1 |
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/* Copyright (c) 1989 Regents of the University of California */ |
2 |
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|
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 |
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 |
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* 4/16/02 Added conditional vertex output |
16 |
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*/ |
17 |
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|
18 |
< |
#include <stdio.h> |
18 |
> |
#include "standard.h" |
19 |
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|
20 |
< |
#define XNAME "X_" /* x function name */ |
21 |
< |
#define YNAME "Y_" /* y function name */ |
22 |
< |
#define ZNAME "Z_" /* z function name */ |
20 |
> |
char XNAME[] = "X`SYS"; /* x function name */ |
21 |
> |
char YNAME[] = "Y`SYS"; /* y function name */ |
22 |
> |
char ZNAME[] = "Z`SYS"; /* z function name */ |
23 |
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|
24 |
< |
#define PI 3.14159265358979323846 |
24 |
> |
char VNAME[] = "valid"; /* valid vertex name */ |
25 |
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|
26 |
< |
#define FTINY 1e-7 |
26 |
> |
#define ABS(x) ((x)>=0 ? (x) : -(x)) |
27 |
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|
28 |
< |
#define vertex(p) printf(vformat, (p)[0], (p)[1], (p)[2]) |
28 |
> |
#define ZEROVECT(v) (DOT(v,v) <= FTINY*FTINY) |
29 |
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|
30 |
+ |
#define pvect(p) printf(vformat, (p)[0], (p)[1], (p)[2]) |
31 |
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|
32 |
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char vformat[] = "%15.9g %15.9g %15.9g\n"; |
33 |
+ |
char tsargs[] = "4 surf_dx surf_dy surf_dz surf.cal\n"; |
34 |
+ |
char texname[] = "Phong"; |
35 |
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|
36 |
< |
double funvalue(), dist2(), fdot(), l_hermite(), argument(); |
36 |
> |
int smooth = 0; /* apply smoothing? */ |
37 |
> |
int objout = 0; /* output .OBJ format? */ |
38 |
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|
39 |
+ |
char *modname, *surfname; |
40 |
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|
41 |
+ |
/* recorded data flags */ |
42 |
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#define HASBORDER 01 |
43 |
+ |
#define TRIPLETS 02 |
44 |
+ |
/* a data structure */ |
45 |
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struct { |
46 |
+ |
int flags; /* data type */ |
47 |
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short m, n; /* number of s and t values */ |
48 |
+ |
FLOAT *data; /* the data itself, s major sort */ |
49 |
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} datarec; /* our recorded data */ |
50 |
+ |
|
51 |
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double l_hermite(), l_bezier(), l_bspline(), l_dataval(); |
52 |
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extern double funvalue(), argument(); |
53 |
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|
54 |
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typedef struct { |
55 |
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int valid; /* point is valid (vertex number) */ |
56 |
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FVECT p; /* vertex position */ |
57 |
+ |
FVECT n; /* average normal */ |
58 |
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FLOAT uv[2]; /* (u,v) position */ |
59 |
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} POINT; |
60 |
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|
61 |
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|
62 |
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main(argc, argv) |
63 |
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int argc; |
64 |
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char *argv[]; |
65 |
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{ |
66 |
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static double *xyz[4]; |
67 |
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double *row0, *row1, *dp; |
42 |
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double v1[3], v2[3], vc1[3], vc2[3]; |
43 |
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double a1, a2; |
66 |
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extern long eclock; |
67 |
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POINT *row0, *row1, *row2, *rp; |
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int i, j, m, n; |
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char stmp[256]; |
46 |
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double d; |
47 |
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register int k; |
70 |
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|
71 |
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varset("PI", PI); |
72 |
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funset("hermite", 5, l_hermite); |
71 |
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varset("PI", ':', PI); |
72 |
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funset("hermite", 5, ':', l_hermite); |
73 |
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funset("bezier", 5, ':', l_bezier); |
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funset("bspline", 5, ':', l_bspline); |
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|
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if (argc < 8) |
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goto userror; |
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|
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for (i = 8; i < argc; i++) |
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if (!strcmp(argv[i], "-e")) |
81 |
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scompile(NULL, argv[++i]); |
81 |
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scompile(argv[++i], NULL, 0); |
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else if (!strcmp(argv[i], "-f")) |
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fcompile(argv[++i]); |
84 |
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else if (!strcmp(argv[i], "-s")) |
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smooth++; |
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else if (!strcmp(argv[i], "-o")) |
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objout++; |
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else |
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goto userror; |
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|
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sprintf(stmp, "%s(s,t)=%s;", XNAME, argv[3]); |
92 |
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scompile(NULL, stmp); |
65 |
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sprintf(stmp, "%s(s,t)=%s;", YNAME, argv[4]); |
66 |
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scompile(NULL, stmp); |
67 |
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sprintf(stmp, "%s(s,t)=%s;", ZNAME, argv[5]); |
68 |
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scompile(NULL, stmp); |
91 |
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modname = argv[1]; |
92 |
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surfname = argv[2]; |
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m = atoi(argv[6]); |
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n = atoi(argv[7]); |
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if (m <= 0 || n <= 0) |
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goto userror; |
97 |
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|
98 |
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row0 = (double *)malloc((n+1)*3*sizeof(double)); |
99 |
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row1 = (double *)malloc((n+1)*3*sizeof(double)); |
100 |
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if (row0 == NULL || row1 == NULL) { |
97 |
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if (!strcmp(argv[5], "-") || access(argv[5], 4) == 0) { /* file? */ |
98 |
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funset(ZNAME, 2, ':', l_dataval); |
99 |
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if (!strcmp(argv[5],argv[3]) && !strcmp(argv[5],argv[4])) { |
100 |
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loaddata(argv[5], m, n, 3); |
101 |
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funset(XNAME, 2, ':', l_dataval); |
102 |
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funset(YNAME, 2, ':', l_dataval); |
103 |
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} else { |
104 |
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loaddata(argv[5], m, n, 1); |
105 |
> |
sprintf(stmp, "%s(s,t)=%s;", XNAME, argv[3]); |
106 |
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scompile(stmp, NULL, 0); |
107 |
> |
sprintf(stmp, "%s(s,t)=%s;", YNAME, argv[4]); |
108 |
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scompile(stmp, NULL, 0); |
109 |
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} |
110 |
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} else { |
111 |
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sprintf(stmp, "%s(s,t)=%s;", XNAME, argv[3]); |
112 |
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scompile(stmp, NULL, 0); |
113 |
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sprintf(stmp, "%s(s,t)=%s;", YNAME, argv[4]); |
114 |
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scompile(stmp, NULL, 0); |
115 |
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sprintf(stmp, "%s(s,t)=%s;", ZNAME, argv[5]); |
116 |
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scompile(stmp, NULL, 0); |
117 |
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} |
118 |
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row0 = (POINT *)malloc((n+3)*sizeof(POINT)); |
119 |
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row1 = (POINT *)malloc((n+3)*sizeof(POINT)); |
120 |
> |
row2 = (POINT *)malloc((n+3)*sizeof(POINT)); |
121 |
> |
if (row0 == NULL || row1 == NULL || row2 == NULL) { |
122 |
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fprintf(stderr, "%s: out of memory\n", argv[0]); |
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quit(1); |
124 |
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} |
125 |
< |
|
125 |
> |
row0++; row1++; row2++; |
126 |
> |
/* print header */ |
127 |
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printhead(argc, argv); |
128 |
< |
|
129 |
< |
comprow(0.0, row1, n); /* compute zeroeth row */ |
130 |
< |
|
128 |
> |
eclock = 0; |
129 |
> |
/* initialize */ |
130 |
> |
comprow(-1.0/m, row0, n); |
131 |
> |
comprow(0.0, row1, n); |
132 |
> |
comprow(1.0/m, row2, n); |
133 |
> |
compnorms(row0, row1, row2, n); |
134 |
> |
if (objout) { |
135 |
> |
printf("\nusemtl %s\n\n", modname); |
136 |
> |
putobjrow(row1, n); |
137 |
> |
} |
138 |
> |
/* for each row */ |
139 |
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for (i = 0; i < m; i++) { |
140 |
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/* compute next row */ |
141 |
< |
dp = row0; |
141 |
> |
rp = row0; |
142 |
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row0 = row1; |
143 |
< |
row1 = dp; |
144 |
< |
comprow((double)(i+1)/m, row1, n); |
143 |
> |
row1 = row2; |
144 |
> |
row2 = rp; |
145 |
> |
comprow((double)(i+2)/m, row2, n); |
146 |
> |
compnorms(row0, row1, row2, n); |
147 |
> |
if (objout) |
148 |
> |
putobjrow(row1, n); |
149 |
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|
150 |
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for (j = 0; j < n; j++) { |
151 |
< |
/* get vertices */ |
152 |
< |
xyz[0] = row0 + 3*j; |
153 |
< |
xyz[1] = row1 + 3*j; |
154 |
< |
xyz[2] = xyz[0] + 3; |
155 |
< |
xyz[3] = xyz[1] + 3; |
156 |
< |
/* rotate vertices */ |
157 |
< |
if (dist2(xyz[0],xyz[3]) < dist2(xyz[1],xyz[2])-FTINY) { |
158 |
< |
dp = xyz[0]; |
159 |
< |
xyz[0] = xyz[1]; |
160 |
< |
xyz[1] = xyz[3]; |
161 |
< |
xyz[3] = xyz[2]; |
162 |
< |
xyz[2] = dp; |
105 |
< |
} |
106 |
< |
/* get normals */ |
107 |
< |
for (k = 0; k < 3; k++) { |
108 |
< |
v1[k] = xyz[1][k] - xyz[0][k]; |
109 |
< |
v2[k] = xyz[2][k] - xyz[0][k]; |
110 |
< |
} |
111 |
< |
fcross(vc1, v1, v2); |
112 |
< |
a1 = fdot(vc1, vc1); |
113 |
< |
for (k = 0; k < 3; k++) { |
114 |
< |
v1[k] = xyz[2][k] - xyz[3][k]; |
115 |
< |
v2[k] = xyz[1][k] - xyz[3][k]; |
116 |
< |
} |
117 |
< |
fcross(vc2, v1, v2); |
118 |
< |
a2 = fdot(vc2, vc2); |
119 |
< |
/* check coplanar */ |
120 |
< |
if (a1 > FTINY*FTINY && a2 > FTINY*FTINY) { |
121 |
< |
d = fdot(vc1, vc2); |
122 |
< |
if (d*d/a1/a2 >= 1.0-FTINY*FTINY) { |
123 |
< |
if (d > 0.0) { /* coplanar */ |
124 |
< |
printf( |
125 |
< |
"\n%s polygon %s.%d.%d\n", |
126 |
< |
argv[1], argv[2], i+1, j+1); |
127 |
< |
printf("0\n0\n12\n"); |
128 |
< |
vertex(xyz[0]); |
129 |
< |
vertex(xyz[1]); |
130 |
< |
vertex(xyz[3]); |
131 |
< |
vertex(xyz[2]); |
132 |
< |
} /* else overlapped */ |
133 |
< |
continue; |
134 |
< |
} /* else bent */ |
135 |
< |
} |
136 |
< |
/* check triangles */ |
137 |
< |
if (a1 > FTINY*FTINY) { |
138 |
< |
printf("\n%s polygon %s.%da%d\n", |
139 |
< |
argv[1], argv[2], i+1, j+1); |
140 |
< |
printf("0\n0\n9\n"); |
141 |
< |
vertex(xyz[0]); |
142 |
< |
vertex(xyz[1]); |
143 |
< |
vertex(xyz[2]); |
144 |
< |
} |
145 |
< |
if (a2 > FTINY*FTINY) { |
146 |
< |
printf("\n%s polygon %s.%db%d\n", |
147 |
< |
argv[1], argv[2], i+1, j+1); |
148 |
< |
printf("0\n0\n9\n"); |
149 |
< |
vertex(xyz[2]); |
150 |
< |
vertex(xyz[1]); |
151 |
< |
vertex(xyz[3]); |
152 |
< |
} |
151 |
> |
int orient = (j & 1); |
152 |
> |
/* put polygons */ |
153 |
> |
if (!(row0[j].valid && row1[j+1].valid)) |
154 |
> |
orient = 1; |
155 |
> |
else if (!(row1[j].valid && row0[j+1].valid)) |
156 |
> |
orient = 0; |
157 |
> |
if (orient) |
158 |
> |
putsquare(&row0[j], &row1[j], |
159 |
> |
&row0[j+1], &row1[j+1]); |
160 |
> |
else |
161 |
> |
putsquare(&row1[j], &row1[j+1], |
162 |
> |
&row0[j], &row0[j+1]); |
163 |
|
} |
164 |
|
} |
165 |
|
|
167 |
|
|
168 |
|
userror: |
169 |
|
fprintf(stderr, "Usage: %s material name ", argv[0]); |
170 |
< |
fprintf(stderr, "x(s,t) y(s,t) z(s,t) m n [-e expr] [-f file]\n"); |
170 |
> |
fprintf(stderr, "x(s,t) y(s,t) z(s,t) m n [-s][-e expr][-f file]\n"); |
171 |
|
quit(1); |
172 |
|
} |
173 |
|
|
174 |
|
|
175 |
+ |
loaddata(file, m, n, pointsize) /* load point data from file */ |
176 |
+ |
char *file; |
177 |
+ |
int m, n; |
178 |
+ |
int pointsize; |
179 |
+ |
{ |
180 |
+ |
FILE *fp; |
181 |
+ |
char word[64]; |
182 |
+ |
register int size; |
183 |
+ |
register FLOAT *dp; |
184 |
+ |
|
185 |
+ |
datarec.flags = HASBORDER; /* assume border values */ |
186 |
+ |
datarec.m = m+1; |
187 |
+ |
datarec.n = n+1; |
188 |
+ |
size = datarec.m*datarec.n*pointsize; |
189 |
+ |
if (pointsize == 3) |
190 |
+ |
datarec.flags |= TRIPLETS; |
191 |
+ |
dp = (FLOAT *)malloc(size*sizeof(FLOAT)); |
192 |
+ |
if ((datarec.data = dp) == NULL) { |
193 |
+ |
fputs("Out of memory\n", stderr); |
194 |
+ |
exit(1); |
195 |
+ |
} |
196 |
+ |
if (!strcmp(file, "-")) { |
197 |
+ |
file = "<stdin>"; |
198 |
+ |
fp = stdin; |
199 |
+ |
} else if ((fp = fopen(file, "r")) == NULL) { |
200 |
+ |
fputs(file, stderr); |
201 |
+ |
fputs(": cannot open\n", stderr); |
202 |
+ |
exit(1); |
203 |
+ |
} |
204 |
+ |
while (size > 0 && fgetword(word, sizeof(word), fp) != NULL) { |
205 |
+ |
if (!isflt(word)) { |
206 |
+ |
fprintf(stderr, "%s: garbled data value: %s\n", |
207 |
+ |
file, word); |
208 |
+ |
exit(1); |
209 |
+ |
} |
210 |
+ |
*dp++ = atof(word); |
211 |
+ |
size--; |
212 |
+ |
} |
213 |
+ |
if (size == (m+n+1)*pointsize) { /* no border after all */ |
214 |
+ |
dp = (FLOAT *)realloc((void *)datarec.data, |
215 |
+ |
m*n*pointsize*sizeof(FLOAT)); |
216 |
+ |
if (dp != NULL) |
217 |
+ |
datarec.data = dp; |
218 |
+ |
datarec.flags &= ~HASBORDER; |
219 |
+ |
datarec.m = m; |
220 |
+ |
datarec.n = n; |
221 |
+ |
size = 0; |
222 |
+ |
} |
223 |
+ |
if (datarec.m < 2 || datarec.n < 2 || size != 0 || |
224 |
+ |
fgetword(word, sizeof(word), fp) != NULL) { |
225 |
+ |
fputs(file, stderr); |
226 |
+ |
fputs(": bad number of data points\n", stderr); |
227 |
+ |
exit(1); |
228 |
+ |
} |
229 |
+ |
fclose(fp); |
230 |
+ |
} |
231 |
+ |
|
232 |
+ |
|
233 |
+ |
double |
234 |
+ |
l_dataval(nam) /* return recorded data value */ |
235 |
+ |
char *nam; |
236 |
+ |
{ |
237 |
+ |
double u, v; |
238 |
+ |
register int i, j; |
239 |
+ |
register FLOAT *dp; |
240 |
+ |
double d00, d01, d10, d11; |
241 |
+ |
/* compute coordinates */ |
242 |
+ |
u = argument(1); v = argument(2); |
243 |
+ |
if (datarec.flags & HASBORDER) { |
244 |
+ |
i = u *= datarec.m-1; |
245 |
+ |
j = v *= datarec.n-1; |
246 |
+ |
} else { |
247 |
+ |
i = u = u*datarec.m - .5; |
248 |
+ |
j = v = v*datarec.n - .5; |
249 |
+ |
} |
250 |
+ |
if (i < 0) i = 0; |
251 |
+ |
else if (i > datarec.m-2) i = datarec.m-2; |
252 |
+ |
if (j < 0) j = 0; |
253 |
+ |
else if (j > datarec.n-2) j = datarec.n-2; |
254 |
+ |
/* compute value */ |
255 |
+ |
if (datarec.flags & TRIPLETS) { |
256 |
+ |
dp = datarec.data + 3*(j*datarec.m + i); |
257 |
+ |
if (nam == ZNAME) |
258 |
+ |
dp += 2; |
259 |
+ |
else if (nam == YNAME) |
260 |
+ |
dp++; |
261 |
+ |
d00 = dp[0]; d01 = dp[3]; |
262 |
+ |
dp += 3*datarec.m; |
263 |
+ |
d10 = dp[0]; d11 = dp[3]; |
264 |
+ |
} else { |
265 |
+ |
dp = datarec.data + j*datarec.m + i; |
266 |
+ |
d00 = dp[0]; d01 = dp[1]; |
267 |
+ |
dp += datarec.m; |
268 |
+ |
d10 = dp[0]; d11 = dp[1]; |
269 |
+ |
} |
270 |
+ |
/* bilinear interpolation */ |
271 |
+ |
return((j+1-v)*((i+1-u)*d00+(u-i)*d01)+(v-j)*((i+1-u)*d10+(u-i)*d11)); |
272 |
+ |
} |
273 |
+ |
|
274 |
+ |
|
275 |
+ |
putobjrow(rp, n) /* output vertex row to .OBJ */ |
276 |
+ |
register POINT *rp; |
277 |
+ |
int n; |
278 |
+ |
{ |
279 |
+ |
static int nverts = 0; |
280 |
+ |
|
281 |
+ |
for ( ; n-- >= 0; rp++) { |
282 |
+ |
if (!rp->valid) |
283 |
+ |
continue; |
284 |
+ |
fputs("v ", stdout); |
285 |
+ |
pvect(rp->p); |
286 |
+ |
if (smooth && !ZEROVECT(rp->n)) |
287 |
+ |
printf("\tvn %.9g %.9g %.9g\n", |
288 |
+ |
rp->n[0], rp->n[1], rp->n[2]); |
289 |
+ |
printf("\tvt %.9g %.9g\n", rp->uv[0], rp->uv[1]); |
290 |
+ |
rp->valid = ++nverts; |
291 |
+ |
} |
292 |
+ |
} |
293 |
+ |
|
294 |
+ |
|
295 |
+ |
putsquare(p0, p1, p2, p3) /* put out a square */ |
296 |
+ |
POINT *p0, *p1, *p2, *p3; |
297 |
+ |
{ |
298 |
+ |
static int nout = 0; |
299 |
+ |
FVECT norm[4]; |
300 |
+ |
int axis; |
301 |
+ |
FVECT v1, v2, vc1, vc2; |
302 |
+ |
int ok1, ok2; |
303 |
+ |
/* compute exact normals */ |
304 |
+ |
ok1 = (p0->valid && p1->valid && p2->valid); |
305 |
+ |
if (ok1) { |
306 |
+ |
VSUB(v1, p1->p, p0->p); |
307 |
+ |
VSUB(v2, p2->p, p0->p); |
308 |
+ |
fcross(vc1, v1, v2); |
309 |
+ |
ok1 = (normalize(vc1) != 0.0); |
310 |
+ |
} |
311 |
+ |
ok2 = (p1->valid && p2->valid && p3->valid); |
312 |
+ |
if (ok2) { |
313 |
+ |
VSUB(v1, p2->p, p3->p); |
314 |
+ |
VSUB(v2, p1->p, p3->p); |
315 |
+ |
fcross(vc2, v1, v2); |
316 |
+ |
ok2 = (normalize(vc2) != 0.0); |
317 |
+ |
} |
318 |
+ |
if (!(ok1 | ok2)) |
319 |
+ |
return; |
320 |
+ |
if (objout) { /* output .OBJ faces */ |
321 |
+ |
int p0n=0, p1n=0, p2n=0, p3n=0; |
322 |
+ |
if (smooth) { |
323 |
+ |
if (!ZEROVECT(p0->n)) |
324 |
+ |
p0n = p0->valid; |
325 |
+ |
if (!ZEROVECT(p1->n)) |
326 |
+ |
p1n = p1->valid; |
327 |
+ |
if (!ZEROVECT(p2->n)) |
328 |
+ |
p2n = p2->valid; |
329 |
+ |
if (!ZEROVECT(p3->n)) |
330 |
+ |
p3n = p3->valid; |
331 |
+ |
} |
332 |
+ |
if (ok1 & ok2 && fdot(vc1,vc2) >= 1.0-FTINY*FTINY) { |
333 |
+ |
printf("f %d/%d/%d %d/%d/%d %d/%d/%d %d/%d/%d\n", |
334 |
+ |
p0->valid, p0->valid, p0n, |
335 |
+ |
p1->valid, p1->valid, p1n, |
336 |
+ |
p3->valid, p3->valid, p3n, |
337 |
+ |
p2->valid, p2->valid, p2n); |
338 |
+ |
return; |
339 |
+ |
} |
340 |
+ |
if (ok1) |
341 |
+ |
printf("f %d/%d/%d %d/%d/%d %d/%d/%d\n", |
342 |
+ |
p0->valid, p0->valid, p0n, |
343 |
+ |
p1->valid, p1->valid, p1n, |
344 |
+ |
p2->valid, p2->valid, p2n); |
345 |
+ |
if (ok2) |
346 |
+ |
printf("f %d/%d/%d %d/%d/%d %d/%d/%d\n", |
347 |
+ |
p2->valid, p2->valid, p2n, |
348 |
+ |
p1->valid, p1->valid, p1n, |
349 |
+ |
p3->valid, p3->valid, p3n); |
350 |
+ |
return; |
351 |
+ |
} |
352 |
+ |
/* compute normal interpolation */ |
353 |
+ |
axis = norminterp(norm, p0, p1, p2, p3); |
354 |
+ |
|
355 |
+ |
/* put out quadrilateral? */ |
356 |
+ |
if (ok1 & ok2 && fdot(vc1,vc2) >= 1.0-FTINY*FTINY) { |
357 |
+ |
printf("\n%s ", modname); |
358 |
+ |
if (axis != -1) { |
359 |
+ |
printf("texfunc %s\n", texname); |
360 |
+ |
printf(tsargs); |
361 |
+ |
printf("0\n13\t%d\n", axis); |
362 |
+ |
pvect(norm[0]); |
363 |
+ |
pvect(norm[1]); |
364 |
+ |
pvect(norm[2]); |
365 |
+ |
fvsum(v1, norm[3], vc1, -0.5); |
366 |
+ |
fvsum(v1, v1, vc2, -0.5); |
367 |
+ |
pvect(v1); |
368 |
+ |
printf("\n%s ", texname); |
369 |
+ |
} |
370 |
+ |
printf("polygon %s.%d\n", surfname, ++nout); |
371 |
+ |
printf("0\n0\n12\n"); |
372 |
+ |
pvect(p0->p); |
373 |
+ |
pvect(p1->p); |
374 |
+ |
pvect(p3->p); |
375 |
+ |
pvect(p2->p); |
376 |
+ |
return; |
377 |
+ |
} |
378 |
+ |
/* put out triangles? */ |
379 |
+ |
if (ok1) { |
380 |
+ |
printf("\n%s ", modname); |
381 |
+ |
if (axis != -1) { |
382 |
+ |
printf("texfunc %s\n", texname); |
383 |
+ |
printf(tsargs); |
384 |
+ |
printf("0\n13\t%d\n", axis); |
385 |
+ |
pvect(norm[0]); |
386 |
+ |
pvect(norm[1]); |
387 |
+ |
pvect(norm[2]); |
388 |
+ |
fvsum(v1, norm[3], vc1, -1.0); |
389 |
+ |
pvect(v1); |
390 |
+ |
printf("\n%s ", texname); |
391 |
+ |
} |
392 |
+ |
printf("polygon %s.%d\n", surfname, ++nout); |
393 |
+ |
printf("0\n0\n9\n"); |
394 |
+ |
pvect(p0->p); |
395 |
+ |
pvect(p1->p); |
396 |
+ |
pvect(p2->p); |
397 |
+ |
} |
398 |
+ |
if (ok2) { |
399 |
+ |
printf("\n%s ", modname); |
400 |
+ |
if (axis != -1) { |
401 |
+ |
printf("texfunc %s\n", texname); |
402 |
+ |
printf(tsargs); |
403 |
+ |
printf("0\n13\t%d\n", axis); |
404 |
+ |
pvect(norm[0]); |
405 |
+ |
pvect(norm[1]); |
406 |
+ |
pvect(norm[2]); |
407 |
+ |
fvsum(v2, norm[3], vc2, -1.0); |
408 |
+ |
pvect(v2); |
409 |
+ |
printf("\n%s ", texname); |
410 |
+ |
} |
411 |
+ |
printf("polygon %s.%d\n", surfname, ++nout); |
412 |
+ |
printf("0\n0\n9\n"); |
413 |
+ |
pvect(p2->p); |
414 |
+ |
pvect(p1->p); |
415 |
+ |
pvect(p3->p); |
416 |
+ |
} |
417 |
+ |
} |
418 |
+ |
|
419 |
+ |
|
420 |
|
comprow(s, row, siz) /* compute row of values */ |
421 |
|
double s; |
422 |
< |
register double *row; |
422 |
> |
register POINT *row; |
423 |
|
int siz; |
424 |
|
{ |
425 |
< |
double st[2], step; |
426 |
< |
|
425 |
> |
double st[2]; |
426 |
> |
int end; |
427 |
> |
int checkvalid; |
428 |
> |
register int i; |
429 |
> |
|
430 |
> |
if (smooth) { |
431 |
> |
i = -1; /* compute one past each end */ |
432 |
> |
end = siz+1; |
433 |
> |
} else { |
434 |
> |
if (s < -FTINY || s > 1.0+FTINY) |
435 |
> |
return; |
436 |
> |
i = 0; |
437 |
> |
end = siz; |
438 |
> |
} |
439 |
|
st[0] = s; |
440 |
< |
st[1] = 0.0; |
441 |
< |
step = 1.0 / siz; |
440 |
> |
checkvalid = (fundefined(VNAME) == 2); |
441 |
> |
while (i <= end) { |
442 |
> |
st[1] = (double)i/siz; |
443 |
> |
if (checkvalid && funvalue(VNAME, 2, st) <= 0.0) { |
444 |
> |
row[i].valid = 0; |
445 |
> |
row[i].p[0] = row[i].p[1] = row[i].p[2] = 0.0; |
446 |
> |
row[i].uv[0] = row[i].uv[1] = 0.0; |
447 |
> |
} else { |
448 |
> |
row[i].valid = 1; |
449 |
> |
row[i].p[0] = funvalue(XNAME, 2, st); |
450 |
> |
row[i].p[1] = funvalue(YNAME, 2, st); |
451 |
> |
row[i].p[2] = funvalue(ZNAME, 2, st); |
452 |
> |
row[i].uv[0] = st[0]; |
453 |
> |
row[i].uv[1] = st[1]; |
454 |
> |
} |
455 |
> |
i++; |
456 |
> |
} |
457 |
> |
} |
458 |
> |
|
459 |
> |
|
460 |
> |
compnorms(r0, r1, r2, siz) /* compute row of averaged normals */ |
461 |
> |
register POINT *r0, *r1, *r2; |
462 |
> |
int siz; |
463 |
> |
{ |
464 |
> |
FVECT v1, v2; |
465 |
> |
|
466 |
> |
if (!smooth) /* not needed if no smoothing */ |
467 |
> |
return; |
468 |
> |
/* compute row 1 normals */ |
469 |
|
while (siz-- >= 0) { |
470 |
< |
*row++ = funvalue(XNAME, 2, st); |
471 |
< |
*row++ = funvalue(YNAME, 2, st); |
472 |
< |
*row++ = funvalue(ZNAME, 2, st); |
473 |
< |
st[1] += step; |
470 |
> |
if (!r1[0].valid) |
471 |
> |
continue; |
472 |
> |
if (!r0[0].valid) { |
473 |
> |
if (!r2[0].valid) { |
474 |
> |
r1[0].n[0] = r1[0].n[1] = r1[0].n[2] = 0.0; |
475 |
> |
continue; |
476 |
> |
} |
477 |
> |
fvsum(v1, r2[0].p, r1[0].p, -1.0); |
478 |
> |
} else if (!r2[0].valid) |
479 |
> |
fvsum(v1, r1[0].p, r0[0].p, -1.0); |
480 |
> |
else |
481 |
> |
fvsum(v1, r2[0].p, r0[0].p, -1.0); |
482 |
> |
if (!r1[-1].valid) { |
483 |
> |
if (!r1[1].valid) { |
484 |
> |
r1[0].n[0] = r1[0].n[1] = r1[0].n[2] = 0.0; |
485 |
> |
continue; |
486 |
> |
} |
487 |
> |
fvsum(v2, r1[1].p, r1[0].p, -1.0); |
488 |
> |
} else if (!r1[1].valid) |
489 |
> |
fvsum(v2, r1[0].p, r1[-1].p, -1.0); |
490 |
> |
else |
491 |
> |
fvsum(v2, r1[1].p, r1[-1].p, -1.0); |
492 |
> |
fcross(r1[0].n, v1, v2); |
493 |
> |
normalize(r1[0].n); |
494 |
> |
r0++; r1++; r2++; |
495 |
|
} |
496 |
|
} |
497 |
|
|
498 |
|
|
499 |
+ |
int |
500 |
+ |
norminterp(resmat, p0, p1, p2, p3) /* compute normal interpolation */ |
501 |
+ |
register FVECT resmat[4]; |
502 |
+ |
POINT *p0, *p1, *p2, *p3; |
503 |
+ |
{ |
504 |
+ |
#define u ((ax+1)%3) |
505 |
+ |
#define v ((ax+2)%3) |
506 |
+ |
|
507 |
+ |
register int ax; |
508 |
+ |
MAT4 eqnmat; |
509 |
+ |
FVECT v1; |
510 |
+ |
register int i, j; |
511 |
+ |
|
512 |
+ |
if (!smooth) /* no interpolation if no smoothing */ |
513 |
+ |
return(-1); |
514 |
+ |
/* find dominant axis */ |
515 |
+ |
VCOPY(v1, p0->n); |
516 |
+ |
fvsum(v1, v1, p1->n, 1.0); |
517 |
+ |
fvsum(v1, v1, p2->n, 1.0); |
518 |
+ |
fvsum(v1, v1, p3->n, 1.0); |
519 |
+ |
ax = ABS(v1[0]) > ABS(v1[1]) ? 0 : 1; |
520 |
+ |
ax = ABS(v1[ax]) > ABS(v1[2]) ? ax : 2; |
521 |
+ |
/* assign equation matrix */ |
522 |
+ |
eqnmat[0][0] = p0->p[u]*p0->p[v]; |
523 |
+ |
eqnmat[0][1] = p0->p[u]; |
524 |
+ |
eqnmat[0][2] = p0->p[v]; |
525 |
+ |
eqnmat[0][3] = 1.0; |
526 |
+ |
eqnmat[1][0] = p1->p[u]*p1->p[v]; |
527 |
+ |
eqnmat[1][1] = p1->p[u]; |
528 |
+ |
eqnmat[1][2] = p1->p[v]; |
529 |
+ |
eqnmat[1][3] = 1.0; |
530 |
+ |
eqnmat[2][0] = p2->p[u]*p2->p[v]; |
531 |
+ |
eqnmat[2][1] = p2->p[u]; |
532 |
+ |
eqnmat[2][2] = p2->p[v]; |
533 |
+ |
eqnmat[2][3] = 1.0; |
534 |
+ |
eqnmat[3][0] = p3->p[u]*p3->p[v]; |
535 |
+ |
eqnmat[3][1] = p3->p[u]; |
536 |
+ |
eqnmat[3][2] = p3->p[v]; |
537 |
+ |
eqnmat[3][3] = 1.0; |
538 |
+ |
/* invert matrix (solve system) */ |
539 |
+ |
if (!invmat4(eqnmat, eqnmat)) |
540 |
+ |
return(-1); /* no solution */ |
541 |
+ |
/* compute result matrix */ |
542 |
+ |
for (j = 0; j < 4; j++) |
543 |
+ |
for (i = 0; i < 3; i++) |
544 |
+ |
resmat[j][i] = eqnmat[j][0]*p0->n[i] + |
545 |
+ |
eqnmat[j][1]*p1->n[i] + |
546 |
+ |
eqnmat[j][2]*p2->n[i] + |
547 |
+ |
eqnmat[j][3]*p3->n[i]; |
548 |
+ |
return(ax); |
549 |
+ |
|
550 |
+ |
#undef u |
551 |
+ |
#undef v |
552 |
+ |
} |
553 |
+ |
|
554 |
+ |
|
555 |
+ |
void |
556 |
|
eputs(msg) |
557 |
|
char *msg; |
558 |
|
{ |
560 |
|
} |
561 |
|
|
562 |
|
|
563 |
+ |
void |
564 |
|
wputs(msg) |
565 |
|
char *msg; |
566 |
|
{ |
568 |
|
} |
569 |
|
|
570 |
|
|
571 |
+ |
void |
572 |
|
quit(code) |
573 |
+ |
int code; |
574 |
|
{ |
575 |
|
exit(code); |
576 |
|
} |
599 |
|
argument(2)*(-2.0*t+3.0)*t*t + |
600 |
|
argument(3)*((t-2.0)*t+1.0)*t + |
601 |
|
argument(4)*(t-1.0)*t*t ); |
602 |
+ |
} |
603 |
+ |
|
604 |
+ |
|
605 |
+ |
double |
606 |
+ |
l_bezier() |
607 |
+ |
{ |
608 |
+ |
double t; |
609 |
+ |
|
610 |
+ |
t = argument(5); |
611 |
+ |
return( argument(1) * (1.+t*(-3.+t*(3.-t))) + |
612 |
+ |
argument(2) * 3.*t*(1.+t*(-2.+t)) + |
613 |
+ |
argument(3) * 3.*t*t*(1.-t) + |
614 |
+ |
argument(4) * t*t*t ); |
615 |
+ |
} |
616 |
+ |
|
617 |
+ |
|
618 |
+ |
double |
619 |
+ |
l_bspline() |
620 |
+ |
{ |
621 |
+ |
double t; |
622 |
+ |
|
623 |
+ |
t = argument(5); |
624 |
+ |
return( argument(1) * (1./6.+t*(-1./2.+t*(1./2.-1./6.*t))) + |
625 |
+ |
argument(2) * (2./3.+t*t*(-1.+1./2.*t)) + |
626 |
+ |
argument(3) * (1./6.+t*(1./2.+t*(1./2.-1./2.*t))) + |
627 |
+ |
argument(4) * (1./6.*t*t*t) ); |
628 |
|
} |