); |
| 142 |
greg |
2.3 |
triangle(picfile, matname, objname, &vlist[id[0]], |
| 143 |
greg |
2.1 |
&vlist[id[1]], &vlist[id[2]]); |
| 144 |
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break; |
| 145 |
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case 'n': /* surface normal */ |
| 146 |
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if (lastv == NULL) |
| 147 |
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syntax(fname, fp, "No vertex for normal"); |
| 148 |
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if (fscanf(fp, "%lf %lf %lf", |
| 149 |
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&vec[0], &vec[1], &vec[2]) != 3) |
| 150 |
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syntax(fname, fp, "Bad vertex normal"); |
| 151 |
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lastv->nor[0] = vec[0]; |
| 152 |
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lastv->nor[1] = vec[1]; |
| 153 |
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lastv->nor[2] = vec[2]; |
| 154 |
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if (normalize(lastv->nor) == 0.0) |
| 155 |
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syntax(fname, fp, "Zero vertex normal"); |
| 156 |
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lastv->flags |= V_HASNORM; |
| 157 |
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break; |
| 158 |
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case 'i': /* index position */ |
| 159 |
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if (lastv == NULL) |
| 160 |
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syntax(fname, fp, "No vertex for index"); |
| 161 |
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if (fscanf(fp, "%lf %lf", &vec[0], &vec[1]) != 2) |
| 162 |
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syntax(fname, fp, "Bad index"); |
| 163 |
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lastv->ndx[0] = vec[0]; |
| 164 |
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lastv->ndx[1] = vec[1]; |
| 165 |
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lastv->flags |= V_HASINDX; |
| 166 |
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break; |
| 167 |
greg |
2.3 |
case 'o': /* object name */ |
| 168 |
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if (fscanf(fp, "%s", objname) != 1) |
| 169 |
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syntax(fname, fp, "Bad object name"); |
| 170 |
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break; |
| 171 |
greg |
2.1 |
case 'm': /* material */ |
| 172 |
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if (fscanf(fp, "%s", matname) != 1) |
| 173 |
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syntax(fname, fp, "Bad material"); |
| 174 |
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if (matname[0] == '-' && !matname[1]) |
| 175 |
greg |
2.3 |
strcpy(matname, VOIDID); |
| 176 |
greg |
2.1 |
break; |
| 177 |
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case 'p': /* picture */ |
| 178 |
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if (fscanf(fp, "%s", picfile) != 1) |
| 179 |
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syntax(fname, fp, "Bad pattern"); |
| 180 |
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if (picfile[0] == '-' && !picfile[1]) |
| 181 |
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picfile[0] = '\0'; |
| 182 |
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break; |
| 183 |
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case '#': /* comment */ |
| 184 |
greg |
2.3 |
fputs("\n#", stdout); |
| 185 |
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while ((i = getc(fp)) != EOF) { |
| 186 |
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putchar(i); |
| 187 |
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if (i == '\n') |
| 188 |
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break; |
| 189 |
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} |
| 190 |
greg |
2.1 |
break; |
| 191 |
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default: |
| 192 |
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syntax(fname, fp, "Unknown type"); |
| 193 |
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break; |
| 194 |
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} |
| 195 |
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} |
| 196 |
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| 197 |
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| 198 |
greg |
2.3 |
triangle(pn, mod, obj, v1, v2, v3) /* put out a triangle */ |
| 199 |
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char *pn, *mod, *obj; |
| 200 |
greg |
2.1 |
register VERTEX *v1, *v2, *v3; |
| 201 |
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{ |
| 202 |
greg |
2.11 |
static char vfmt[] = "%18.12g %18.12g %18.12g\n"; |
| 203 |
greg |
2.1 |
static int ntri = 0; |
| 204 |
greg |
2.11 |
int flatness = ISFLAT; |
| 205 |
greg |
2.1 |
BARYCCM bvecs; |
| 206 |
schorsch |
2.13 |
RREAL bvm[3][3]; |
| 207 |
greg |
2.6 |
register int i; |
| 208 |
greg |
2.1 |
/* compute barycentric coordinates */ |
| 209 |
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if (v1->flags & v2->flags & v3->flags & (V_HASINDX|V_HASNORM)) |
| 210 |
greg |
2.5 |
if (comp_baryc(&bvecs, v1->pos, v2->pos, v3->pos) < 0) |
| 211 |
greg |
2.1 |
return; |
| 212 |
greg |
2.11 |
/* check flatness */ |
| 213 |
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if (v1->flags & v2->flags & v3->flags & V_HASNORM) { |
| 214 |
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flatness = flat_tri(v1->pos, v2->pos, v3->pos, |
| 215 |
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v1->nor, v2->nor, v3->nor); |
| 216 |
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if (flatness == DEGEN) |
| 217 |
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return; |
| 218 |
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} |
| 219 |
greg |
2.1 |
/* put out texture (if any) */ |
| 220 |
greg |
2.11 |
if (flatness == ISBENT || flatness == RVBENT) { |
| 221 |
greg |
2.1 |
printf("\n%s texfunc %s\n", mod, TEXNAME); |
| 222 |
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mod = TEXNAME; |
| 223 |
greg |
2.8 |
printf("4 dx dy dz %s\n", TCALNAME); |
| 224 |
greg |
2.6 |
printf("0\n"); |
| 225 |
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for (i = 0; i < 3; i++) { |
| 226 |
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bvm[i][0] = v1->nor[i]; |
| 227 |
|
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bvm[i][1] = v2->nor[i]; |
| 228 |
|
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bvm[i][2] = v3->nor[i]; |
| 229 |
|
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} |
| 230 |
|
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put_baryc(&bvecs, bvm, 3); |
| 231 |
greg |
2.1 |
} |
| 232 |
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/* put out pattern (if any) */ |
| 233 |
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if (*pn && (v1->flags & v2->flags & v3->flags & V_HASINDX)) { |
| 234 |
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printf("\n%s colorpict %s\n", mod, PATNAME); |
| 235 |
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mod = PATNAME; |
| 236 |
greg |
2.8 |
printf("7 noneg noneg noneg %s %s u v\n", pn, TCALNAME); |
| 237 |
greg |
2.6 |
printf("0\n"); |
| 238 |
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for (i = 0; i < 2; i++) { |
| 239 |
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bvm[i][0] = v1->ndx[i]; |
| 240 |
|
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bvm[i][1] = v2->ndx[i]; |
| 241 |
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bvm[i][2] = v3->ndx[i]; |
| 242 |
|
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} |
| 243 |
|
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put_baryc(&bvecs, bvm, 2); |
| 244 |
greg |
2.1 |
} |
| 245 |
greg |
2.11 |
/* put out (reversed) triangle */ |
| 246 |
greg |
2.3 |
printf("\n%s polygon %s.%d\n", mod, obj, ++ntri); |
| 247 |
greg |
2.1 |
printf("0\n0\n9\n"); |
| 248 |
greg |
2.11 |
if (flatness == RVFLAT || flatness == RVBENT) { |
| 249 |
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printf(vfmt, v3->pos[0],v3->pos[1],v3->pos[2]); |
| 250 |
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printf(vfmt, v2->pos[0],v2->pos[1],v2->pos[2]); |
| 251 |
|
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printf(vfmt, v1->pos[0],v1->pos[1],v1->pos[2]); |
| 252 |
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} else { |
| 253 |
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printf(vfmt, v1->pos[0],v1->pos[1],v1->pos[2]); |
| 254 |
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printf(vfmt, v2->pos[0],v2->pos[1],v2->pos[2]); |
| 255 |
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printf(vfmt, v3->pos[0],v3->pos[1],v3->pos[2]); |
| 256 |
|
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} |
| 257 |
greg |
2.1 |
} |
| 258 |
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| 259 |
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| 260 |
|
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VERTEX * |
| 261 |
|
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vnew(id, x, y, z) /* create a new vertex */ |
| 262 |
|
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register int id; |
| 263 |
|
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double x, y, z; |
| 264 |
|
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{ |
| 265 |
|
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register int i; |
| 266 |
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|
| 267 |
greg |
2.4 |
if (id >= nverts) { /* get some more */ |
| 268 |
greg |
2.1 |
i = nverts; |
| 269 |
greg |
2.4 |
nverts = CHUNKSIZ*((id/CHUNKSIZ)+1); |
| 270 |
greg |
2.1 |
if (vlist == NULL) |
| 271 |
|
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vlist = (VERTEX *)malloc(nverts*sizeof(VERTEX)); |
| 272 |
|
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else |
| 273 |
greg |
2.12 |
vlist = (VERTEX *)realloc((void *)vlist, |
| 274 |
greg |
2.1 |
nverts*sizeof(VERTEX)); |
| 275 |
|
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if (vlist == NULL) { |
| 276 |
|
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fprintf(stderr, |
| 277 |
|
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"Out of memory while allocating vertex %d\n", id); |
| 278 |
|
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exit(1); |
| 279 |
|
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} |
| 280 |
greg |
2.3 |
while (i < nverts) /* clear what's new */ |
| 281 |
greg |
2.1 |
vlist[i++].flags = 0; |
| 282 |
|
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} |
| 283 |
greg |
2.3 |
/* assign new vertex */ |
| 284 |
greg |
2.1 |
vlist[id].pos[0] = x; |
| 285 |
|
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vlist[id].pos[1] = y; |
| 286 |
|
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vlist[id].pos[2] = z; |
| 287 |
|
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vlist[id].flags = V_DEFINED; |
| 288 |
|
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/* return it */ |
| 289 |
|
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return(&vlist[id]); |
| 290 |
|
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} |
| 291 |
|
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|
| 292 |
|
|
|
| 293 |
|
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syntax(fn, fp, er) /* report syntax error and exit */ |
| 294 |
|
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char *fn; |
| 295 |
|
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register FILE *fp; |
| 296 |
|
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char *er; |
| 297 |
|
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{ |
| 298 |
|
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extern long ftell(); |
| 299 |
|
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register long cpos; |
| 300 |
|
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register int c; |
| 301 |
|
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int lineno; |
| 302 |
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|
| 303 |
|
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if (fp == stdin) |
| 304 |
greg |
2.3 |
fprintf(stderr, "%s: T-mesh format error: %s\n", fn, er); |
| 305 |
greg |
2.1 |
else { |
| 306 |
|
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cpos = ftell(fp); |
| 307 |
|
|
fseek(fp, 0L, 0); |
| 308 |
|
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lineno = 1; |
| 309 |
|
|
while (cpos-- > 0) { |
| 310 |
|
|
if ((c = getc(fp)) == EOF) |
| 311 |
|
|
break; |
| 312 |
|
|
if (c == '\n') |
| 313 |
|
|
lineno++; |
| 314 |
|
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} |
| 315 |
greg |
2.3 |
fprintf(stderr, "%s: T-mesh format error at line %d: %s\n", |
| 316 |
greg |
2.1 |
fn, lineno, er); |
| 317 |
|
|
} |
| 318 |
|
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exit(1); |
| 319 |
|
|
} |
