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#endif |
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/* |
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* Routines to do the actual calcultion and output for mkillum |
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* Routines to do the actual calculation for mkillum |
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*/ |
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#include "mkillum.h" |
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#include "random.h" |
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|
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printobj(mod, obj) /* print out an object */ |
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char *mod; |
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register OBJREC *obj; |
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{ |
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register int i; |
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|
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printf("\n%s %s %s", mod, ofun[obj->otype].funame, obj->oname); |
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printf("\n%d", obj->oargs.nsargs); |
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for (i = 0; i < obj->oargs.nsargs; i++) |
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printf(" %s", obj->oargs.sarg[i]); |
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#ifdef IARGS |
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printf("\n%d", obj->oargs.niargs); |
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for (i = 0; i < obj->oargs.niargs; i++) |
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printf(" %d", obj->oargs.iarg[i]); |
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#else |
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printf("\n0"); |
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#endif |
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printf("\n%d", obj->oargs.nfargs); |
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for (i = 0; i < obj->oargs.nfargs; i++) { |
39 |
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if (i%3 == 0) |
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putchar('\n'); |
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printf(" %18.12g", obj->oargs.farg[i]); |
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} |
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putchar('\n'); |
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} |
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|
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|
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o_default(ob, il, rt, nm) /* default illum action */ |
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OBJREC *ob; |
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struct illum_args *il; |
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nm, ofun[ob->otype].funame, ob->oname); |
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error(WARNING, errmsg); |
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if (!(il->flags & IL_LIGHT)) |
30 |
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printobj(il->altname, ob); |
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printobj(il->altmat, ob); |
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} |
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struct rtproc *rt; |
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char *nm; |
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{ |
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#define MAXMISS (5*n*il->nsamps) |
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int dim[4]; |
42 |
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int n, nalt, nazi; |
43 |
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float *distarr; |
44 |
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double r1, r2; |
45 |
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FVECT dn, org, dir; |
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FVECT u, v; |
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double ur[2], vr[2]; |
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int nmisses; |
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register FACE *fa; |
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register int i, j; |
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/* get/check arguments */ |
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fa = getface(ob); |
53 |
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if (fa->area == 0.0) { |
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freeface(ob); |
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o_default(ob, il, rt, nm); |
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return; |
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} |
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/* set up sampling */ |
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n = PI * il->sampdens; |
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nalt = sqrt(n/PI) + .5; |
61 |
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nazi = PI*nalt + .5; |
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n = nalt*nazi; |
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distarr = (float *)calloc(n, 3*sizeof(float)); |
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if (distarr == NULL) |
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error(SYSTEM, "out of memory in o_face"); |
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mkaxes(u, v, fa->norm); |
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ur[0] = vr[0] = FHUGE; |
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ur[1] = vr[1] = -FHUGE; |
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for (i = 0; i < fa->nv; i++) { |
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r1 = DOT(VERTEX(fa,i),u); |
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if (r1 < ur[0]) ur[0] = r1; |
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if (r1 > ur[1]) ur[1] = r1; |
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r2 = DOT(VERTEX(fa,i),v); |
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if (r2 < vr[0]) vr[0] = r2; |
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if (r2 > vr[1]) vr[1] = r2; |
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} |
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dim[0] = random(); |
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/* sample polygon */ |
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nmisses = 0; |
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for (dim[1] = 0; dim[1] < nalt; dim[1]++) |
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for (dim[2] = 0; dim[2] < nazi; dim[2]++) |
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for (i = 0; i < il->nsamps; i++) { |
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/* random direction */ |
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dim[3] = 1; |
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r1 = (dim[1]+urand(urind(ilhash(dim,4),i)))/nalt; |
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dim[3] = 2; |
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r2 = (dim[2]+urand(urind(ilhash(dim,4),i)))/nazi; |
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flatdir(dn, r1, r2); |
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for (j = 0; j < 3; j++) |
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dir[j] = -dn[0]*u[j] - dn[1]*v[j] - dn[2]*fa->norm[j]; |
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/* random location */ |
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do { |
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dim[3] = 3; |
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r1 = ur[0] + (ur[1]-ur[0]) * |
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urand(urind(ilhash(dim,4),i+nmisses)); |
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dim[3] = 4; |
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r2 = vr[0] + (vr[1]-vr[0]) * |
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urand(urind(ilhash(dim,4),i+nmisses)); |
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for (j = 0; j < 3; j++) |
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org[j] = r1*u[j] + r2*v[j] |
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+ fa->offset*fa->norm[j]; |
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} while (!inface(org, fa) && nmisses++ < MAXMISS); |
103 |
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if (nmisses > MAXMISS) { |
104 |
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objerror(ob, WARNING, "bad aspect"); |
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rt->nrays = 0; |
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freeface(ob); |
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free((char *)distarr); |
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o_default(ob, il, rt, nm); |
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return; |
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} |
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for (j = 0; j < 3; j++) |
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org[j] += .001*fa->norm[j]; |
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/* send sample */ |
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raysamp(distarr+3*(dim[1]*nazi+dim[2]), org, dir, rt); |
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} |
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rayflush(rt); |
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/* write out the face w/ distribution */ |
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flatout(il, distarr, nalt, nazi, u, v, fa->norm); |
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illumout(il, ob); |
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/* clean up */ |
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freeface(ob); |
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free((char *)distarr); |
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#undef MAXMISS |
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} |
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o_sphere(ob, il, rt, nm) /* make an illum sphere */ |
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OBJREC *ob; |
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register OBJREC *ob; |
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struct illum_args *il; |
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struct rtproc *rt; |
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char *nm; |
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int dim[4]; |
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int n, nalt, nazi; |
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float *distarr; |
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double r1, r2; |
137 |
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FVECT pos, dir; |
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> |
double r1, r2, r3; |
137 |
> |
FVECT org, dir; |
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FVECT u, v; |
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register int i, j; |
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/* check arguments */ |
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dim[3] = 1; |
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r1 = (dim[1]+urand(urind(ilhash(dim,4),i)))/nalt; |
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dim[3] = 2; |
160 |
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r2 = (dim[2]+urand(urind(ilhash(dim,4),i)))/nalt; |
160 |
> |
r2 = (dim[2]+urand(urind(ilhash(dim,4),i)))/nazi; |
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rounddir(dir, r1, r2); |
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/* random location */ |
163 |
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mkaxes(u, v, dir); /* yuck! */ |
164 |
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dim[3] = 3; |
165 |
< |
r1 = sqrt(urand(urind(ilhash(dim,4),i))); |
165 |
> |
r3 = sqrt(urand(urind(ilhash(dim,4),i))); |
166 |
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dim[3] = 4; |
167 |
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r2 = 2.*PI*urand(urind(ilhash(dim,4),i)); |
168 |
< |
for (j = 0; j < 3; j++) |
169 |
< |
org[j] = obj->oargs.farg[j] + obj->oargs.farg[3] * |
170 |
< |
( r1*cos(r2)*u[j] + r1*sin(r2)*v[j] |
171 |
< |
- sqrt(1.01-r1*r1)*dir[j] ); |
172 |
< |
|
168 |
> |
r1 = r3*ob->oargs.farg[3]*cos(r2); |
169 |
> |
r2 = r3*ob->oargs.farg[3]*sin(r2); |
170 |
> |
r3 = ob->oargs.farg[3]*sqrt(1.01-r3*r3); |
171 |
> |
for (j = 0; j < 3; j++) { |
172 |
> |
org[j] = ob->oargs.farg[j] + r1*u[j] + r2*v[j] + |
173 |
> |
r3*dir[j]; |
174 |
> |
dir[j] = -dir[j]; |
175 |
> |
} |
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/* send sample */ |
177 |
< |
raysamp(distarr+dim[1]*nazi+dim[2], org, dir, rt); |
177 |
> |
raysamp(distarr+3*(dim[1]*nazi+dim[2]), org, dir, rt); |
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} |
179 |
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rayflush(rt); |
180 |
< |
/* write out distribution */ |
181 |
< |
rounddist(distarr, nalt, nazi, il, ob); |
180 |
> |
/* write out the sphere w/ distribution */ |
181 |
> |
roundout(il, distarr, nalt, nazi); |
182 |
> |
illumout(il, ob); |
183 |
|
/* clean up */ |
184 |
|
free((char *)distarr); |
185 |
|
} |
191 |
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struct rtproc *rt; |
192 |
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char *nm; |
193 |
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{ |
194 |
+ |
int dim[4]; |
195 |
+ |
int n, nalt, nazi; |
196 |
+ |
float *distarr; |
197 |
+ |
double r1, r2, r3; |
198 |
+ |
FVECT dn, org, dir; |
199 |
+ |
FVECT u, v; |
200 |
+ |
register CONE *co; |
201 |
+ |
register int i, j; |
202 |
+ |
/* get/check arguments */ |
203 |
+ |
co = getcone(ob, 0); |
204 |
+ |
/* set up sampling */ |
205 |
+ |
n = PI * il->sampdens; |
206 |
+ |
nalt = sqrt(n/PI) + .5; |
207 |
+ |
nazi = PI*nalt + .5; |
208 |
+ |
n = nalt*nazi; |
209 |
+ |
distarr = (float *)calloc(n, 3*sizeof(float)); |
210 |
+ |
if (distarr == NULL) |
211 |
+ |
error(SYSTEM, "out of memory in o_ring"); |
212 |
+ |
mkaxes(u, v, co->ad); |
213 |
+ |
dim[0] = random(); |
214 |
+ |
/* sample disk */ |
215 |
+ |
for (dim[1] = 0; dim[1] < nalt; dim[1]++) |
216 |
+ |
for (dim[2] = 0; dim[2] < nazi; dim[2]++) |
217 |
+ |
for (i = 0; i < il->nsamps; i++) { |
218 |
+ |
/* random direction */ |
219 |
+ |
dim[3] = 1; |
220 |
+ |
r1 = (dim[1]+urand(urind(ilhash(dim,4),i)))/nalt; |
221 |
+ |
dim[3] = 2; |
222 |
+ |
r2 = (dim[2]+urand(urind(ilhash(dim,4),i)))/nalt; |
223 |
+ |
flatdir(dn, r1, r2); |
224 |
+ |
for (j = 0; j < 3; j++) |
225 |
+ |
dir[j] = -dn[0]*u[j] - dn[1]*v[j] - dn[2]*co->ad[j]; |
226 |
+ |
/* random location */ |
227 |
+ |
dim[3] = 3; |
228 |
+ |
r3 = sqrt(CO_R0(co)*CO_R0(co) + |
229 |
+ |
urand(urind(ilhash(dim,4),i))* |
230 |
+ |
(CO_R1(co)*CO_R1(co) - CO_R0(co)*CO_R0(co))); |
231 |
+ |
dim[3] = 4; |
232 |
+ |
r2 = 2.*PI*urand(urind(ilhash(dim,4),i)); |
233 |
+ |
r1 = r3*cos(r2); |
234 |
+ |
r2 = r3*sin(r2); |
235 |
+ |
for (j = 0; j < 3; j++) |
236 |
+ |
org[j] = CO_P0(co)[j] + r1*u[j] + r1*v[j] + |
237 |
+ |
.001*co->ad[j]; |
238 |
+ |
|
239 |
+ |
/* send sample */ |
240 |
+ |
raysamp(distarr+3*(dim[1]*nazi+dim[2]), org, dir, rt); |
241 |
+ |
} |
242 |
+ |
rayflush(rt); |
243 |
+ |
/* write out the ring w/ distribution */ |
244 |
+ |
flatout(il, distarr, nalt, nazi, u, v, co->ad); |
245 |
+ |
illumout(il, ob); |
246 |
+ |
/* clean up */ |
247 |
+ |
freecone(ob); |
248 |
+ |
free((char *)distarr); |
249 |
|
} |
250 |
|
|
251 |
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|
286 |
|
rt->dest[i][2] += rt->buf[3*i+2]; |
287 |
|
} |
288 |
|
rt->nrays = 0; |
289 |
+ |
} |
290 |
+ |
|
291 |
+ |
|
292 |
+ |
mkaxes(u, v, n) /* compute u and v to go with n */ |
293 |
+ |
FVECT u, v, n; |
294 |
+ |
{ |
295 |
+ |
register int i; |
296 |
+ |
|
297 |
+ |
v[0] = v[1] = v[2] = 0.0; |
298 |
+ |
for (i = 0; i < 3; i++) |
299 |
+ |
if (n[i] < 0.6 && n[i] > -0.6) |
300 |
+ |
break; |
301 |
+ |
v[i] = 1.0; |
302 |
+ |
fcross(u, v, n); |
303 |
+ |
normalize(u); |
304 |
+ |
fcross(v, n, u); |
305 |
+ |
} |
306 |
+ |
|
307 |
+ |
|
308 |
+ |
rounddir(dv, alt, azi) /* compute uniform spherical direction */ |
309 |
+ |
register FVECT dv; |
310 |
+ |
double alt, azi; |
311 |
+ |
{ |
312 |
+ |
double d1, d2; |
313 |
+ |
|
314 |
+ |
dv[2] = 1. - 2.*alt; |
315 |
+ |
d1 = sqrt(1. - dv[2]*dv[2]); |
316 |
+ |
d2 = 2.*PI * azi; |
317 |
+ |
dv[0] = d1*cos(d2); |
318 |
+ |
dv[1] = d1*sin(d2); |
319 |
+ |
} |
320 |
+ |
|
321 |
+ |
|
322 |
+ |
flatdir(dv, alt, azi) /* compute uniform hemispherical direction */ |
323 |
+ |
register FVECT dv; |
324 |
+ |
double alt, azi; |
325 |
+ |
{ |
326 |
+ |
double d1, d2; |
327 |
+ |
|
328 |
+ |
d1 = sqrt(alt); |
329 |
+ |
d2 = 2.*PI * azi; |
330 |
+ |
dv[0] = d1*cos(d2); |
331 |
+ |
dv[1] = d1*sin(d2); |
332 |
+ |
dv[2] = sqrt(1. - alt); |
333 |
|
} |