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greg |
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#ifndef lint
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static const char RCSid[] = "$Id$";
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#endif
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/*
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* Routines for handling BSDF data within mkillum
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*/
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#include "mkillum.h"
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#include "paths.h"
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struct BSDF_data *
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load_BSDF( /* load BSDF data from file */
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char *fname
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)
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{
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char *path;
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FILE *fp;
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struct BSDF_data *dp;
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path = getpath(fname, getrlibpath(), R_OK);
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if (path == NULL) {
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sprintf(errmsg, "cannot find BSDF file \"%s\"", fname);
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error(WARNING, errmsg);
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return(NULL);
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}
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if ((fp = fopen(path, "r")) == NULL) {
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sprintf(errmsg, "cannot open BSDF \"%s\"", path);
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error(WARNING, errmsg);
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return(NULL);
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}
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dp = (struct BSDF_data *)malloc(sizeof(struct BSDF_data));
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if (dp == NULL)
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goto memerr;
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/* etc... */
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fclose(fp);
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return(dp);
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memerr:
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error(SYSTEM, "out of memory in load_BSDF");
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return NULL; /* pro forma return */
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}
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void
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free_BSDF( /* free BSDF data structure */
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struct BSDF_data *b
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)
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{
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if (b == NULL)
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return;
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free(b->inc_dir);
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free(b->inc_rad);
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free(b->out_dir);
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free(b->out_rad);
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free(b->bsdf);
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free(b);
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}
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void
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r_BSDF_incvec( /* compute random input vector at given location */
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FVECT v,
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struct BSDF_data *b,
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int i,
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double rv,
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MAT4 xm
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)
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{
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FVECT pert;
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double rad;
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int j;
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getBSDF_incvec(v, b, i);
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rad = getBSDF_incrad(b, i);
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multisamp(pert, 3, rv);
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for (j = 0; j < 3; j++)
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v[j] += rad*(2.*pert[j] - 1.);
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if (xm != NULL)
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multv3(v, v, xm);
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normalize(v);
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}
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void
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r_BSDF_outvec( /* compute random output vector at given location */
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FVECT v,
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struct BSDF_data *b,
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int o,
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double rv,
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MAT4 xm
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)
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{
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FVECT pert;
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double rad;
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int j;
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getBSDF_outvec(v, b, o);
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rad = getBSDF_outrad(b, o);
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multisamp(pert, 3, rv);
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for (j = 0; j < 3; j++)
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v[j] += rad*(2.*pert[j] - 1.);
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if (xm != NULL)
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multv3(v, v, xm);
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normalize(v);
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}
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