| 1 |
#ifndef lint |
| 2 |
static const char RCSid[] = "$Id: genbox.c,v 2.14 2025/06/06 19:11:21 greg Exp $"; |
| 3 |
#endif |
| 4 |
/* |
| 5 |
* genbox.c - generate a parallelepiped. |
| 6 |
* |
| 7 |
* 1/8/86 |
| 8 |
*/ |
| 9 |
|
| 10 |
#include "rtio.h" |
| 11 |
#include "rtmath.h" |
| 12 |
#include "objutil.h" |
| 13 |
#include "paths.h" |
| 14 |
|
| 15 |
int verbose = 0; |
| 16 |
|
| 17 |
char let[]="0123456789._ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"; |
| 18 |
|
| 19 |
char *cmtype; /* ppd material type */ |
| 20 |
|
| 21 |
char *cname; /* ppd name */ |
| 22 |
|
| 23 |
double size[3]; /* ppd size */ |
| 24 |
|
| 25 |
int rounde = 0; /* round edges? (#segments = 2^rounde) */ |
| 26 |
|
| 27 |
double bevel = 0.0; /* bevel amount or round edge radius */ |
| 28 |
|
| 29 |
int rev = 0; /* boolean true for reversed normals */ |
| 30 |
|
| 31 |
Scene *obj = NULL; /* save as .OBJ scene if not NULL */ |
| 32 |
|
| 33 |
int vid[0100]; /* vertex ID's for .OBJ scene */ |
| 34 |
|
| 35 |
|
| 36 |
static int |
| 37 |
overtex(int v) /* index a .OBJ vertex */ |
| 38 |
{ |
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double vpos[3]; |
| 40 |
int i; |
| 41 |
|
| 42 |
if (vid[v] >= 0) /* already have this vertex? */ |
| 43 |
return(vid[v]); |
| 44 |
/* else create new ID */ |
| 45 |
for (i = 0; i < 3; i++) |
| 46 |
if (v>>i & 010) |
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vpos[i] = (v>>i & 01)^rev ? size[i]-bevel : bevel; |
| 48 |
else |
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vpos[i] = (v>>i & 01)^rev ? size[i] : 0.0; |
| 50 |
|
| 51 |
return(vid[v] = addVertex(obj, vpos[0], vpos[1], vpos[2])); |
| 52 |
} |
| 53 |
|
| 54 |
|
| 55 |
static int |
| 56 |
onormal(int vid1, int vid2, int vid3) /* index a .OBJ normal */ |
| 57 |
{ |
| 58 |
double *p1 = obj->vert[vid1].p; |
| 59 |
double *p2 = obj->vert[vid2].p; |
| 60 |
double *p3 = obj->vert[vid3].p; |
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FVECT sv1, sv2, nrm; |
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|
| 63 |
VSUB(sv1, p2, p1); |
| 64 |
VSUB(sv2, p3, p2); |
| 65 |
VCROSS(nrm, sv1, sv2); |
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|
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return(addNormal(obj, nrm[0], nrm[1], nrm[2])); |
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} |
| 69 |
|
| 70 |
|
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static void |
| 72 |
vertex(int v) /* print a Radiance vertex */ |
| 73 |
{ |
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int i; |
| 75 |
|
| 76 |
for (i = 0; i < 3; i++) { |
| 77 |
if (v & 010) |
| 78 |
printf("\t%18.12g", (v&01)^rev ? size[i]-bevel : bevel); |
| 79 |
else |
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printf("\t%18.12g", (v&01)^rev ? size[i] : 0.0); |
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v >>= 1; |
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} |
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fputc('\n', stdout); |
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} |
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|
| 86 |
|
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static void |
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side(int a, int b, int c, int d) /* generate a rectangular face */ |
| 89 |
{ |
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if (obj != NULL) { /* working on .OBJ? */ |
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VNDX quadv[4]; |
| 92 |
memset(quadv, 0xff, sizeof(quadv)); |
| 93 |
quadv[0][0] = overtex(a); |
| 94 |
quadv[1][0] = overtex(b); |
| 95 |
quadv[2][0] = overtex(c); |
| 96 |
quadv[3][0] = overtex(d); |
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if (rounde) /* add normal if rounded */ |
| 98 |
quadv[0][2] = quadv[1][2] = quadv[2][2] = quadv[3][2] |
| 99 |
= onormal(quadv[0][0], quadv[1][0], quadv[2][0]); |
| 100 |
addFace(obj, quadv, 4); |
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return; |
| 102 |
} |
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/* Radiance output */ |
| 104 |
printf("\n%s polygon %s.%c%c%c%c\n", cmtype, cname, |
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let[a], let[b], let[c], let[d]); |
| 106 |
printf("0\n0\n12\n"); |
| 107 |
vertex(a); |
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vertex(b); |
| 109 |
vertex(c); |
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vertex(d); |
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} |
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|
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|
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static void |
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corner(int a, int b, int c) /* generate a triangular face */ |
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{ |
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if (obj != NULL) { /* working on .OBJ? */ |
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VNDX triv[3]; |
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memset(triv, 0xff, sizeof(triv)); |
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triv[0][0] = overtex(a); |
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triv[1][0] = overtex(b); |
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triv[2][0] = overtex(c); |
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addFace(obj, triv, 3); |
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return; |
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} |
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/* Radiance output */ |
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printf("\n%s polygon %s.%c%c%c\n", cmtype, cname, |
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let[a], let[b], let[c]); |
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printf("0\n0\n9\n"); |
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vertex(a); |
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vertex(b); |
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vertex(c); |
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} |
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|
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|
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static void |
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cylinder(int v0, int v1) /* generate a rounded edge */ |
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{ |
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if (obj != NULL) { /* segmenting for .OBJ? */ |
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const int nsgn = 1 - 2*rev; |
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const int nseg = 1<<rounde; |
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const double astep = 0.5*PI/(double)nseg; |
| 143 |
const int vid0 = overtex(v0); |
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const int vid1 = overtex(v1); |
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FVECT p0, p1; |
| 146 |
FVECT axis[2], voff; |
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int previd[2]; |
| 148 |
int prenid; |
| 149 |
VNDX quadv[4]; |
| 150 |
double coef[2]; |
| 151 |
int i, j; |
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/* need to copy b/c realloc */ |
| 153 |
VCOPY(p0, obj->vert[vid0].p); |
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VCOPY(p1, obj->vert[vid1].p); |
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|
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memset(axis, 0, sizeof(axis)); |
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|
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switch ((v0 ^ v1) & 07) { |
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case 01: /* edge along X-axis */ |
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axis[1][1] = bevel*(1. - 2.*(p1[1] < .5*size[1])); |
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axis[0][2] = bevel*(1. - 2.*(p1[2] < .5*size[2])); |
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break; |
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case 02: /* edge along Y-axis */ |
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axis[0][0] = bevel*(1. - 2.*(p1[0] < .5*size[0])); |
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axis[1][2] = bevel*(1. - 2.*(p1[2] < .5*size[2])); |
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break; |
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case 04: /* edge along Z-axis */ |
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axis[0][1] = bevel*(1. - 2.*(p1[1] < .5*size[1])); |
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axis[1][0] = bevel*(1. - 2.*(p1[0] < .5*size[0])); |
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break; |
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} |
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previd[0] = addVertex(obj, p0[0]+axis[0][0], |
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p0[1]+axis[0][1], p0[2]+axis[0][2]); |
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previd[1] = addVertex(obj, p1[0]+axis[0][0], |
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p1[1]+axis[0][1], p1[2]+axis[0][2]); |
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prenid = addNormal(obj, axis[0][0]*nsgn, |
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axis[0][1]*nsgn, axis[0][2]*nsgn); |
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for (i = 1; i <= nseg; i++) { |
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memset(quadv, 0xff, sizeof(quadv)); |
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quadv[0][0] = previd[0]; |
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quadv[1][0] = previd[1]; |
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quadv[0][2] = quadv[1][2] = prenid; |
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coef[0] = cos(astep*i); |
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coef[1] = sin(astep*i); |
| 185 |
for (j = 0; j < 3; j++) |
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voff[j] = coef[0]*axis[0][j] + coef[1]*axis[1][j]; |
| 187 |
previd[0] = quadv[3][0] |
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= addVertex(obj, p0[0]+voff[0], |
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p0[1]+voff[1], p0[2]+voff[2]); |
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previd[1] = quadv[2][0] |
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= addVertex(obj, p1[0]+voff[0], |
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p1[1]+voff[1], p1[2]+voff[2]); |
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prenid = quadv[2][2] = quadv[3][2] |
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= addNormal(obj, voff[0]*nsgn, |
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voff[1]*nsgn, voff[2]*nsgn); |
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addFace(obj, quadv, 4); |
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} |
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return; |
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} |
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/* Radiance output */ |
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printf("\n%s cylinder %s.%c%c\n", cmtype, cname, let[v0], let[v1]); |
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printf("0\n0\n7\n"); |
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vertex(v0); |
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vertex(v1); |
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printf("\t%18.12g\n", bevel); |
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} |
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|
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|
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static void /* recursive corner subdivision */ |
| 210 |
osubcorner(const FVECT orig, const FVECT c0, const FVECT c1, const FVECT c2, int lvl) |
| 211 |
{ |
| 212 |
if (lvl-- <= 0) { /* reached terminal depth? */ |
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const int nsgn = 1 - 2*rev; |
| 214 |
FVECT vpos; |
| 215 |
VNDX triv[3]; /* output smoothed triangle */ |
| 216 |
VSUM(vpos, orig, c0, bevel); |
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triv[0][0] = addVertex(obj, vpos[0], vpos[1], vpos[2]); |
| 218 |
triv[0][2] = addNormal(obj, c0[0]*nsgn, c0[1]*nsgn, c0[2]*nsgn); |
| 219 |
VSUM(vpos, orig, c1, bevel); |
| 220 |
triv[1][0] = addVertex(obj, vpos[0], vpos[1], vpos[2]); |
| 221 |
triv[1][2] = addNormal(obj, c1[0]*nsgn, c1[1]*nsgn, c1[2]*nsgn); |
| 222 |
VSUM(vpos, orig, c2, bevel); |
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triv[2][0] = addVertex(obj, vpos[0], vpos[1], vpos[2]); |
| 224 |
triv[2][2] = addNormal(obj, c2[0]*nsgn, c2[1]*nsgn, c2[2]*nsgn); |
| 225 |
triv[0][1] = triv[1][1] = triv[2][1] = -1; |
| 226 |
addFace(obj, triv, 3); |
| 227 |
} else { /* else subdivide 4 subcorners */ |
| 228 |
FVECT m01, m12, m20; |
| 229 |
VADD(m01, c0, c1); normalize(m01); |
| 230 |
VADD(m12, c1, c2); normalize(m12); |
| 231 |
VADD(m20, c2, c0); normalize(m20); |
| 232 |
osubcorner(orig, c0, m01, m20, lvl); |
| 233 |
osubcorner(orig, c1, m12, m01, lvl); |
| 234 |
osubcorner(orig, c2, m20, m12, lvl); |
| 235 |
osubcorner(orig, m01, m12, m20, lvl); |
| 236 |
} |
| 237 |
} |
| 238 |
|
| 239 |
|
| 240 |
static void |
| 241 |
sphere(int v0) /* generate a rounded corner */ |
| 242 |
{ |
| 243 |
if (obj != NULL) { /* segmenting for .OBJ? */ |
| 244 |
FVECT orig, cdir[3]; |
| 245 |
int i; |
| 246 |
memset(cdir, 0, sizeof(cdir)); |
| 247 |
for (i = 0; i < 3; i++) |
| 248 |
cdir[i][i] = 2*((v0>>i & 01)^rev) - 1; |
| 249 |
switch (v0 & 07) { |
| 250 |
case 0: |
| 251 |
case 3: |
| 252 |
case 5: |
| 253 |
case 6: |
| 254 |
VCOPY(orig, cdir[0]); |
| 255 |
VCOPY(cdir[0], cdir[1]); |
| 256 |
VCOPY(cdir[1], orig); |
| 257 |
} |
| 258 |
i = overtex(v0); |
| 259 |
VCOPY(orig, obj->vert[i].p); /* realloc remedy */ |
| 260 |
osubcorner(orig, cdir[0], cdir[1], cdir[2], rounde); |
| 261 |
return; |
| 262 |
} |
| 263 |
/* Radiance output */ |
| 264 |
printf("\n%s sphere %s.%c\n", cmtype, cname, let[v0]); |
| 265 |
printf("0\n0\n4\n"); |
| 266 |
vertex(v0); |
| 267 |
printf("\t%18.12g\n", bevel); |
| 268 |
} |
| 269 |
|
| 270 |
|
| 271 |
int |
| 272 |
main(int argc, char *argv[]) |
| 273 |
{ |
| 274 |
int smooth = 0; |
| 275 |
int nsegs = 1; |
| 276 |
int objout = 0; |
| 277 |
int i; |
| 278 |
|
| 279 |
if (argc < 6) |
| 280 |
goto userr; |
| 281 |
|
| 282 |
cmtype = argv[1]; |
| 283 |
cname = argv[2]; |
| 284 |
size[0] = atof(argv[3]); |
| 285 |
size[1] = atof(argv[4]); |
| 286 |
size[2] = atof(argv[5]); |
| 287 |
if ((size[0] <= 0.0) | (size[1] <= 0.0) | (size[2] <= 0.0)) |
| 288 |
goto userr; |
| 289 |
|
| 290 |
for (i = 6; i < argc; i++) { |
| 291 |
if (argv[i][0] != '-') |
| 292 |
goto userr; |
| 293 |
switch (argv[i][1]) { |
| 294 |
case 'o': /* requesting .OBJ output */ |
| 295 |
objout = 1; |
| 296 |
break; |
| 297 |
case 'i': /* invert surface normals */ |
| 298 |
rev = 1; |
| 299 |
break; |
| 300 |
case 's': /* normal smoothing? */ |
| 301 |
smooth = 1; |
| 302 |
break; |
| 303 |
case 'r': /* rounded edges/corners */ |
| 304 |
rounde = 1; |
| 305 |
/* fall through */ |
| 306 |
case 'b': /* beveled edges */ |
| 307 |
bevel = atof(argv[++i]); |
| 308 |
if (bevel <= 0.0) |
| 309 |
goto userr; |
| 310 |
break; |
| 311 |
case 'n': /* #segments for rounding */ |
| 312 |
nsegs = atoi(argv[++i]); |
| 313 |
if (nsegs <= 0) |
| 314 |
goto userr; |
| 315 |
break; |
| 316 |
default: |
| 317 |
goto userr; |
| 318 |
} |
| 319 |
} |
| 320 |
if ((objout|rev) & (nsegs==1)) /* default to 32 segments/edge */ |
| 321 |
nsegs = 32; |
| 322 |
if (rounde) { /* rounding edges/corners? */ |
| 323 |
--nsegs; |
| 324 |
while ((nsegs >>= 1)) /* segmentation requested? */ |
| 325 |
++rounde; |
| 326 |
} |
| 327 |
if (rounde > 1 || objout) { /* save as .OBJ scene? */ |
| 328 |
obj = newScene(); |
| 329 |
setMaterial(obj, cmtype); |
| 330 |
setGroup(obj, cname); |
| 331 |
memset(vid, 0xff, sizeof(vid)); |
| 332 |
} |
| 333 |
fputs("# ", stdout); /* write command as comment */ |
| 334 |
printargs(argc, argv, stdout); |
| 335 |
|
| 336 |
if (bevel > 0.0) { /* minor faces */ |
| 337 |
side(051, 055, 054, 050); |
| 338 |
side(064, 066, 062, 060); |
| 339 |
side(032, 033, 031, 030); |
| 340 |
side(053, 052, 056, 057); |
| 341 |
side(065, 061, 063, 067); |
| 342 |
side(036, 034, 035, 037); |
| 343 |
} |
| 344 |
if (bevel > 0.0 && !rounde) { /* bevel faces */ |
| 345 |
side(031, 051, 050, 030); |
| 346 |
side(060, 062, 032, 030); |
| 347 |
side(050, 054, 064, 060); |
| 348 |
side(034, 036, 066, 064); |
| 349 |
side(037, 057, 056, 036); |
| 350 |
side(052, 062, 066, 056); |
| 351 |
side(052, 053, 033, 032); |
| 352 |
side(057, 067, 063, 053); |
| 353 |
side(061, 031, 033, 063); |
| 354 |
side(065, 067, 037, 035); |
| 355 |
side(055, 051, 061, 065); |
| 356 |
side(034, 054, 055, 035); |
| 357 |
/* bevel corners */ |
| 358 |
corner(030, 050, 060); |
| 359 |
corner(051, 031, 061); |
| 360 |
corner(032, 062, 052); |
| 361 |
corner(064, 054, 034); |
| 362 |
corner(036, 056, 066); |
| 363 |
corner(065, 035, 055); |
| 364 |
corner(053, 063, 033); |
| 365 |
corner(037, 067, 057); |
| 366 |
} |
| 367 |
if (bevel > 0.0 && rounde) { /* round edges */ |
| 368 |
cylinder(070, 071); |
| 369 |
cylinder(070, 074); |
| 370 |
cylinder(070, 072); |
| 371 |
cylinder(073, 071); |
| 372 |
cylinder(073, 072); |
| 373 |
cylinder(073, 077); |
| 374 |
cylinder(075, 071); |
| 375 |
cylinder(075, 074); |
| 376 |
cylinder(075, 077); |
| 377 |
cylinder(076, 072); |
| 378 |
cylinder(076, 074); |
| 379 |
cylinder(076, 077); |
| 380 |
/* round corners */ |
| 381 |
sphere(070); |
| 382 |
sphere(071); |
| 383 |
sphere(072); |
| 384 |
sphere(073); |
| 385 |
sphere(074); |
| 386 |
sphere(075); |
| 387 |
sphere(076); |
| 388 |
sphere(077); |
| 389 |
} |
| 390 |
if (bevel == 0.0) { /* only need major faces */ |
| 391 |
side(1, 5, 4, 0); |
| 392 |
side(4, 6, 2, 0); |
| 393 |
side(2, 3, 1, 0); |
| 394 |
side(3, 2, 6, 7); |
| 395 |
side(5, 1, 3, 7); |
| 396 |
side(6, 4, 5, 7); |
| 397 |
} |
| 398 |
if (obj != NULL) { /* need to write output? */ |
| 399 |
if (!smooth) |
| 400 |
removeNormals(obj, 0, 0); |
| 401 |
if (objout) { |
| 402 |
if (rounde) /* joins corners to edges */ |
| 403 |
coalesceVertices(obj, 2.*FTINY); |
| 404 |
if (toOBJ(obj, stdout) <= 0) |
| 405 |
return(1); |
| 406 |
} else if (toRadiance(obj, stdout, 0, 0) <= 0) |
| 407 |
return(1); |
| 408 |
/* freeScene(obj); we're exiting, anyway... */ |
| 409 |
} |
| 410 |
return(0); |
| 411 |
userr: |
| 412 |
fprintf(stderr, "Usage: %s ", argv[0]); |
| 413 |
fprintf(stderr, "material name xsize ysize zsize "); |
| 414 |
fprintf(stderr, "[-i] [-b bevel | -r round [-n nsegs][-s]] [-o]\n"); |
| 415 |
return(1); |
| 416 |
} |
