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root/radiance/ray/src/cv/bsdfrep.c
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Comparing ray/src/cv/bsdfrep.c (file contents):
Revision 2.13 by greg, Sun Mar 24 17:22:23 2013 UTC vs.
Revision 2.14 by greg, Fri Sep 20 00:21:39 2013 UTC

# Line 205 | Line 205 | rotate_rbf(RBFNODE *rbf, const FVECT invec)
205          VCOPY(rbf->invec, invec);
206   }
207  
208 – /* Compute volume associated with Gaussian lobe */
209 – double
210 – rbf_volume(const RBFVAL *rbfp)
211 – {
212 –        double  rad = R2ANG(rbfp->crad);
213 –
214 –        return((2.*M_PI) * rbfp->peak * rad*rad);
215 – }
216 –
208   /* Compute outgoing vector from grid position */
209   void
210   ovec_from_pos(FVECT vec, int xpos, int ypos)
# Line 243 | Line 234 | pos_from_vec(int pos[2], const FVECT vec)
234          pos[1] = (int)(sq[1]*grid_res);
235   }
236  
237 + /* Compute volume associated with Gaussian lobe */
238 + double
239 + rbf_volume(const RBFVAL *rbfp)
240 + {
241 +        double  rad = R2ANG(rbfp->crad);
242 +        FVECT   odir;
243 +        double  elev, integ;
244 +                                /* infinite integral approximation */
245 +        integ = (2.*M_PI) * rbfp->peak * rad*rad;
246 +                                /* check if we're near horizon */
247 +        ovec_from_pos(odir, rbfp->gx, rbfp->gy);
248 +        elev = output_orient*odir[2];
249 +                                /* apply cut-off correction if > 1% */
250 +        if (elev < 2.8*rad) {
251 +                /* elev = asin(elev);   /* this is so crude, anyway... */
252 +                integ *= 1. - .5*exp(-.5*elev*elev/(rad*rad));
253 +        }
254 +        return(integ);
255 + }
256 +
257   /* Evaluate RBF for DSF at the given normalized outgoing direction */
258   double
259   eval_rbfrep(const RBFNODE *rp, const FVECT outvec)
# Line 253 | Line 264 | eval_rbfrep(const RBFNODE *rp, const FVECT outvec)
264          FVECT           odir;
265          double          sig2;
266          int             n;
267 +                                /* check for wrong side */
268 +        if (outvec[2] > 0 ^ output_orient > 0)
269 +                return(.0);
270                                  /* use minimum if no information avail. */
271 <        if (rp == NULL) {
258 <                if (outvec[2] > 0 ^ output_orient > 0)
259 <                        return(.0);
271 >        if (rp == NULL)
272                  return(minval);
273 <        }
273 >                                /* sum radial basis function */
274          rbfp = rp->rbfa;
275          for (n = rp->nrbf; n--; rbfp++) {
276                  ovec_from_pos(odir, rbfp->gx, rbfp->gy);

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