28 |
|
COLOR acoef; /* division contribution coefficient */ |
29 |
|
struct s_ambsamp { |
30 |
|
COLOR v; /* hemisphere sample value */ |
31 |
< |
float p[3]; /* intersection point */ |
31 |
> |
FVECT p; /* intersection point */ |
32 |
|
} sa[1]; /* sample array (extends struct) */ |
33 |
|
} AMBHEMI; /* ambient sample hemisphere */ |
34 |
|
|
35 |
|
#define ambsamp(h,i,j) (h)->sa[(i)*(h)->ns + (j)] |
36 |
|
|
37 |
|
typedef struct { |
38 |
< |
FVECT r_i, r_i1, e_i; |
39 |
< |
double nf, I1, I2, J2; |
38 |
> |
FVECT r_i, r_i1, e_i, rI2_eJ2; |
39 |
> |
double nf, I1, I2; |
40 |
|
} FFTRI; /* vectors and coefficients for Hessian calculation */ |
41 |
|
|
42 |
|
|
103 |
|
setcolor(ar.rcoef, AVGREFL, AVGREFL, AVGREFL); |
104 |
|
else |
105 |
|
copycolor(ar.rcoef, hp->acoef); |
106 |
< |
if (rayorigin(&ar, AMBIENT, hp->rp, ar.rcoef) < 0) { |
107 |
< |
setcolor(ap->v, 0., 0., 0.); |
108 |
< |
VCOPY(ap->p, hp->rp->rop); |
109 |
< |
return(NULL); /* no sample taken */ |
110 |
< |
} |
106 |
> |
if (rayorigin(&ar, AMBIENT, hp->rp, ar.rcoef) < 0) |
107 |
> |
goto badsample; |
108 |
|
if (ambacc > FTINY) { |
109 |
|
multcolor(ar.rcoef, hp->acoef); |
110 |
|
scalecolor(ar.rcoef, 1./AVGREFL); |
121 |
|
dimlist[ndims++] = i*hp->ns + j + 90171; |
122 |
|
rayvalue(&ar); /* evaluate ray */ |
123 |
|
ndims--; |
124 |
+ |
if (ar.rt > 20.0*maxarad) /* limit vertex distance */ |
125 |
+ |
ar.rt = 20.0*maxarad; |
126 |
+ |
else if (ar.rt <= FTINY) /* should never happen! */ |
127 |
+ |
goto badsample; |
128 |
+ |
VSUM(ap->p, ar.rorg, ar.rdir, ar.rt); |
129 |
|
multcolor(ar.rcol, ar.rcoef); /* apply coefficient */ |
130 |
|
copycolor(ap->v, ar.rcol); |
129 |
– |
if (ar.rt > 20.0*maxarad) /* limit vertex distance */ |
130 |
– |
VSUM(ap->p, ar.rorg, ar.rdir, 20.0*maxarad); |
131 |
– |
else |
132 |
– |
VCOPY(ap->p, ar.rop); |
131 |
|
return(ap); |
132 |
+ |
badsample: |
133 |
+ |
setcolor(ap->v, 0., 0., 0.); |
134 |
+ |
VCOPY(ap->p, hp->rp->rop); |
135 |
+ |
return(NULL); |
136 |
|
} |
137 |
|
|
138 |
|
|
139 |
|
/* Compute vectors and coefficients for Hessian/gradient calcs */ |
140 |
|
static void |
141 |
< |
comp_fftri(FFTRI *ftp, float ap0[3], float ap1[3], FVECT rop) |
141 |
> |
comp_fftri(FFTRI *ftp, FVECT ap0, FVECT ap1, FVECT rop) |
142 |
|
{ |
143 |
< |
FVECT v1; |
144 |
< |
double dot_e, dot_er, dot_r, dot_r1; |
143 |
> |
FVECT vcp; |
144 |
> |
double dot_e, dot_er, dot_r, dot_r1, J2; |
145 |
> |
int i; |
146 |
|
|
147 |
|
VSUB(ftp->r_i, ap0, rop); |
148 |
|
VSUB(ftp->r_i1, ap1, rop); |
149 |
|
VSUB(ftp->e_i, ap1, ap0); |
150 |
< |
VCROSS(v1, ftp->e_i, ftp->r_i); |
151 |
< |
ftp->nf = 1.0/DOT(v1,v1); |
150 |
> |
VCROSS(vcp, ftp->e_i, ftp->r_i); |
151 |
> |
ftp->nf = 1.0/DOT(vcp,vcp); |
152 |
|
dot_e = DOT(ftp->e_i,ftp->e_i); |
153 |
|
dot_er = DOT(ftp->e_i, ftp->r_i); |
154 |
|
dot_r = DOT(ftp->r_i,ftp->r_i); |
157 |
|
sqrt( ftp->nf ); |
158 |
|
ftp->I2 = ( DOT(ftp->e_i, ftp->r_i1)/dot_r1 - dot_er/dot_r + |
159 |
|
dot_e*ftp->I1 )*0.5*ftp->nf; |
160 |
< |
ftp->J2 = 0.5/dot_e*( 1.0/dot_r - 1.0/dot_r1 ) - |
161 |
< |
dot_er/dot_e*ftp->I2; |
160 |
> |
J2 = 0.5/dot_e*( 1.0/dot_r - 1.0/dot_r1 ) - dot_er/dot_e*ftp->I2; |
161 |
> |
for (i = 3; i--; ) |
162 |
> |
ftp->rI2_eJ2[i] = ftp->I2*ftp->r_i[i] + J2*ftp->e_i[i]; |
163 |
|
} |
164 |
|
|
165 |
|
|
180 |
|
static void |
181 |
|
comp_hessian(FVECT hess[3], FFTRI *ftp, FVECT nrm) |
182 |
|
{ |
183 |
< |
FVECT v1, v2; |
183 |
> |
FVECT vcp; |
184 |
|
FVECT m1[3], m2[3], m3[3], m4[3]; |
185 |
|
double d1, d2, d3, d4; |
186 |
|
double I3, J3, K3; |
195 |
|
J3 = 0.25*d3*(d1*d1 - d2*d2) - d4*d3*I3; |
196 |
|
K3 = d3*(ftp->I2 - I3/d1 - 2.0*d4*J3); |
197 |
|
/* intermediate matrices */ |
198 |
< |
VCROSS(v1, nrm, ftp->e_i); |
199 |
< |
for (j = 3; j--; ) |
196 |
< |
v2[j] = ftp->I2*ftp->r_i[j] + ftp->J2*ftp->e_i[j]; |
197 |
< |
compose_matrix(m1, v1, v2); |
198 |
> |
VCROSS(vcp, nrm, ftp->e_i); |
199 |
> |
compose_matrix(m1, vcp, ftp->rI2_eJ2); |
200 |
|
compose_matrix(m2, ftp->r_i, ftp->r_i); |
201 |
|
compose_matrix(m3, ftp->e_i, ftp->e_i); |
202 |
|
compose_matrix(m4, ftp->r_i, ftp->e_i); |
203 |
< |
VCROSS(v1, ftp->r_i, ftp->e_i); |
204 |
< |
d1 = DOT(nrm, v1); |
203 |
> |
VCROSS(vcp, ftp->r_i, ftp->e_i); |
204 |
> |
d1 = DOT(nrm, vcp); |
205 |
|
d2 = -d1*ftp->I2; |
206 |
|
d1 *= 2.0; |
207 |
|
for (i = 3; i--; ) /* final matrix sum */ |
253 |
|
f1 = 2.0*DOT(nrm, vcp); |
254 |
|
VCROSS(vcp, nrm, ftp->e_i); |
255 |
|
for (i = 3; i--; ) |
256 |
< |
grad[i] = (0.5/PI)*( ftp->I1*vcp[i] + |
255 |
< |
f1*(ftp->I2*ftp->r_i[i] + ftp->J2*ftp->e_i[i]) ); |
256 |
> |
grad[i] = (0.5/PI)*( ftp->I1*vcp[i] + f1*ftp->rI2_eJ2[i] ); |
257 |
|
} |
258 |
|
|
259 |
|
|