| 36 |
|
* [ext_r ext_g ext_b [albedo [gecc]]] |
| 37 |
|
* |
| 38 |
|
* The primaries indicate medium extinction per unit length (absorption |
| 39 |
< |
* plus scattering). The albedo is the ratio of scattering to extinction, |
| 39 |
> |
* plus scattering), which is added to the global extinction coefficient, set |
| 40 |
> |
* by the -me option. The albedo is the ratio of scattering to extinction, |
| 41 |
|
* and is set globally by the -ma option (salbedo) and overridden here. |
| 42 |
|
* The Heyney-Greenstein eccentricity parameter (-mg seccg) indicates how much |
| 43 |
|
* scattering favors the forward direction. A value of 0 means isotropic |
| 44 |
|
* scattering. A value approaching 1 indicates strong forward scattering. |
| 45 |
|
*/ |
| 46 |
|
|
| 46 |
– |
#define MAXSLIST 32 /* maximum sources to check */ |
| 47 |
|
#define RELAYDELIM '>' /* relay delimiter character */ |
| 48 |
|
|
| 49 |
|
extern COLOR cextinction; /* global coefficient of extinction */ |
| 66 |
|
|
| 67 |
|
|
| 68 |
|
static int |
| 69 |
< |
srcmatch(sn, id) /* check for an id match on a light source */ |
| 70 |
< |
register int sn; |
| 71 |
< |
char *id; |
| 69 |
> |
srcmatch(sp, id) /* check for an id match on a light source */ |
| 70 |
> |
register SRCREC *sp; |
| 71 |
> |
register char *id; |
| 72 |
|
{ |
| 73 |
|
extern char *index(); |
| 74 |
|
register char *cp; |
| 75 |
< |
again: |
| 76 |
< |
if (source[sn].so == NULL) /* just in case */ |
| 77 |
< |
return(0); |
| 78 |
< |
if ((cp = index(id, RELAYDELIM)) != NULL) { /* relay source */ |
| 79 |
< |
if (!(source[sn].sflags & SVIRTUAL)) |
| 75 |
> |
/* check for relay sources */ |
| 76 |
> |
while ((cp = index(id, RELAYDELIM)) != NULL) { |
| 77 |
> |
if (!(sp->sflags & SVIRTUAL) || sp->so == NULL) |
| 78 |
|
return(0); |
| 79 |
< |
*cp = '\0'; |
| 82 |
< |
if (strcmp(id, source[sn].so->oname)) { |
| 83 |
< |
*cp = RELAYDELIM; |
| 79 |
> |
if (strncmp(id, sp->so->oname, cp-id) || sp->so->oname[cp-id]) |
| 80 |
|
return(0); |
| 81 |
< |
} |
| 82 |
< |
*cp = RELAYDELIM; |
| 87 |
< |
id = cp + 1; /* recurse */ |
| 88 |
< |
sn = source[sn].sa.sv.sn; |
| 89 |
< |
goto again; |
| 81 |
> |
id = cp + 1; /* relay to next */ |
| 82 |
> |
sp = source + sp->sa.sv.sn; |
| 83 |
|
} |
| 84 |
< |
if (source[sn].sflags & SVIRTUAL) |
| 84 |
> |
if (sp->sflags & SVIRTUAL || sp->so == NULL) |
| 85 |
|
return(0); |
| 86 |
< |
return(!strcmp(id, source[sn].so->oname)); |
| 86 |
> |
return(!strcmp(id, sp->so->oname)); |
| 87 |
|
} |
| 88 |
|
|
| 89 |
|
|
| 90 |
+ |
static |
| 91 |
+ |
add2slist(r, sl) /* add source list to ray's */ |
| 92 |
+ |
register RAY *r; |
| 93 |
+ |
register int *sl; |
| 94 |
+ |
{ |
| 95 |
+ |
static int slspare[MAXSLIST+1]; /* in case of emergence */ |
| 96 |
+ |
register int i; |
| 97 |
+ |
|
| 98 |
+ |
if (sl == NULL || sl[0] == 0) /* nothing to add */ |
| 99 |
+ |
return; |
| 100 |
+ |
if (r->slights == NULL) |
| 101 |
+ |
(r->slights = slspare)[0] = 0; /* just once per ray path */ |
| 102 |
+ |
for (i = sl[0]; i > 0; i--) |
| 103 |
+ |
if (!inslist(r->slights, sl[i])) { |
| 104 |
+ |
if (r->slights[0] >= MAXSLIST) |
| 105 |
+ |
error(USER, "scattering source list overflow"); |
| 106 |
+ |
r->slights[++r->slights[0]] = sl[i]; |
| 107 |
+ |
} |
| 108 |
+ |
} |
| 109 |
+ |
|
| 110 |
+ |
|
| 111 |
|
m_mist(m, r) /* process a ray entering or leaving some mist */ |
| 112 |
|
OBJREC *m; |
| 113 |
|
register RAY *r; |
| 121 |
|
/* check arguments */ |
| 122 |
|
if (m->oargs.nfargs > 5) |
| 123 |
|
objerror(m, USER, "bad arguments"); |
| 110 |
– |
if (m->oargs.nsargs > MAXSLIST) |
| 111 |
– |
objerror(m, USER, "too many sources in list"); |
| 124 |
|
/* get source indices */ |
| 125 |
|
if (m->oargs.nsargs > 0 && (myslist = (int *)m->os) == NULL) { |
| 126 |
+ |
if (m->oargs.nsargs > MAXSLIST) |
| 127 |
+ |
objerror(m, USER, "too many sources in list"); |
| 128 |
|
myslist = (int *)malloc((m->oargs.nsargs+1)*sizeof(int)); |
| 129 |
|
if (myslist == NULL) |
| 130 |
|
goto memerr; |
| 131 |
< |
myslist[0] = m->oargs.nsargs; /* size is first in set */ |
| 132 |
< |
for (j = myslist[0]; j > 0; j--) { |
| 131 |
> |
myslist[0] = 0; /* size is first in list */ |
| 132 |
> |
for (j = 0; j < m->oargs.nsargs; j++) { |
| 133 |
|
i = nsources; /* look up each source id */ |
| 134 |
|
while (i--) |
| 135 |
< |
if (srcmatch(i, m->oargs.sarg[j-1])) |
| 135 |
> |
if (srcmatch(source+i, m->oargs.sarg[j])) |
| 136 |
|
break; |
| 137 |
|
if (i < 0) { |
| 138 |
|
sprintf(errmsg, "unknown source \"%s\"", |
| 139 |
< |
m->oargs.sarg[j-1]); |
| 139 |
> |
m->oargs.sarg[j]); |
| 140 |
|
objerror(m, WARNING, errmsg); |
| 141 |
+ |
} else if (inslist(myslist, i)) { |
| 142 |
+ |
sprintf(errmsg, "duplicate source \"%s\"", |
| 143 |
+ |
m->oargs.sarg[j]); |
| 144 |
+ |
objerror(m, WARNING, errmsg); |
| 145 |
|
} else |
| 146 |
< |
myslist[j] = i; |
| 146 |
> |
myslist[++myslist[0]] = i; |
| 147 |
|
} |
| 148 |
|
m->os = (char *)myslist; |
| 149 |
|
} |
| 159 |
|
return(1); |
| 160 |
|
VCOPY(p.rdir, r->rdir); |
| 161 |
|
p.slights = newslist; |
| 162 |
< |
if (r->slights != NULL) |
| 162 |
> |
if (r->slights != NULL) /* copy old list if one */ |
| 163 |
|
for (j = r->slights[0]; j >= 0; j--) |
| 164 |
|
p.slights[j] = r->slights[j]; |
| 165 |
|
else |
| 170 |
|
p.albedo = m->oargs.farg[3]; |
| 171 |
|
if (m->oargs.nfargs > 4) |
| 172 |
|
p.gecc = m->oargs.farg[4]; |
| 173 |
< |
if (myslist != NULL) /* add to list */ |
| 156 |
< |
for (j = myslist[0]; j > 0; j--) |
| 157 |
< |
if (!inslist(p.slights, myslist[j])) { |
| 158 |
< |
if (p.slights[0] >= MAXSLIST) |
| 159 |
< |
error(USER, |
| 160 |
< |
"scattering source list overflow"); |
| 161 |
< |
p.slights[++p.slights[0]] = myslist[j]; |
| 162 |
< |
} |
| 173 |
> |
add2slist(&p, myslist); /* add to list */ |
| 174 |
|
} else { /* leaving ray */ |
| 164 |
– |
re = colval(r->cext,RED) - colval(mext,RED); |
| 165 |
– |
ge = colval(r->cext,GRN) - colval(mext,GRN); |
| 166 |
– |
be = colval(r->cext,BLU) - colval(mext,BLU); |
| 167 |
– |
setcolor(p.cext, re<0. ? 0. : re, |
| 168 |
– |
ge<0. ? 0. : ge, |
| 169 |
– |
be<0. ? 0. : be); |
| 170 |
– |
if (m->oargs.nfargs > 3) |
| 171 |
– |
p.albedo = salbedo; |
| 172 |
– |
if (m->oargs.nfargs > 4) |
| 173 |
– |
p.gecc = seccg; |
| 175 |
|
if (myslist != NULL) { /* delete from list */ |
| 176 |
|
for (j = myslist[0]; j > 0; j--) |
| 177 |
|
if (i = inslist(p.slights, myslist[j])) |
| 179 |
|
for (i = 0, j = 1; j <= p.slights[0]; j++) |
| 180 |
|
if (p.slights[j] != -1) |
| 181 |
|
p.slights[++i] = p.slights[j]; |
| 182 |
+ |
if (p.slights[0] - i < myslist[0]) { /* fix old */ |
| 183 |
+ |
addcolor(r->cext, mext); |
| 184 |
+ |
if (m->oargs.nfargs > 3) |
| 185 |
+ |
r->albedo = m->oargs.farg[3]; |
| 186 |
+ |
if (m->oargs.nfargs > 4) |
| 187 |
+ |
r->gecc = m->oargs.farg[4]; |
| 188 |
+ |
add2slist(r, myslist); |
| 189 |
+ |
} |
| 190 |
|
p.slights[0] = i; |
| 191 |
|
} |
| 192 |
+ |
if ((re = colval(r->cext,RED) - colval(mext,RED)) < |
| 193 |
+ |
colval(cextinction,RED)) |
| 194 |
+ |
re = colval(cextinction,RED); |
| 195 |
+ |
if ((ge = colval(r->cext,GRN) - colval(mext,GRN)) < |
| 196 |
+ |
colval(cextinction,GRN)) |
| 197 |
+ |
ge = colval(cextinction,GRN); |
| 198 |
+ |
if ((be = colval(r->cext,BLU) - colval(mext,BLU)) < |
| 199 |
+ |
colval(cextinction,BLU)) |
| 200 |
+ |
be = colval(cextinction,BLU); |
| 201 |
+ |
setcolor(p.cext, re, ge, be); |
| 202 |
+ |
if (m->oargs.nfargs > 3) |
| 203 |
+ |
p.albedo = salbedo; |
| 204 |
+ |
if (m->oargs.nfargs > 4) |
| 205 |
+ |
p.gecc = seccg; |
| 206 |
|
} |
| 207 |
|
rayvalue(&p); /* calls rayparticipate() */ |
| 208 |
|
copycolor(r->rcol, p.rcol); /* return value */ |
