1 |
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#ifndef lint |
2 |
< |
static char SCCSid[] = "$SunId$ LBL"; |
2 |
> |
static const char RCSid[] = "$Id$"; |
3 |
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#endif |
4 |
– |
|
5 |
– |
/* Copyright (c) 1989 Regents of the University of California */ |
6 |
– |
|
4 |
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/* |
5 |
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* gensurf.c - program to generate functional surfaces |
6 |
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* |
11 |
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* rule applied to (s,t). |
12 |
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* |
13 |
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* 4/3/87 |
14 |
+ |
* |
15 |
+ |
* 4/16/02 Added conditional vertex output |
16 |
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*/ |
17 |
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|
18 |
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#include "standard.h" |
19 |
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|
20 |
< |
char XNAME[] = "X`SYS`"; /* x function name */ |
21 |
< |
char YNAME[] = "Y`SYS`"; /* y function name */ |
22 |
< |
char ZNAME[] = "Z`SYS`"; /* z function name */ |
20 |
> |
#include "paths.h" |
21 |
> |
#include "resolu.h" |
22 |
> |
#include "rterror.h" |
23 |
> |
#include "calcomp.h" |
24 |
|
|
25 |
+ |
char XNAME[] = "X`SYS"; /* x function name */ |
26 |
+ |
char YNAME[] = "Y`SYS"; /* y function name */ |
27 |
+ |
char ZNAME[] = "Z`SYS"; /* z function name */ |
28 |
+ |
|
29 |
+ |
char VNAME[] = "valid"; /* valid vertex name */ |
30 |
+ |
|
31 |
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#define ABS(x) ((x)>=0 ? (x) : -(x)) |
32 |
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|
33 |
+ |
#define ZEROVECT(v) (DOT(v,v) <= FTINY*FTINY) |
34 |
+ |
|
35 |
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#define pvect(p) printf(vformat, (p)[0], (p)[1], (p)[2]) |
36 |
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|
37 |
< |
char vformat[] = "%15.9g %15.9g %15.9g\n"; |
38 |
< |
char tsargs[] = "4 surf_dx surf_dy surf_dz surf.cal\n"; |
37 |
> |
char vformat[] = "%18.12g %18.12g %18.12g\n"; |
38 |
> |
char tsargs[] = "4 surf_dx surf_dy surf_dz surf.cal"; |
39 |
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char texname[] = "Phong"; |
40 |
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|
41 |
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int smooth = 0; /* apply smoothing? */ |
42 |
+ |
int objout = 0; /* output .OBJ format? */ |
43 |
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|
44 |
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char *modname, *surfname; |
45 |
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|
50 |
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struct { |
51 |
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int flags; /* data type */ |
52 |
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short m, n; /* number of s and t values */ |
53 |
< |
FLOAT *data; /* the data itself, s major sort */ |
53 |
> |
RREAL *data; /* the data itself, s major sort */ |
54 |
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} datarec; /* our recorded data */ |
55 |
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|
56 |
+ |
/* XXX this is redundant with rt/noise3.c, should go to a library */ |
57 |
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double l_hermite(), l_bezier(), l_bspline(), l_dataval(); |
48 |
– |
extern double funvalue(), argument(); |
58 |
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|
59 |
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typedef struct { |
60 |
+ |
int valid; /* point is valid (vertex number) */ |
61 |
+ |
int nvalid; /* normal is valid */ |
62 |
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FVECT p; /* vertex position */ |
63 |
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FVECT n; /* average normal */ |
64 |
+ |
RREAL uv[2]; /* (u,v) position */ |
65 |
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} POINT; |
66 |
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|
67 |
+ |
int nverts = 0; /* vertex output count */ |
68 |
+ |
int nnorms = 0; /* normal output count */ |
69 |
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|
70 |
+ |
void loaddata(char *file, int m, int n, int pointsize); |
71 |
+ |
double l_dataval(char *nam); |
72 |
+ |
void putobjrow(POINT *rp, int n); |
73 |
+ |
void putobjvert(POINT *p); |
74 |
+ |
void putsquare(POINT *p0, POINT *p1, POINT *p2, POINT *p3); |
75 |
+ |
void comprow(double s, POINT *row, int siz); |
76 |
+ |
void compnorms(POINT *r0, POINT *r1, POINT *r2, int siz); |
77 |
+ |
int norminterp(FVECT resmat[4], POINT *p0, POINT *p1, POINT *p2, POINT *p3); |
78 |
+ |
|
79 |
+ |
|
80 |
+ |
int |
81 |
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main(argc, argv) |
82 |
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int argc; |
83 |
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char *argv[]; |
84 |
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{ |
60 |
– |
extern long eclock; |
85 |
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POINT *row0, *row1, *row2, *rp; |
86 |
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int i, j, m, n; |
87 |
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char stmp[256]; |
88 |
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|
89 |
+ |
esupport |= E_VARIABLE|E_FUNCTION|E_RCONST; |
90 |
+ |
esupport &= ~(E_OUTCHAN|E_INCHAN); |
91 |
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varset("PI", ':', PI); |
92 |
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funset("hermite", 5, ':', l_hermite); |
93 |
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funset("bezier", 5, ':', l_bezier); |
103 |
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fcompile(argv[++i]); |
104 |
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else if (!strcmp(argv[i], "-s")) |
105 |
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smooth++; |
106 |
+ |
else if (!strcmp(argv[i], "-o")) |
107 |
+ |
objout++; |
108 |
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else |
109 |
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goto userror; |
110 |
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|
144 |
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} |
145 |
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row0++; row1++; row2++; |
146 |
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/* print header */ |
147 |
< |
printhead(argc, argv); |
147 |
> |
fputs("# ", stdout); |
148 |
> |
printargs(argc, argv, stdout); |
149 |
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eclock = 0; |
150 |
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/* initialize */ |
151 |
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comprow(-1.0/m, row0, n); |
152 |
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comprow(0.0, row1, n); |
153 |
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comprow(1.0/m, row2, n); |
154 |
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compnorms(row0, row1, row2, n); |
155 |
+ |
if (objout) { |
156 |
+ |
printf("\nusemtl %s\n\n", modname); |
157 |
+ |
putobjrow(row1, n); |
158 |
+ |
} |
159 |
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/* for each row */ |
160 |
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for (i = 0; i < m; i++) { |
161 |
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/* compute next row */ |
165 |
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row2 = rp; |
166 |
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comprow((double)(i+2)/m, row2, n); |
167 |
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compnorms(row0, row1, row2, n); |
168 |
+ |
if (objout) |
169 |
+ |
putobjrow(row1, n); |
170 |
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|
171 |
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for (j = 0; j < n; j++) { |
172 |
+ |
int orient = (j & 1); |
173 |
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/* put polygons */ |
174 |
< |
if ((i+j) & 1) |
174 |
> |
if (!(row0[j].valid && row1[j+1].valid)) |
175 |
> |
orient = 1; |
176 |
> |
else if (!(row1[j].valid && row0[j+1].valid)) |
177 |
> |
orient = 0; |
178 |
> |
if (orient) |
179 |
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putsquare(&row0[j], &row1[j], |
180 |
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&row0[j+1], &row1[j+1]); |
181 |
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else |
184 |
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} |
185 |
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} |
186 |
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|
187 |
< |
quit(0); |
187 |
> |
return 0; |
188 |
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|
189 |
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userror: |
190 |
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fprintf(stderr, "Usage: %s material name ", argv[0]); |
191 |
< |
fprintf(stderr, "x(s,t) y(s,t) z(s,t) m n [-s][-e expr][-f file]\n"); |
192 |
< |
quit(1); |
191 |
> |
fprintf(stderr, "x(s,t) y(s,t) z(s,t) m n [-s][-o][-e expr][-f file]\n"); |
192 |
> |
return 1; |
193 |
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} |
194 |
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|
195 |
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|
196 |
< |
loaddata(file, m, n, pointsize) /* load point data from file */ |
197 |
< |
char *file; |
198 |
< |
int m, n; |
199 |
< |
int pointsize; |
196 |
> |
void |
197 |
> |
loaddata( /* load point data from file */ |
198 |
> |
char *file, |
199 |
> |
int m, |
200 |
> |
int n, |
201 |
> |
int pointsize |
202 |
> |
) |
203 |
|
{ |
161 |
– |
extern char *fgetword(); |
204 |
|
FILE *fp; |
205 |
|
char word[64]; |
206 |
< |
register int size; |
207 |
< |
register FLOAT *dp; |
206 |
> |
int size; |
207 |
> |
RREAL *dp; |
208 |
|
|
209 |
|
datarec.flags = HASBORDER; /* assume border values */ |
210 |
< |
size = (m+1)*(n+1)*pointsize; |
210 |
> |
datarec.m = m+1; |
211 |
> |
datarec.n = n+1; |
212 |
> |
size = datarec.m*datarec.n*pointsize; |
213 |
|
if (pointsize == 3) |
214 |
|
datarec.flags |= TRIPLETS; |
215 |
< |
dp = (FLOAT *)malloc(size*sizeof(FLOAT)); |
215 |
> |
dp = (RREAL *)malloc(size*sizeof(RREAL)); |
216 |
|
if ((datarec.data = dp) == NULL) { |
217 |
|
fputs("Out of memory\n", stderr); |
218 |
|
exit(1); |
235 |
|
size--; |
236 |
|
} |
237 |
|
if (size == (m+n+1)*pointsize) { /* no border after all */ |
238 |
< |
dp = (FLOAT *)realloc((char *)datarec.data, |
239 |
< |
m*n*pointsize*sizeof(FLOAT)); |
238 |
> |
dp = (RREAL *)realloc(datarec.data, |
239 |
> |
m*n*pointsize*sizeof(RREAL)); |
240 |
|
if (dp != NULL) |
241 |
|
datarec.data = dp; |
242 |
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datarec.flags &= ~HASBORDER; |
243 |
+ |
datarec.m = m; |
244 |
+ |
datarec.n = n; |
245 |
|
size = 0; |
246 |
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} |
247 |
< |
if (size || fgetword(word, sizeof(word), fp) != NULL) { |
247 |
> |
if (datarec.m < 2 || datarec.n < 2 || size != 0 || |
248 |
> |
fgetword(word, sizeof(word), fp) != NULL) { |
249 |
|
fputs(file, stderr); |
250 |
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fputs(": bad number of data points\n", stderr); |
251 |
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exit(1); |
255 |
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|
256 |
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|
257 |
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double |
258 |
< |
l_dataval(nam) /* return recorded data value */ |
259 |
< |
char *nam; |
258 |
> |
l_dataval( /* return recorded data value */ |
259 |
> |
char *nam |
260 |
> |
) |
261 |
|
{ |
262 |
|
double u, v; |
263 |
< |
register int i, j; |
264 |
< |
register FLOAT *dp; |
263 |
> |
int i, j; |
264 |
> |
RREAL *dp; |
265 |
|
double d00, d01, d10, d11; |
266 |
|
/* compute coordinates */ |
267 |
|
u = argument(1); v = argument(2); |
268 |
|
if (datarec.flags & HASBORDER) { |
269 |
< |
i = u *= datarec.m; |
270 |
< |
j = v *= datarec.n; |
269 |
> |
i = u *= datarec.m-1; |
270 |
> |
j = v *= datarec.n-1; |
271 |
|
} else { |
272 |
< |
i = u = u*(datarec.m+1) - .5; |
273 |
< |
j = v = v*(datarec.n+1) - .5; |
272 |
> |
i = u = u*datarec.m - .5; |
273 |
> |
j = v = v*datarec.n - .5; |
274 |
|
} |
275 |
|
if (i < 0) i = 0; |
276 |
|
else if (i > datarec.m-2) i = datarec.m-2; |
278 |
|
else if (j > datarec.n-2) j = datarec.n-2; |
279 |
|
/* compute value */ |
280 |
|
if (datarec.flags & TRIPLETS) { |
281 |
< |
dp = datarec.data + 3*(j*datarec.n + i); |
282 |
< |
if (nam == YNAME) |
235 |
< |
dp++; |
236 |
< |
else if (nam == ZNAME) |
281 |
> |
dp = datarec.data + 3*(j*datarec.m + i); |
282 |
> |
if (nam == ZNAME) |
283 |
|
dp += 2; |
284 |
+ |
else if (nam == YNAME) |
285 |
+ |
dp++; |
286 |
|
d00 = dp[0]; d01 = dp[3]; |
287 |
< |
dp += 3*datarec.n; |
287 |
> |
dp += 3*datarec.m; |
288 |
|
d10 = dp[0]; d11 = dp[3]; |
289 |
|
} else { |
290 |
< |
dp = datarec.data + j*datarec.n + i; |
290 |
> |
dp = datarec.data + j*datarec.m + i; |
291 |
|
d00 = dp[0]; d01 = dp[1]; |
292 |
< |
dp += datarec.n; |
292 |
> |
dp += datarec.m; |
293 |
|
d10 = dp[0]; d11 = dp[1]; |
294 |
|
} |
295 |
|
/* bilinear interpolation */ |
297 |
|
} |
298 |
|
|
299 |
|
|
300 |
< |
putsquare(p0, p1, p2, p3) /* put out a square */ |
301 |
< |
POINT *p0, *p1, *p2, *p3; |
300 |
> |
void |
301 |
> |
putobjrow( /* output vertex row to .OBJ */ |
302 |
> |
POINT *rp, |
303 |
> |
int n |
304 |
> |
) |
305 |
|
{ |
306 |
+ |
for ( ; n-- >= 0; rp++) { |
307 |
+ |
if (!rp->valid) |
308 |
+ |
continue; |
309 |
+ |
fputs("v ", stdout); |
310 |
+ |
pvect(rp->p); |
311 |
+ |
if (smooth && !ZEROVECT(rp->n)) { |
312 |
+ |
printf("\tvn %.9g %.9g %.9g\n", |
313 |
+ |
rp->n[0], rp->n[1], rp->n[2]); |
314 |
+ |
rp->nvalid = ++nnorms; |
315 |
+ |
} else |
316 |
+ |
rp->nvalid = 0; |
317 |
+ |
printf("\tvt %.9g %.9g\n", rp->uv[0], rp->uv[1]); |
318 |
+ |
rp->valid = ++nverts; |
319 |
+ |
} |
320 |
+ |
} |
321 |
+ |
|
322 |
+ |
|
323 |
+ |
void |
324 |
+ |
putobjvert( /* put out OBJ vertex index triplet */ |
325 |
+ |
POINT *p |
326 |
+ |
) |
327 |
+ |
{ |
328 |
+ |
int pti = p->valid ? p->valid-nverts-1 : 0; |
329 |
+ |
int ni = p->nvalid ? p->nvalid-nnorms-1 : 0; |
330 |
+ |
|
331 |
+ |
printf(" %d/%d/%d", pti, pti, ni); |
332 |
+ |
} |
333 |
+ |
|
334 |
+ |
|
335 |
+ |
void |
336 |
+ |
putsquare( /* put out a square */ |
337 |
+ |
POINT *p0, |
338 |
+ |
POINT *p1, |
339 |
+ |
POINT *p2, |
340 |
+ |
POINT *p3 |
341 |
+ |
) |
342 |
+ |
{ |
343 |
|
static int nout = 0; |
344 |
|
FVECT norm[4]; |
345 |
|
int axis; |
346 |
|
FVECT v1, v2, vc1, vc2; |
347 |
|
int ok1, ok2; |
348 |
|
/* compute exact normals */ |
349 |
< |
fvsum(v1, p1->p, p0->p, -1.0); |
350 |
< |
fvsum(v2, p2->p, p0->p, -1.0); |
351 |
< |
fcross(vc1, v1, v2); |
352 |
< |
ok1 = normalize(vc1) != 0.0; |
353 |
< |
fvsum(v1, p2->p, p3->p, -1.0); |
354 |
< |
fvsum(v2, p1->p, p3->p, -1.0); |
355 |
< |
fcross(vc2, v1, v2); |
356 |
< |
ok2 = normalize(vc2) != 0.0; |
349 |
> |
ok1 = (p0->valid && p1->valid && p2->valid); |
350 |
> |
if (ok1) { |
351 |
> |
VSUB(v1, p1->p, p0->p); |
352 |
> |
VSUB(v2, p2->p, p0->p); |
353 |
> |
fcross(vc1, v1, v2); |
354 |
> |
ok1 = (normalize(vc1) != 0.0); |
355 |
> |
} |
356 |
> |
ok2 = (p1->valid && p2->valid && p3->valid); |
357 |
> |
if (ok2) { |
358 |
> |
VSUB(v1, p2->p, p3->p); |
359 |
> |
VSUB(v2, p1->p, p3->p); |
360 |
> |
fcross(vc2, v1, v2); |
361 |
> |
ok2 = (normalize(vc2) != 0.0); |
362 |
> |
} |
363 |
|
if (!(ok1 | ok2)) |
364 |
|
return; |
365 |
+ |
if (objout) { /* output .OBJ faces */ |
366 |
+ |
if (ok1 & ok2 && fdot(vc1,vc2) >= 1.0-FTINY*FTINY) { |
367 |
+ |
putc('f', stdout); |
368 |
+ |
putobjvert(p0); putobjvert(p1); |
369 |
+ |
putobjvert(p3); putobjvert(p2); |
370 |
+ |
putc('\n', stdout); |
371 |
+ |
return; |
372 |
+ |
} |
373 |
+ |
if (ok1) { |
374 |
+ |
putc('f', stdout); |
375 |
+ |
putobjvert(p0); putobjvert(p1); putobjvert(p2); |
376 |
+ |
putc('\n', stdout); |
377 |
+ |
} |
378 |
+ |
if (ok2) { |
379 |
+ |
putc('f', stdout); |
380 |
+ |
putobjvert(p2); putobjvert(p1); putobjvert(p3); |
381 |
+ |
putc('\n', stdout); |
382 |
+ |
} |
383 |
+ |
return; |
384 |
+ |
} |
385 |
|
/* compute normal interpolation */ |
386 |
|
axis = norminterp(norm, p0, p1, p2, p3); |
387 |
|
|
389 |
|
if (ok1 & ok2 && fdot(vc1,vc2) >= 1.0-FTINY*FTINY) { |
390 |
|
printf("\n%s ", modname); |
391 |
|
if (axis != -1) { |
392 |
< |
printf("texfunc %s\n", texname); |
279 |
< |
printf(tsargs); |
392 |
> |
printf("texfunc %s\n%s\n", texname, tsargs); |
393 |
|
printf("0\n13\t%d\n", axis); |
394 |
|
pvect(norm[0]); |
395 |
|
pvect(norm[1]); |
411 |
|
if (ok1) { |
412 |
|
printf("\n%s ", modname); |
413 |
|
if (axis != -1) { |
414 |
< |
printf("texfunc %s\n", texname); |
302 |
< |
printf(tsargs); |
414 |
> |
printf("texfunc %s\n%s\n", texname, tsargs); |
415 |
|
printf("0\n13\t%d\n", axis); |
416 |
|
pvect(norm[0]); |
417 |
|
pvect(norm[1]); |
429 |
|
if (ok2) { |
430 |
|
printf("\n%s ", modname); |
431 |
|
if (axis != -1) { |
432 |
< |
printf("texfunc %s\n", texname); |
321 |
< |
printf(tsargs); |
432 |
> |
printf("texfunc %s\n%s\n", texname, tsargs); |
433 |
|
printf("0\n13\t%d\n", axis); |
434 |
|
pvect(norm[0]); |
435 |
|
pvect(norm[1]); |
447 |
|
} |
448 |
|
|
449 |
|
|
450 |
< |
comprow(s, row, siz) /* compute row of values */ |
451 |
< |
double s; |
452 |
< |
register POINT *row; |
453 |
< |
int siz; |
450 |
> |
void |
451 |
> |
comprow( /* compute row of values */ |
452 |
> |
double s, |
453 |
> |
POINT *row, |
454 |
> |
int siz |
455 |
> |
) |
456 |
|
{ |
457 |
|
double st[2]; |
458 |
|
int end; |
459 |
< |
register int i; |
459 |
> |
int checkvalid; |
460 |
> |
int i; |
461 |
|
|
462 |
|
if (smooth) { |
463 |
|
i = -1; /* compute one past each end */ |
469 |
|
end = siz; |
470 |
|
} |
471 |
|
st[0] = s; |
472 |
+ |
checkvalid = (fundefined(VNAME) == 2); |
473 |
|
while (i <= end) { |
474 |
|
st[1] = (double)i/siz; |
475 |
< |
row[i].p[0] = funvalue(XNAME, 2, st); |
476 |
< |
row[i].p[1] = funvalue(YNAME, 2, st); |
477 |
< |
row[i].p[2] = funvalue(ZNAME, 2, st); |
475 |
> |
if (checkvalid && funvalue(VNAME, 2, st) <= 0.0) { |
476 |
> |
row[i].valid = 0; |
477 |
> |
row[i].p[0] = row[i].p[1] = row[i].p[2] = 0.0; |
478 |
> |
row[i].uv[0] = row[i].uv[1] = 0.0; |
479 |
> |
} else { |
480 |
> |
row[i].valid = 1; |
481 |
> |
row[i].p[0] = funvalue(XNAME, 2, st); |
482 |
> |
row[i].p[1] = funvalue(YNAME, 2, st); |
483 |
> |
row[i].p[2] = funvalue(ZNAME, 2, st); |
484 |
> |
row[i].uv[0] = st[0]; |
485 |
> |
row[i].uv[1] = st[1]; |
486 |
> |
} |
487 |
|
i++; |
488 |
|
} |
489 |
|
} |
490 |
|
|
491 |
|
|
492 |
< |
compnorms(r0, r1, r2, siz) /* compute row of averaged normals */ |
493 |
< |
register POINT *r0, *r1, *r2; |
494 |
< |
int siz; |
492 |
> |
void |
493 |
> |
compnorms( /* compute row of averaged normals */ |
494 |
> |
POINT *r0, |
495 |
> |
POINT *r1, |
496 |
> |
POINT *r2, |
497 |
> |
int siz |
498 |
> |
) |
499 |
|
{ |
500 |
|
FVECT v1, v2; |
373 |
– |
register int i; |
501 |
|
|
502 |
|
if (!smooth) /* not needed if no smoothing */ |
503 |
|
return; |
504 |
< |
/* compute middle points */ |
504 |
> |
/* compute row 1 normals */ |
505 |
|
while (siz-- >= 0) { |
506 |
< |
fvsum(v1, r2[0].p, r0[0].p, -1.0); |
507 |
< |
fvsum(v2, r1[1].p, r1[-1].p, -1.0); |
506 |
> |
if (!r1[0].valid) |
507 |
> |
continue; |
508 |
> |
if (!r0[0].valid) { |
509 |
> |
if (!r2[0].valid) { |
510 |
> |
r1[0].n[0] = r1[0].n[1] = r1[0].n[2] = 0.0; |
511 |
> |
continue; |
512 |
> |
} |
513 |
> |
fvsum(v1, r2[0].p, r1[0].p, -1.0); |
514 |
> |
} else if (!r2[0].valid) |
515 |
> |
fvsum(v1, r1[0].p, r0[0].p, -1.0); |
516 |
> |
else |
517 |
> |
fvsum(v1, r2[0].p, r0[0].p, -1.0); |
518 |
> |
if (!r1[-1].valid) { |
519 |
> |
if (!r1[1].valid) { |
520 |
> |
r1[0].n[0] = r1[0].n[1] = r1[0].n[2] = 0.0; |
521 |
> |
continue; |
522 |
> |
} |
523 |
> |
fvsum(v2, r1[1].p, r1[0].p, -1.0); |
524 |
> |
} else if (!r1[1].valid) |
525 |
> |
fvsum(v2, r1[0].p, r1[-1].p, -1.0); |
526 |
> |
else |
527 |
> |
fvsum(v2, r1[1].p, r1[-1].p, -1.0); |
528 |
|
fcross(r1[0].n, v1, v2); |
529 |
|
normalize(r1[0].n); |
530 |
|
r0++; r1++; r2++; |
533 |
|
|
534 |
|
|
535 |
|
int |
536 |
< |
norminterp(resmat, p0, p1, p2, p3) /* compute normal interpolation */ |
537 |
< |
register FVECT resmat[4]; |
538 |
< |
POINT *p0, *p1, *p2, *p3; |
536 |
> |
norminterp( /* compute normal interpolation */ |
537 |
> |
FVECT resmat[4], |
538 |
> |
POINT *p0, |
539 |
> |
POINT *p1, |
540 |
> |
POINT *p2, |
541 |
> |
POINT *p3 |
542 |
> |
) |
543 |
|
{ |
544 |
|
#define u ((ax+1)%3) |
545 |
|
#define v ((ax+2)%3) |
546 |
|
|
547 |
< |
register int ax; |
547 |
> |
int ax; |
548 |
|
MAT4 eqnmat; |
549 |
|
FVECT v1; |
550 |
< |
register int i, j; |
550 |
> |
int i, j; |
551 |
|
|
552 |
|
if (!smooth) /* no interpolation if no smoothing */ |
553 |
|
return(-1); |
576 |
|
eqnmat[3][2] = p3->p[v]; |
577 |
|
eqnmat[3][3] = 1.0; |
578 |
|
/* invert matrix (solve system) */ |
579 |
< |
if (!invmat(eqnmat, eqnmat)) |
579 |
> |
if (!invmat4(eqnmat, eqnmat)) |
580 |
|
return(-1); /* no solution */ |
581 |
|
/* compute result matrix */ |
582 |
|
for (j = 0; j < 4; j++) |
592 |
|
} |
593 |
|
|
594 |
|
|
444 |
– |
/* |
445 |
– |
* invmat - computes the inverse of mat into inverse. Returns 1 |
446 |
– |
* if there exists an inverse, 0 otherwise. It uses Gaussian Elimination |
447 |
– |
* method. |
448 |
– |
*/ |
449 |
– |
|
450 |
– |
invmat(inverse,mat) |
451 |
– |
MAT4 inverse, mat; |
452 |
– |
{ |
453 |
– |
#define SWAP(a,b,t) (t=a,a=b,b=t) |
454 |
– |
|
455 |
– |
MAT4 m4tmp; |
456 |
– |
register int i,j,k; |
457 |
– |
register double temp; |
458 |
– |
|
459 |
– |
copymat4(m4tmp, mat); |
460 |
– |
/* set inverse to identity */ |
461 |
– |
for (i = 0; i < 4; i++) |
462 |
– |
for (j = 0; j < 4; j++) |
463 |
– |
inverse[i][j] = i==j ? 1.0 : 0.0; |
464 |
– |
|
465 |
– |
for(i = 0; i < 4; i++) { |
466 |
– |
/* Look for row with largest pivot and swap rows */ |
467 |
– |
temp = FTINY; j = -1; |
468 |
– |
for(k = i; k < 4; k++) |
469 |
– |
if(ABS(m4tmp[k][i]) > temp) { |
470 |
– |
temp = ABS(m4tmp[k][i]); |
471 |
– |
j = k; |
472 |
– |
} |
473 |
– |
if(j == -1) /* No replacing row -> no inverse */ |
474 |
– |
return(0); |
475 |
– |
if (j != i) |
476 |
– |
for(k = 0; k < 4; k++) { |
477 |
– |
SWAP(m4tmp[i][k],m4tmp[j][k],temp); |
478 |
– |
SWAP(inverse[i][k],inverse[j][k],temp); |
479 |
– |
} |
480 |
– |
|
481 |
– |
temp = m4tmp[i][i]; |
482 |
– |
for(k = 0; k < 4; k++) { |
483 |
– |
m4tmp[i][k] /= temp; |
484 |
– |
inverse[i][k] /= temp; |
485 |
– |
} |
486 |
– |
for(j = 0; j < 4; j++) { |
487 |
– |
if(j != i) { |
488 |
– |
temp = m4tmp[j][i]; |
489 |
– |
for(k = 0; k < 4; k++) { |
490 |
– |
m4tmp[j][k] -= m4tmp[i][k]*temp; |
491 |
– |
inverse[j][k] -= inverse[i][k]*temp; |
492 |
– |
} |
493 |
– |
} |
494 |
– |
} |
495 |
– |
} |
496 |
– |
return(1); |
497 |
– |
|
498 |
– |
#undef SWAP |
499 |
– |
} |
500 |
– |
|
501 |
– |
|
502 |
– |
eputs(msg) |
503 |
– |
char *msg; |
504 |
– |
{ |
505 |
– |
fputs(msg, stderr); |
506 |
– |
} |
507 |
– |
|
508 |
– |
|
509 |
– |
wputs(msg) |
510 |
– |
char *msg; |
511 |
– |
{ |
512 |
– |
eputs(msg); |
513 |
– |
} |
514 |
– |
|
515 |
– |
|
516 |
– |
quit(code) |
517 |
– |
{ |
518 |
– |
exit(code); |
519 |
– |
} |
520 |
– |
|
521 |
– |
|
522 |
– |
printhead(ac, av) /* print command header */ |
523 |
– |
register int ac; |
524 |
– |
register char **av; |
525 |
– |
{ |
526 |
– |
putchar('#'); |
527 |
– |
while (ac--) { |
528 |
– |
putchar(' '); |
529 |
– |
fputs(*av++, stdout); |
530 |
– |
} |
531 |
– |
putchar('\n'); |
532 |
– |
} |
533 |
– |
|
534 |
– |
|
595 |
|
double |
596 |
< |
l_hermite() |
596 |
> |
l_hermite(char *nm) |
597 |
|
{ |
598 |
|
double t; |
599 |
|
|
606 |
|
|
607 |
|
|
608 |
|
double |
609 |
< |
l_bezier() |
609 |
> |
l_bezier(char *nm) |
610 |
|
{ |
611 |
|
double t; |
612 |
|
|
619 |
|
|
620 |
|
|
621 |
|
double |
622 |
< |
l_bspline() |
622 |
> |
l_bspline(char *nm) |
623 |
|
{ |
624 |
|
double t; |
625 |
|
|