21 |
|
setview(v) /* set hvec and vvec, return message on error */ |
22 |
|
register VIEW *v; |
23 |
|
{ |
24 |
< |
extern double tan(), normalize(); |
25 |
< |
|
24 |
> |
static char ill_horiz[] = "illegal horizontal view size"; |
25 |
> |
static char ill_vert[] = "illegal vertical view size"; |
26 |
> |
|
27 |
|
if (normalize(v->vdir) == 0.0) /* normalize direction */ |
28 |
|
return("zero view direction"); |
29 |
|
|
34 |
|
|
35 |
|
fcross(v->vvec, v->hvec, v->vdir); /* compute vert dir */ |
36 |
|
|
37 |
< |
if (v->type == VT_PAR) |
37 |
> |
if (v->horiz <= FTINY) |
38 |
> |
return(ill_horiz); |
39 |
> |
if (v->vert <= FTINY) |
40 |
> |
return(ill_vert); |
41 |
> |
|
42 |
> |
switch (v->type) { |
43 |
> |
case VT_PAR: /* parallel view */ |
44 |
|
v->hn2 = v->horiz; |
45 |
< |
else if (v->type == VT_PER) |
45 |
> |
v->vn2 = v->vert; |
46 |
> |
break; |
47 |
> |
case VT_PER: /* perspective view */ |
48 |
> |
if (v->horiz >= 180.0-FTINY) |
49 |
> |
return(ill_horiz); |
50 |
> |
if (v->vert >= 180.0-FTINY) |
51 |
> |
return(ill_vert); |
52 |
|
v->hn2 = 2.0 * tan(v->horiz*(PI/180.0/2.0)); |
53 |
< |
else |
53 |
> |
v->vn2 = 2.0 * tan(v->vert*(PI/180.0/2.0)); |
54 |
> |
break; |
55 |
> |
case VT_ANG: /* angular fisheye */ |
56 |
> |
if (v->horiz > 360.0+FTINY) |
57 |
> |
return(ill_horiz); |
58 |
> |
if (v->vert > 360.0+FTINY) |
59 |
> |
return(ill_vert); |
60 |
> |
v->hn2 = v->horiz / 90.0; |
61 |
> |
v->vn2 = v->vert / 90.0; |
62 |
> |
break; |
63 |
> |
case VT_HEM: /* hemispherical fisheye */ |
64 |
> |
if (v->horiz > 180.0+FTINY) |
65 |
> |
return(ill_horiz); |
66 |
> |
if (v->vert > 180.0+FTINY) |
67 |
> |
return(ill_vert); |
68 |
> |
v->hn2 = 2.0 * sin(v->horiz*(PI/180.0/2.0)); |
69 |
> |
v->vn2 = 2.0 * sin(v->vert*(PI/180.0/2.0)); |
70 |
> |
break; |
71 |
> |
default: |
72 |
|
return("unknown view type"); |
73 |
< |
|
74 |
< |
if (v->hn2 <= FTINY || v->hn2 >= FHUGE) |
75 |
< |
return("illegal horizontal view size"); |
76 |
< |
|
77 |
< |
v->hvec[0] *= v->hn2; |
78 |
< |
v->hvec[1] *= v->hn2; |
79 |
< |
v->hvec[2] *= v->hn2; |
73 |
> |
} |
74 |
> |
if (v->type == VT_PAR || v->type == VT_PER) { |
75 |
> |
v->hvec[0] *= v->hn2; |
76 |
> |
v->hvec[1] *= v->hn2; |
77 |
> |
v->hvec[2] *= v->hn2; |
78 |
> |
v->vvec[0] *= v->vn2; |
79 |
> |
v->vvec[1] *= v->vn2; |
80 |
> |
v->vvec[2] *= v->vn2; |
81 |
> |
} |
82 |
|
v->hn2 *= v->hn2; |
50 |
– |
|
51 |
– |
if (v->type == VT_PAR) |
52 |
– |
v->vn2 = v->vert; |
53 |
– |
else |
54 |
– |
v->vn2 = 2.0 * tan(v->vert*(PI/180.0/2.0)); |
55 |
– |
|
56 |
– |
if (v->vn2 <= FTINY || v->vn2 >= FHUGE) |
57 |
– |
return("illegal vertical view size"); |
58 |
– |
|
59 |
– |
v->vvec[0] *= v->vn2; |
60 |
– |
v->vvec[1] *= v->vn2; |
61 |
– |
v->vvec[2] *= v->vn2; |
83 |
|
v->vn2 *= v->vn2; |
84 |
|
|
85 |
|
return(NULL); |
86 |
|
} |
87 |
|
|
88 |
|
|
89 |
+ |
normaspect(va, ap, xp, yp) /* fix pixel aspect or resolution */ |
90 |
+ |
double va; /* view aspect ratio */ |
91 |
+ |
double *ap; /* pixel aspect in (or out if 0) */ |
92 |
+ |
int *xp, *yp; /* x and y resolution in (or out if *ap!=0) */ |
93 |
+ |
{ |
94 |
+ |
if (*ap <= FTINY) |
95 |
+ |
*ap = va * *xp / *yp; /* compute pixel aspect */ |
96 |
+ |
else if (va * *xp > *ap * *yp) |
97 |
+ |
*xp = *yp / va * *ap + .5; /* reduce x resolution */ |
98 |
+ |
else |
99 |
+ |
*yp = *xp * va / *ap + .5; /* reduce y resolution */ |
100 |
+ |
} |
101 |
+ |
|
102 |
+ |
|
103 |
|
viewray(orig, direc, v, x, y) /* compute ray origin and direction */ |
104 |
|
FVECT orig, direc; |
105 |
|
register VIEW *v; |
106 |
|
double x, y; |
107 |
|
{ |
108 |
+ |
double d, z; |
109 |
+ |
|
110 |
|
x += v->hoff - 0.5; |
111 |
|
y += v->voff - 0.5; |
112 |
|
|
113 |
< |
if (v->type == VT_PAR) { /* parallel view */ |
113 |
> |
switch(v->type) { |
114 |
> |
case VT_PAR: /* parallel view */ |
115 |
|
orig[0] = v->vp[0] + x*v->hvec[0] + y*v->vvec[0]; |
116 |
|
orig[1] = v->vp[1] + x*v->hvec[1] + y*v->vvec[1]; |
117 |
|
orig[2] = v->vp[2] + x*v->hvec[2] + y*v->vvec[2]; |
118 |
|
VCOPY(direc, v->vdir); |
119 |
< |
} else { /* perspective view */ |
119 |
> |
return(0); |
120 |
> |
case VT_PER: /* perspective view */ |
121 |
|
VCOPY(orig, v->vp); |
122 |
|
direc[0] = v->vdir[0] + x*v->hvec[0] + y*v->vvec[0]; |
123 |
|
direc[1] = v->vdir[1] + x*v->hvec[1] + y*v->vvec[1]; |
124 |
|
direc[2] = v->vdir[2] + x*v->hvec[2] + y*v->vvec[2]; |
125 |
|
normalize(direc); |
126 |
+ |
return(0); |
127 |
+ |
case VT_HEM: /* hemispherical fisheye */ |
128 |
+ |
x *= v->horiz/90.0; |
129 |
+ |
y *= v->vert/90.0; |
130 |
+ |
z = 1.0 - x*x - y*y; |
131 |
+ |
if (z < 0.0) |
132 |
+ |
return(-1); |
133 |
+ |
z = sqrt(z); |
134 |
+ |
VCOPY(orig, v->vp); |
135 |
+ |
direc[0] = z*v->vdir[0] + x*v->hvec[0] + y*v->vvec[0]; |
136 |
+ |
direc[1] = z*v->vdir[1] + x*v->hvec[1] + y*v->vvec[1]; |
137 |
+ |
direc[2] = z*v->vdir[2] + x*v->hvec[2] + y*v->vvec[2]; |
138 |
+ |
return(0); |
139 |
+ |
case VT_ANG: /* angular fisheye */ |
140 |
+ |
x *= v->horiz/180.0; |
141 |
+ |
y *= v->vert/180.0; |
142 |
+ |
d = x*x + y*y; |
143 |
+ |
if (d > 1.0) |
144 |
+ |
return(-1); |
145 |
+ |
VCOPY(orig, v->vp); |
146 |
+ |
if (d <= FTINY) { |
147 |
+ |
VCOPY(direc, v->vdir); |
148 |
+ |
return(0); |
149 |
+ |
} |
150 |
+ |
d = sqrt(d); |
151 |
+ |
z = cos(PI*d); |
152 |
+ |
d = sqrt(1 - z*z)/d; |
153 |
+ |
x *= d; |
154 |
+ |
y *= d; |
155 |
+ |
direc[0] = z*v->vdir[0] + x*v->hvec[0] + y*v->vvec[0]; |
156 |
+ |
direc[1] = z*v->vdir[1] + x*v->hvec[1] + y*v->vvec[1]; |
157 |
+ |
direc[2] = z*v->vdir[2] + x*v->hvec[2] + y*v->vvec[2]; |
158 |
+ |
return(0); |
159 |
|
} |
160 |
+ |
return(-1); |
161 |
|
} |
162 |
|
|
163 |
|
|
166 |
|
register VIEW *v; |
167 |
|
FVECT p; |
168 |
|
{ |
96 |
– |
extern double sqrt(); |
169 |
|
double d; |
170 |
|
FVECT disp; |
171 |
|
|
173 |
|
disp[1] = p[1] - v->vp[1]; |
174 |
|
disp[2] = p[2] - v->vp[2]; |
175 |
|
|
176 |
< |
if (v->type == VT_PAR) { /* parallel view */ |
176 |
> |
switch (v->type) { |
177 |
> |
case VT_PAR: /* parallel view */ |
178 |
|
if (zp != NULL) |
179 |
|
*zp = DOT(disp,v->vdir); |
180 |
< |
} else { /* perspective view */ |
181 |
< |
d = 1.0/DOT(disp,v->vdir); |
180 |
> |
*xp = DOT(disp,v->hvec)/v->hn2 + 0.5 - v->hoff; |
181 |
> |
*yp = DOT(disp,v->vvec)/v->vn2 + 0.5 - v->voff; |
182 |
> |
return; |
183 |
> |
case VT_PER: /* perspective view */ |
184 |
> |
d = DOT(disp,v->vdir); |
185 |
|
if (zp != NULL) { |
186 |
|
*zp = sqrt(DOT(disp,disp)); |
187 |
|
if (d < 0.0) |
188 |
|
*zp = -*zp; |
189 |
|
} |
190 |
< |
disp[0] *= d; |
191 |
< |
disp[1] *= d; |
192 |
< |
disp[2] *= d; |
190 |
> |
if (d < 0.0) /* fold pyramid */ |
191 |
> |
d = -d; |
192 |
> |
if (d > FTINY) { |
193 |
> |
d = 1.0/d; |
194 |
> |
disp[0] *= d; |
195 |
> |
disp[1] *= d; |
196 |
> |
disp[2] *= d; |
197 |
> |
} |
198 |
> |
*xp = DOT(disp,v->hvec)/v->hn2 + 0.5 - v->hoff; |
199 |
> |
*yp = DOT(disp,v->vvec)/v->vn2 + 0.5 - v->voff; |
200 |
> |
return; |
201 |
> |
case VT_HEM: /* hemispherical fisheye */ |
202 |
> |
d = normalize(disp); |
203 |
> |
if (zp != NULL) { |
204 |
> |
if (DOT(disp,v->vdir) < 0.0) |
205 |
> |
*zp = -d; |
206 |
> |
else |
207 |
> |
*zp = d; |
208 |
> |
} |
209 |
> |
*xp = DOT(disp,v->hvec)*90.0/v->horiz + 0.5 - v->hoff; |
210 |
> |
*yp = DOT(disp,v->vvec)*90.0/v->vert + 0.5 - v->voff; |
211 |
> |
return; |
212 |
> |
case VT_ANG: /* angular fisheye */ |
213 |
> |
d = normalize(disp); |
214 |
> |
if (zp != NULL) |
215 |
> |
*zp = d; |
216 |
> |
*xp = 0.5 - v->hoff; |
217 |
> |
*yp = 0.5 - v->voff; |
218 |
> |
d = DOT(disp,v->vdir); |
219 |
> |
if (d >= 1.0-FTINY) |
220 |
> |
return; |
221 |
> |
if (d <= -(1.0-FTINY)) { |
222 |
> |
*xp += 180.0/v->horiz; |
223 |
> |
*yp += 180.0/v->vert; |
224 |
> |
return; |
225 |
> |
} |
226 |
> |
d = acos(d)/PI / sqrt(1.0 - d*d); |
227 |
> |
*xp += DOT(disp,v->hvec)*d*180.0/v->horiz; |
228 |
> |
*yp += DOT(disp,v->vvec)*d*180.0/v->vert; |
229 |
> |
return; |
230 |
|
} |
118 |
– |
*xp = DOT(disp,v->hvec)/v->hn2 + 0.5 - v->hoff; |
119 |
– |
*yp = DOT(disp,v->vvec)/v->vn2 + 0.5 - v->voff; |
231 |
|
} |
232 |
|
|
233 |
|
|
240 |
|
#define check(c,n) if ((av[0][c]&&av[0][c]!=' ') || n>=ac) return(-1) |
241 |
|
extern double atof(); |
242 |
|
|
243 |
< |
if (av[0][0] != '-' || av[0][1] != 'v') |
243 |
> |
if (ac <= 0 || av[0][0] != '-' || av[0][1] != 'v') |
244 |
|
return(-1); |
245 |
|
switch (av[0][2]) { |
246 |
|
case 't': /* type */ |
302 |
|
|
303 |
|
while (*s == ' ') |
304 |
|
s++; |
305 |
< |
do { |
305 |
> |
while (*s) { |
306 |
|
ac = 0; |
307 |
|
do { |
308 |
|
av[ac++] = s; |
315 |
|
if (na+1 < ac) |
316 |
|
s = av[na+1]; |
317 |
|
nvopts++; |
318 |
< |
} |
319 |
< |
} while (*s); |
318 |
> |
} else if (ac > 1) |
319 |
> |
s = av[1]; |
320 |
> |
} |
321 |
|
return(nvopts); |
322 |
|
} |
323 |
|
|
331 |
|
fprintf(fp, " -vd %.6g %.6g %.6g", vp->vdir[0], vp->vdir[1], vp->vdir[2]); |
332 |
|
fprintf(fp, " -vu %.6g %.6g %.6g", vp->vup[0], vp->vup[1], vp->vup[2]); |
333 |
|
fprintf(fp, " -vh %.6g -vv %.6g", vp->horiz, vp->vert); |
334 |
< |
fprintf(fp, " -vs %d -vl %d", vp->hoff, vp->voff); |
334 |
> |
fprintf(fp, " -vs %.6g -vl %.6g", vp->hoff, vp->voff); |
335 |
|
} |
336 |
|
|
337 |
|
|
356 |
|
|
357 |
|
|
358 |
|
int |
359 |
< |
viewfile(fname, vp) /* get view from file */ |
359 |
> |
viewfile(fname, vp, xp, yp) /* get view from file */ |
360 |
|
char *fname; |
361 |
|
VIEW *vp; |
362 |
+ |
int *xp, *yp; |
363 |
|
{ |
364 |
|
extern char *progname; |
365 |
|
FILE *fp; |
372 |
|
gothview = 0; |
373 |
|
|
374 |
|
getheader(fp, gethview); |
375 |
+ |
|
376 |
+ |
if (xp != NULL && yp != NULL |
377 |
+ |
&& fgetresolu(xp, yp, fp) == -1) |
378 |
+ |
gothview = 0; |
379 |
|
|
380 |
|
fclose(fp); |
381 |
|
|