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greg |
2.1 |
/* Copyright (c) 1994 Regents of the University of California */
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#ifndef lint
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static char SCCSid[] = "$SunId$ LBL";
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#endif
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/*
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greg |
2.3 |
* Convert a trianglular mesh into a Radiance description.
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greg |
2.1 |
*
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* Unlike most other converters, we have defined a file
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greg |
2.3 |
* format for the input ourselves. The format contains eight types,
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greg |
2.1 |
* each of which is identified by a single letter. These are:
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*
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* # comment = a comment. Continues until end of line.
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* v id Px Py Pz = a vertex. The id must be an integer.
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* n Nx Ny Nz = a normal. Corresponds to most recent vertex.
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* i Iu Iv = an index. Corresponds to most recent vertex.
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greg |
2.3 |
* p picture = a picture. Used as a pattern for following.
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greg |
2.1 |
* m material = a material name. Used for what follows.
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greg |
2.3 |
* o object = an object name. Used for what follows.
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greg |
2.1 |
* t id1 id2 id3 = a triangle.
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*
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* Only the 't' type results in any output. The others merely set values
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* to be used in generating triangles. If no picture or "p -" is given,
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* there will be no pattern associated with the geometry. If no material
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* or "m -" is given, no material will be associated. (Note that this
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* only makes sense for a mesh which is to be put into an octree for
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* instancing.) Using a pattern requires that each vertex have an
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* associated index value for generating the colorpict primitive.
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greg |
2.3 |
* Likewise, an interpolated surface normal also requires that each
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* vertex of the triangle have an associated normal vector.
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* It is not necessary for the normal vectors to have unit length.
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greg |
2.1 |
*/
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#include "standard.h"
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greg |
2.3 |
#define VOIDID "void" /* this is defined in object.h */
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greg |
2.1 |
#define CALNAME "tmesh.cal" /* the name of our auxiliary file */
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greg |
2.3 |
#define PATNAME "T-pat" /* triangle pattern name (reused) */
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#define TEXNAME "T-nor" /* triangle texture name (reused) */
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greg |
2.1 |
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#define V_DEFINED 01 /* this vertex is defined */
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#define V_HASNORM 02 /* vertex has surface normal */
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#define V_HASINDX 04 /* vertex has index */
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typedef struct {
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short flags; /* vertex flags, from above */
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FVECT pos; /* location */
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FVECT nor; /* normal */
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float ndx[2]; /* picture index */
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} VERTEX;
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VERTEX *vlist = NULL; /* our vertex list */
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int nverts = 0; /* number of vertices in our list */
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typedef FLOAT BARYCCM[3][4];
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greg |
2.3 |
#define novert(i) ((i)<0|(i)>=nverts || !(vlist[i].flags&V_DEFINED))
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greg |
2.1 |
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#define CHUNKSIZ 128 /* vertex allocation chunk size */
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extern VERTEX *vnew(); /* allocate a vertex (never freed) */
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greg |
2.3 |
char *defmat = VOIDID; /* default (starting) material name */
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char *defpat = ""; /* default (starting) picture name */
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char *defobj = "T"; /* default (starting) object name */
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greg |
2.1 |
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greg |
2.3 |
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greg |
2.1 |
main(argc, argv) /* read in T-mesh files and convert */
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int argc;
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char *argv[];
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{
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FILE *fp;
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int i;
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greg |
2.3 |
for (i = 1; i < argc && argv[i][0] == '-'; i++)
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switch (argv[i][1]) {
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case 'o': /* object name */
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defobj = argv[++i];
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break;
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case 'm': /* default material */
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defmat = argv[++i];
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break;
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case 'p': /* default picture */
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defpat = argv[++i];
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break;
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default:
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fprintf(stderr,
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"Usage: %s [-o obj][-m mat][-p pic] [file ..]\n",
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argv[0]);
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exit(1);
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}
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if (i >= argc)
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greg |
2.1 |
convert("<stdin>", stdin);
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else
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greg |
2.3 |
for ( ; i < argc; i++) {
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greg |
2.1 |
if ((fp = fopen(argv[i], "r")) == NULL) {
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perror(argv[i]);
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exit(1);
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}
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convert(argv[i], fp);
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fclose(fp);
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}
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exit(0);
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}
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convert(fname, fp) /* convert a T-mesh */
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char *fname;
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FILE *fp;
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{
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greg |
2.3 |
char typ[4];
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greg |
2.1 |
int id[3];
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double vec[3];
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char picfile[128];
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char matname[64];
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greg |
2.3 |
char objname[64];
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register int i;
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register VERTEX *lastv;
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/* start fresh */
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i = nverts;
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lastv = vlist;
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while (i--)
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(lastv++)->flags = 0;
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lastv = NULL;
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strcpy(picfile, defpat);
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strcpy(matname, defmat);
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strcpy(objname, defobj);
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greg |
2.1 |
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greg |
2.3 |
printf("\n## T-mesh read from: %s\n", fname);
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/* scan until EOF */
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greg |
2.1 |
while (fscanf(fp, "%1s", typ) == 1)
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switch (typ[0]) {
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case 'v': /* vertex */
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if (fscanf(fp, "%d %lf %lf %lf", &id[0],
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&vec[0], &vec[1], &vec[2]) != 4)
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syntax(fname, fp, "Bad vertex");
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lastv = vnew(id[0], vec[0], vec[1], vec[2]);
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break;
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case 't': /* triangle */
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if (fscanf(fp, "%d %d %d", &id[0], &id[1], &id[2]) != 3)
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syntax(fname, fp, "Bad triangle");
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if (novert(id[0]) | novert(id[1]) | novert(id[2]))
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syntax(fname, fp, "Undefined triangle vertex");
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| 146 |
greg |
2.3 |
triangle(picfile, matname, objname, &vlist[id[0]],
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| 147 |
greg |
2.1 |
&vlist[id[1]], &vlist[id[2]]);
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break;
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case 'n': /* surface normal */
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if (lastv == NULL)
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syntax(fname, fp, "No vertex for normal");
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if (fscanf(fp, "%lf %lf %lf",
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&vec[0], &vec[1], &vec[2]) != 3)
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syntax(fname, fp, "Bad vertex normal");
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lastv->nor[0] = vec[0];
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lastv->nor[1] = vec[1];
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lastv->nor[2] = vec[2];
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if (normalize(lastv->nor) == 0.0)
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syntax(fname, fp, "Zero vertex normal");
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lastv->flags |= V_HASNORM;
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break;
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case 'i': /* index position */
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if (lastv == NULL)
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syntax(fname, fp, "No vertex for index");
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if (fscanf(fp, "%lf %lf", &vec[0], &vec[1]) != 2)
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syntax(fname, fp, "Bad index");
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lastv->ndx[0] = vec[0];
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lastv->ndx[1] = vec[1];
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lastv->flags |= V_HASINDX;
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break;
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greg |
2.3 |
case 'o': /* object name */
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if (fscanf(fp, "%s", objname) != 1)
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syntax(fname, fp, "Bad object name");
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break;
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greg |
2.1 |
case 'm': /* material */
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if (fscanf(fp, "%s", matname) != 1)
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syntax(fname, fp, "Bad material");
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if (matname[0] == '-' && !matname[1])
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greg |
2.3 |
strcpy(matname, VOIDID);
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| 180 |
greg |
2.1 |
break;
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| 181 |
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case 'p': /* picture */
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if (fscanf(fp, "%s", picfile) != 1)
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syntax(fname, fp, "Bad pattern");
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| 184 |
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if (picfile[0] == '-' && !picfile[1])
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picfile[0] = '\0';
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break;
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case '#': /* comment */
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greg |
2.3 |
fputs("\n#", stdout);
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while ((i = getc(fp)) != EOF) {
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putchar(i);
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| 191 |
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if (i == '\n')
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break;
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}
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greg |
2.1 |
break;
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default:
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| 196 |
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syntax(fname, fp, "Unknown type");
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break;
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| 198 |
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}
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| 199 |
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}
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| 200 |
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| 201 |
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| 202 |
greg |
2.3 |
triangle(pn, mod, obj, v1, v2, v3) /* put out a triangle */
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| 203 |
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char *pn, *mod, *obj;
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| 204 |
greg |
2.1 |
register VERTEX *v1, *v2, *v3;
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| 205 |
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{
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| 206 |
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static int ntri = 0;
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| 207 |
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BARYCCM bvecs;
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| 208 |
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/* compute barycentric coordinates */
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if (v1->flags & v2->flags & v3->flags & (V_HASINDX|V_HASNORM))
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| 210 |
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if (comp_baryc(bvecs, v1->pos, v2->pos, v3->pos) < 0)
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| 211 |
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return;
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| 212 |
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/* put out texture (if any) */
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| 213 |
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if (v1->flags & v2->flags & v3->flags & V_HASNORM) {
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| 214 |
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printf("\n%s texfunc %s\n", mod, TEXNAME);
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| 215 |
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mod = TEXNAME;
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| 216 |
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printf("4 dx dy dz %s\n", CALNAME);
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| 217 |
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printf("0\n21\n");
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| 218 |
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put_baryc(bvecs);
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| 219 |
greg |
2.2 |
printf("\t%14.12g %14.12g %14.12g\n",
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| 220 |
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v1->nor[0], v2->nor[0], v3->nor[0]);
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| 221 |
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printf("\t%14.12g %14.12g %14.12g\n",
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| 222 |
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v1->nor[1], v2->nor[1], v3->nor[1]);
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| 223 |
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printf("\t%14.12g %14.12g %14.12g\n",
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| 224 |
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v1->nor[2], v2->nor[2], v3->nor[2]);
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| 225 |
greg |
2.1 |
}
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| 226 |
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/* put out pattern (if any) */
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| 227 |
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if (*pn && (v1->flags & v2->flags & v3->flags & V_HASINDX)) {
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| 228 |
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printf("\n%s colorpict %s\n", mod, PATNAME);
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| 229 |
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mod = PATNAME;
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| 230 |
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printf("7 noneg noneg noneg %s %s u v\n", pn, CALNAME);
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| 231 |
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printf("0\n18\n");
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| 232 |
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put_baryc(bvecs);
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| 233 |
greg |
2.2 |
printf("\t%f %f %f\n", v1->ndx[0], v2->ndx[0], v3->ndx[0]);
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| 234 |
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printf("\t%f %f %f\n", v1->ndx[1], v2->ndx[1], v3->ndx[1]);
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| 235 |
greg |
2.1 |
}
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| 236 |
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/* put out triangle */
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| 237 |
greg |
2.3 |
printf("\n%s polygon %s.%d\n", mod, obj, ++ntri);
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| 238 |
greg |
2.1 |
printf("0\n0\n9\n");
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| 239 |
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printf("%18.12g %18.12g %18.12g\n", v1->pos[0],v1->pos[1],v1->pos[2]);
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| 240 |
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printf("%18.12g %18.12g %18.12g\n", v2->pos[0],v2->pos[1],v2->pos[2]);
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| 241 |
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printf("%18.12g %18.12g %18.12g\n", v3->pos[0],v3->pos[1],v3->pos[2]);
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| 242 |
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}
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| 243 |
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| 244 |
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| 245 |
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int
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| 246 |
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comp_baryc(bcm, v1, v2, v3) /* compute barycentric vectors */
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| 247 |
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register BARYCCM bcm;
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| 248 |
greg |
2.3 |
FLOAT *v1, *v2, *v3;
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| 249 |
greg |
2.1 |
{
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| 250 |
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FLOAT *vt;
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| 251 |
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FVECT va, vab, vcb;
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| 252 |
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double d;
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| 253 |
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register int i, j;
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| 254 |
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| 255 |
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for (j = 0; j < 3; j++) {
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| 256 |
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for (i = 0; i < 3; i++) {
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| 257 |
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vab[i] = v1[i] - v2[i];
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| 258 |
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vcb[i] = v3[i] - v2[i];
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| 259 |
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}
|
| 260 |
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d = DOT(vcb,vcb);
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| 261 |
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if (d <= FTINY)
|
| 262 |
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return(-1);
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| 263 |
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d = DOT(vcb,vab)/d;
|
| 264 |
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for (i = 0; i < 3; i++)
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| 265 |
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va[i] = vab[i] - vcb[i]*d;
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| 266 |
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d = DOT(va,va);
|
| 267 |
|
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if (d <= FTINY)
|
| 268 |
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return(-1);
|
| 269 |
|
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for (i = 0; i < 3; i++) {
|
| 270 |
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va[i] /= d;
|
| 271 |
|
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bcm[j][i] = va[i];
|
| 272 |
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}
|
| 273 |
|
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bcm[j][3] = -DOT(v2,va);
|
| 274 |
|
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/* rotate vertices */
|
| 275 |
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vt = v1;
|
| 276 |
|
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v1 = v2;
|
| 277 |
|
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v2 = v3;
|
| 278 |
|
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v3 = vt;
|
| 279 |
|
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}
|
| 280 |
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return(0);
|
| 281 |
|
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}
|
| 282 |
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|
| 283 |
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|
| 284 |
|
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put_baryc(bcm) /* put barycentric coord. vectors */
|
| 285 |
|
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register BARYCCM bcm;
|
| 286 |
|
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{
|
| 287 |
|
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register int i;
|
| 288 |
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|
| 289 |
|
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for (i = 0; i < 3; i++)
|
| 290 |
|
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printf("%14.8f %14.8f %14.8f %14.8f\n",
|
| 291 |
|
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bcm[i][0], bcm[i][1], bcm[i][2], bcm[i][3]);
|
| 292 |
|
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}
|
| 293 |
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|
| 294 |
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| 295 |
|
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VERTEX *
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| 296 |
|
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vnew(id, x, y, z) /* create a new vertex */
|
| 297 |
|
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register int id;
|
| 298 |
|
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double x, y, z;
|
| 299 |
|
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{
|
| 300 |
|
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register int i;
|
| 301 |
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|
| 302 |
|
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if (id > nverts) { /* get some more */
|
| 303 |
|
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i = nverts;
|
| 304 |
|
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nverts = CHUNKSIZ*((id%CHUNKSIZ)+1);
|
| 305 |
|
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if (vlist == NULL)
|
| 306 |
|
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vlist = (VERTEX *)malloc(nverts*sizeof(VERTEX));
|
| 307 |
|
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else
|
| 308 |
|
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vlist = (VERTEX *)realloc((char *)vlist,
|
| 309 |
|
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nverts*sizeof(VERTEX));
|
| 310 |
|
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if (vlist == NULL) {
|
| 311 |
|
|
fprintf(stderr,
|
| 312 |
|
|
"Out of memory while allocating vertex %d\n", id);
|
| 313 |
|
|
exit(1);
|
| 314 |
|
|
}
|
| 315 |
greg |
2.3 |
while (i < nverts) /* clear what's new */
|
| 316 |
greg |
2.1 |
vlist[i++].flags = 0;
|
| 317 |
|
|
}
|
| 318 |
greg |
2.3 |
/* assign new vertex */
|
| 319 |
greg |
2.1 |
vlist[id].pos[0] = x;
|
| 320 |
|
|
vlist[id].pos[1] = y;
|
| 321 |
|
|
vlist[id].pos[2] = z;
|
| 322 |
|
|
vlist[id].flags = V_DEFINED;
|
| 323 |
|
|
/* return it */
|
| 324 |
|
|
return(&vlist[id]);
|
| 325 |
|
|
}
|
| 326 |
|
|
|
| 327 |
|
|
|
| 328 |
|
|
syntax(fn, fp, er) /* report syntax error and exit */
|
| 329 |
|
|
char *fn;
|
| 330 |
|
|
register FILE *fp;
|
| 331 |
|
|
char *er;
|
| 332 |
|
|
{
|
| 333 |
|
|
extern long ftell();
|
| 334 |
|
|
register long cpos;
|
| 335 |
|
|
register int c;
|
| 336 |
|
|
int lineno;
|
| 337 |
|
|
|
| 338 |
|
|
if (fp == stdin)
|
| 339 |
greg |
2.3 |
fprintf(stderr, "%s: T-mesh format error: %s\n", fn, er);
|
| 340 |
greg |
2.1 |
else {
|
| 341 |
|
|
cpos = ftell(fp);
|
| 342 |
|
|
fseek(fp, 0L, 0);
|
| 343 |
|
|
lineno = 1;
|
| 344 |
|
|
while (cpos-- > 0) {
|
| 345 |
|
|
if ((c = getc(fp)) == EOF)
|
| 346 |
|
|
break;
|
| 347 |
|
|
if (c == '\n')
|
| 348 |
|
|
lineno++;
|
| 349 |
|
|
}
|
| 350 |
greg |
2.3 |
fprintf(stderr, "%s: T-mesh format error at line %d: %s\n",
|
| 351 |
greg |
2.1 |
fn, lineno, er);
|
| 352 |
|
|
}
|
| 353 |
|
|
exit(1);
|
| 354 |
|
|
}
|
