| 1 |
greg |
1.1 |
#ifndef lint |
| 2 |
greg |
2.5 |
static const char RCSid[] = "$Id$"; |
| 3 |
greg |
1.1 |
#endif |
| 4 |
|
|
/* |
| 5 |
|
|
* t_data.c - routine for stored textures |
| 6 |
greg |
2.5 |
*/ |
| 7 |
|
|
|
| 8 |
greg |
2.6 |
#include "copyright.h" |
| 9 |
greg |
1.1 |
|
| 10 |
|
|
#include "ray.h" |
| 11 |
|
|
|
| 12 |
|
|
#include "data.h" |
| 13 |
|
|
|
| 14 |
greg |
2.2 |
#include "func.h" |
| 15 |
|
|
|
| 16 |
greg |
1.1 |
/* |
| 17 |
|
|
* A stored texture is specified as follows: |
| 18 |
|
|
* |
| 19 |
|
|
* modifier texdata name |
| 20 |
|
|
* 8+ xfunc yfunc zfunc xdfname ydfname zdfname vfname v0 v1 .. xf |
| 21 |
|
|
* 0 |
| 22 |
|
|
* n A1 A2 .. An |
| 23 |
|
|
* |
| 24 |
|
|
* Vfname is the name of the file where the variable definitions |
| 25 |
|
|
* can be found. The list of real arguments can be accessed by |
| 26 |
|
|
* definitions in the file. The dfnames are the data file |
| 27 |
|
|
* names. The dimensions of the data files and the number |
| 28 |
|
|
* of variables must match. The funcs take three arguments to produce |
| 29 |
|
|
* interpolated values from the file. The xf is a transformation |
| 30 |
|
|
* to get from the original coordinates to the current coordinates. |
| 31 |
|
|
*/ |
| 32 |
|
|
|
| 33 |
|
|
|
| 34 |
|
|
t_data(m, r) /* interpolate texture data */ |
| 35 |
|
|
register OBJREC *m; |
| 36 |
|
|
RAY *r; |
| 37 |
|
|
{ |
| 38 |
|
|
int nv; |
| 39 |
greg |
2.3 |
FVECT disp; |
| 40 |
|
|
double dval[3], pt[MAXDIM]; |
| 41 |
greg |
1.4 |
double d; |
| 42 |
greg |
1.1 |
DATARRAY *dp; |
| 43 |
greg |
2.2 |
register MFUNC *mf; |
| 44 |
greg |
1.1 |
register int i; |
| 45 |
|
|
|
| 46 |
|
|
if (m->oargs.nsargs < 8) |
| 47 |
|
|
objerror(m, USER, "bad # arguments"); |
| 48 |
greg |
2.2 |
dp = getdata(m->oargs.sarg[3]); |
| 49 |
|
|
i = (1 << (nv = dp->nd)) - 1; |
| 50 |
|
|
mf = getfunc(m, 6, i<<7, 1); |
| 51 |
|
|
setfunc(m, r); |
| 52 |
|
|
errno = 0; |
| 53 |
greg |
2.3 |
for (i = 0; i < nv; i++) |
| 54 |
greg |
2.2 |
pt[i] = evalue(mf->ep[i]); |
| 55 |
greg |
2.3 |
if (errno) |
| 56 |
|
|
goto computerr; |
| 57 |
greg |
2.2 |
dval[0] = datavalue(dp, pt); |
| 58 |
|
|
for (i = 1; i < 3; i++) { |
| 59 |
|
|
dp = getdata(m->oargs.sarg[i+3]); |
| 60 |
greg |
1.1 |
if (dp->nd != nv) |
| 61 |
greg |
2.2 |
objerror(m, USER, "dimension error"); |
| 62 |
greg |
1.1 |
dval[i] = datavalue(dp, pt); |
| 63 |
|
|
} |
| 64 |
|
|
errno = 0; |
| 65 |
greg |
2.3 |
for (i = 0; i < 3; i++) |
| 66 |
greg |
2.2 |
disp[i] = funvalue(m->oargs.sarg[i], 3, dval); |
| 67 |
greg |
2.3 |
if (errno) |
| 68 |
|
|
goto computerr; |
| 69 |
greg |
2.2 |
if (mf->f != &unitxf) |
| 70 |
|
|
multv3(disp, disp, mf->f->xfm); |
| 71 |
greg |
1.6 |
if (r->rox != NULL) { |
| 72 |
|
|
multv3(disp, disp, r->rox->f.xfm); |
| 73 |
greg |
2.2 |
d = 1.0 / (mf->f->sca * r->rox->f.sca); |
| 74 |
greg |
1.6 |
} else |
| 75 |
greg |
2.2 |
d = 1.0 / mf->f->sca; |
| 76 |
greg |
1.1 |
for (i = 0; i < 3; i++) |
| 77 |
greg |
1.4 |
r->pert[i] += disp[i] * d; |
| 78 |
greg |
2.4 |
return(0); |
| 79 |
greg |
1.1 |
computerr: |
| 80 |
|
|
objerror(m, WARNING, "compute error"); |
| 81 |
greg |
2.4 |
return(0); |
| 82 |
greg |
1.1 |
} |
