| 1 |
#ifndef lint
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| 2 |
static const char RCSid[] = "$Id: genbox.c,v 2.12 2021/04/09 18:52:57 greg Exp $";
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#endif
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| 4 |
/*
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| 5 |
* genbox.c - generate a parallelepiped.
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| 6 |
*
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| 7 |
* 1/8/86
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*/
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| 10 |
#include "rtio.h"
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| 11 |
#include "rtmath.h"
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#include "objutil.h"
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#include <stdlib.h>
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| 14 |
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| 15 |
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| 16 |
char *progname;
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| 17 |
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| 18 |
int verbose = 0;
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| 19 |
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| 20 |
char let[]="0123456789._ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
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| 21 |
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| 22 |
char *cmtype; /* ppd material type */
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| 23 |
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| 24 |
char *cname; /* ppd name */
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| 25 |
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| 26 |
double size[3]; /* ppd size */
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| 28 |
int rounde = 0; /* round edges? (#segments = 2^rounde) */
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| 30 |
double bevel = 0.0; /* bevel amount or round edge radius */
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| 31 |
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| 32 |
int rev = 0; /* boolean true for reversed normals */
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| 33 |
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| 34 |
Scene *obj = NULL; /* save as .OBJ scene if not NULL */
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int vid[0100]; /* vertex ID's for .OBJ scene */
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| 37 |
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| 38 |
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static int
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overtex(int v) /* index a .OBJ vertex */
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{
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| 42 |
double vpos[3];
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int i;
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| 45 |
if (vid[v] >= 0) /* already have this vertex? */
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return(vid[v]);
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/* else create new ID */
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for (i = 0; i < 3; i++)
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| 49 |
if (v>>i & 010)
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vpos[i] = (v>>i & 01)^rev ? size[i]-bevel : bevel;
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else
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vpos[i] = (v>>i & 01)^rev ? size[i] : 0.0;
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| 53 |
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| 54 |
return(vid[v] = addVertex(obj, vpos[0], vpos[1], vpos[2]));
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}
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| 57 |
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static int
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onormal(int vid1, int vid2, int vid3) /* index a .OBJ normal */
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{
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double *p1 = obj->vert[vid1].p;
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double *p2 = obj->vert[vid2].p;
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double *p3 = obj->vert[vid3].p;
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FVECT sv1, sv2, nrm;
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| 65 |
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VSUB(sv1, p2, p1);
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| 67 |
VSUB(sv2, p3, p2);
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VCROSS(nrm, sv1, sv2);
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return(addNormal(obj, nrm[0], nrm[1], nrm[2]));
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}
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static void
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vertex(int v) /* print a Radiance vertex */
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{
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| 77 |
int i;
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| 79 |
for (i = 0; i < 3; i++) {
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| 80 |
if (v & 010)
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| 81 |
printf("\t%18.12g", (v&01)^rev ? size[i]-bevel : bevel);
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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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| 89 |
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static void
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side(int a, int b, int c, int d) /* generate a rectangular face */
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{
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if (obj != NULL) { /* working on .OBJ? */
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VNDX quadv[4];
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| 95 |
memset(quadv, 0xff, sizeof(quadv));
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| 96 |
quadv[0][0] = overtex(a);
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| 97 |
quadv[1][0] = overtex(b);
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| 98 |
quadv[2][0] = overtex(c);
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| 99 |
quadv[3][0] = overtex(d);
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if (rounde) /* add normal if rounded */
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quadv[0][2] = quadv[1][2] = quadv[2][2] = quadv[3][2]
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= onormal(quadv[0][0], quadv[1][0], quadv[2][0]);
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addFace(obj, quadv, 4);
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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%c\n", cmtype, cname,
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let[a], let[b], let[c], let[d]);
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printf("0\n0\n12\n");
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vertex(a);
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vertex(b);
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vertex(c);
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vertex(d);
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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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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;
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const int vid0 = overtex(v0);
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const int vid1 = overtex(v1);
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FVECT p0, p1;
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FVECT axis[2], voff;
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int previd[2];
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int prenid;
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VNDX quadv[4];
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double coef[2];
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int i, j;
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| 155 |
/* need to copy b/c realloc */
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VCOPY(p0, obj->vert[vid0].p);
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| 157 |
VCOPY(p1, obj->vert[vid1].p);
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| 159 |
memset(axis, 0, sizeof(axis));
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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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| 174 |
}
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| 175 |
previd[0] = addVertex(obj, p0[0]+axis[0][0],
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| 176 |
p0[1]+axis[0][1], p0[2]+axis[0][2]);
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| 177 |
previd[1] = addVertex(obj, p1[0]+axis[0][0],
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| 178 |
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);
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for (j = 0; j < 3; j++)
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voff[j] = coef[0]*axis[0][j] + coef[1]*axis[1][j];
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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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static void /* recursive corner subdivision */
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osubcorner(const FVECT orig, const FVECT c0, const FVECT c1, const FVECT c2, int lvl)
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{
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| 215 |
if (lvl-- <= 0) { /* reached terminal depth? */
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const int nsgn = 1 - 2*rev;
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FVECT vpos;
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VNDX triv[3]; /* output smoothed triangle */
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VSUM(vpos, orig, c0, bevel);
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triv[0][0] = addVertex(obj, vpos[0], vpos[1], vpos[2]);
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triv[0][2] = addNormal(obj, c0[0]*nsgn, c0[1]*nsgn, c0[2]*nsgn);
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VSUM(vpos, orig, c1, bevel);
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triv[1][0] = addVertex(obj, vpos[0], vpos[1], vpos[2]);
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triv[1][2] = addNormal(obj, c1[0]*nsgn, c1[1]*nsgn, c1[2]*nsgn);
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VSUM(vpos, orig, c2, bevel);
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triv[2][0] = addVertex(obj, vpos[0], vpos[1], vpos[2]);
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triv[2][2] = addNormal(obj, c2[0]*nsgn, c2[1]*nsgn, c2[2]*nsgn);
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triv[0][1] = triv[1][1] = triv[2][1] = -1;
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addFace(obj, triv, 3);
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} else { /* else subdivide 4 subcorners */
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FVECT m01, m12, m20;
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VADD(m01, c0, c1); normalize(m01);
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VADD(m12, c1, c2); normalize(m12);
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VADD(m20, c2, c0); normalize(m20);
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osubcorner(orig, c0, m01, m20, lvl);
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osubcorner(orig, c1, m12, m01, lvl);
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| 237 |
osubcorner(orig, c2, m20, m12, lvl);
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| 238 |
osubcorner(orig, m01, m12, m20, lvl);
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| 239 |
}
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| 240 |
}
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| 241 |
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| 242 |
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| 243 |
static void
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| 244 |
sphere(int v0) /* generate a rounded corner */
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{
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| 246 |
if (obj != NULL) { /* segmenting for .OBJ? */
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FVECT orig, cdir[3];
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| 248 |
int i;
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| 249 |
memset(cdir, 0, sizeof(cdir));
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| 250 |
for (i = 0; i < 3; i++)
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| 251 |
cdir[i][i] = 2*((v0>>i & 01)^rev) - 1;
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| 252 |
switch (v0 & 07) {
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| 253 |
case 0:
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| 254 |
case 3:
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| 255 |
case 5:
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| 256 |
case 6:
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| 257 |
VCOPY(orig, cdir[0]);
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| 258 |
VCOPY(cdir[0], cdir[1]);
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| 259 |
VCOPY(cdir[1], orig);
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| 260 |
}
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| 261 |
i = overtex(v0);
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| 262 |
VCOPY(orig, obj->vert[i].p); /* realloc remedy */
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| 263 |
osubcorner(orig, cdir[0], cdir[1], cdir[2], rounde);
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return;
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| 265 |
}
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/* Radiance output */
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| 267 |
printf("\n%s sphere %s.%c\n", cmtype, cname, let[v0]);
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| 268 |
printf("0\n0\n4\n");
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| 269 |
vertex(v0);
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| 270 |
printf("\t%18.12g\n", bevel);
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| 271 |
}
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| 272 |
|
| 273 |
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| 274 |
int
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| 275 |
main(int argc, char *argv[])
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| 276 |
{
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| 277 |
int smooth = 0;
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| 278 |
int nsegs = 1;
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| 279 |
int objout = 0;
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| 280 |
int i;
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| 281 |
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| 282 |
progname = argv[0];
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| 283 |
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| 284 |
if (argc < 6)
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| 285 |
goto userr;
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| 286 |
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| 287 |
cmtype = argv[1];
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| 288 |
cname = argv[2];
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| 289 |
size[0] = atof(argv[3]);
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| 290 |
size[1] = atof(argv[4]);
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| 291 |
size[2] = atof(argv[5]);
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| 292 |
if ((size[0] <= 0.0) | (size[1] <= 0.0) | (size[2] <= 0.0))
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| 293 |
goto userr;
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| 294 |
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| 295 |
for (i = 6; i < argc; i++) {
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| 296 |
if (argv[i][0] != '-')
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| 297 |
goto userr;
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| 298 |
switch (argv[i][1]) {
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| 299 |
case 'o': /* requesting .OBJ output */
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| 300 |
objout = 1;
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| 301 |
break;
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| 302 |
case 'i': /* invert surface normals */
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| 303 |
rev = 1;
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| 304 |
break;
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| 305 |
case 's': /* normal smoothing? */
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| 306 |
smooth = 1;
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| 307 |
break;
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| 308 |
case 'r': /* rounded edges/corners */
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| 309 |
rounde = 1;
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| 310 |
/* fall through */
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| 311 |
case 'b': /* beveled edges */
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| 312 |
bevel = atof(argv[++i]);
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| 313 |
if (bevel <= 0.0)
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| 314 |
goto userr;
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| 315 |
break;
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| 316 |
case 'n': /* #segments for rounding */
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| 317 |
nsegs = atoi(argv[++i]);
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| 318 |
if (nsegs <= 0)
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| 319 |
goto userr;
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| 320 |
break;
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| 321 |
default:
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| 322 |
goto userr;
|
| 323 |
}
|
| 324 |
}
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| 325 |
if ((objout|rev) & (nsegs==1)) /* default to 32 segments/edge */
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| 326 |
nsegs = 32;
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| 327 |
if (rounde) { /* rounding edges/corners? */
|
| 328 |
--nsegs;
|
| 329 |
while ((nsegs >>= 1)) /* segmentation requested? */
|
| 330 |
++rounde;
|
| 331 |
}
|
| 332 |
if (rounde > 1 || objout) { /* save as .OBJ scene? */
|
| 333 |
obj = newScene();
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| 334 |
setMaterial(obj, cmtype);
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| 335 |
setGroup(obj, cname);
|
| 336 |
memset(vid, 0xff, sizeof(vid));
|
| 337 |
}
|
| 338 |
fputs("# ", stdout); /* write command as comment */
|
| 339 |
printargs(argc, argv, stdout);
|
| 340 |
|
| 341 |
if (bevel > 0.0) { /* minor faces */
|
| 342 |
side(051, 055, 054, 050);
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| 343 |
side(064, 066, 062, 060);
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| 344 |
side(032, 033, 031, 030);
|
| 345 |
side(053, 052, 056, 057);
|
| 346 |
side(065, 061, 063, 067);
|
| 347 |
side(036, 034, 035, 037);
|
| 348 |
}
|
| 349 |
if (bevel > 0.0 && !rounde) { /* bevel faces */
|
| 350 |
side(031, 051, 050, 030);
|
| 351 |
side(060, 062, 032, 030);
|
| 352 |
side(050, 054, 064, 060);
|
| 353 |
side(034, 036, 066, 064);
|
| 354 |
side(037, 057, 056, 036);
|
| 355 |
side(052, 062, 066, 056);
|
| 356 |
side(052, 053, 033, 032);
|
| 357 |
side(057, 067, 063, 053);
|
| 358 |
side(061, 031, 033, 063);
|
| 359 |
side(065, 067, 037, 035);
|
| 360 |
side(055, 051, 061, 065);
|
| 361 |
side(034, 054, 055, 035);
|
| 362 |
/* bevel corners */
|
| 363 |
corner(030, 050, 060);
|
| 364 |
corner(051, 031, 061);
|
| 365 |
corner(032, 062, 052);
|
| 366 |
corner(064, 054, 034);
|
| 367 |
corner(036, 056, 066);
|
| 368 |
corner(065, 035, 055);
|
| 369 |
corner(053, 063, 033);
|
| 370 |
corner(037, 067, 057);
|
| 371 |
}
|
| 372 |
if (bevel > 0.0 && rounde) { /* round edges */
|
| 373 |
cylinder(070, 071);
|
| 374 |
cylinder(070, 074);
|
| 375 |
cylinder(070, 072);
|
| 376 |
cylinder(073, 071);
|
| 377 |
cylinder(073, 072);
|
| 378 |
cylinder(073, 077);
|
| 379 |
cylinder(075, 071);
|
| 380 |
cylinder(075, 074);
|
| 381 |
cylinder(075, 077);
|
| 382 |
cylinder(076, 072);
|
| 383 |
cylinder(076, 074);
|
| 384 |
cylinder(076, 077);
|
| 385 |
/* round corners */
|
| 386 |
sphere(070);
|
| 387 |
sphere(071);
|
| 388 |
sphere(072);
|
| 389 |
sphere(073);
|
| 390 |
sphere(074);
|
| 391 |
sphere(075);
|
| 392 |
sphere(076);
|
| 393 |
sphere(077);
|
| 394 |
}
|
| 395 |
if (bevel == 0.0) { /* only need major faces */
|
| 396 |
side(1, 5, 4, 0);
|
| 397 |
side(4, 6, 2, 0);
|
| 398 |
side(2, 3, 1, 0);
|
| 399 |
side(3, 2, 6, 7);
|
| 400 |
side(5, 1, 3, 7);
|
| 401 |
side(6, 4, 5, 7);
|
| 402 |
}
|
| 403 |
if (obj != NULL) { /* need to write output? */
|
| 404 |
if (!smooth)
|
| 405 |
removeNormals(obj, 0, 0);
|
| 406 |
if (objout) {
|
| 407 |
if (rounde) /* joins corners to edges */
|
| 408 |
coalesceVertices(obj, 2.*FTINY);
|
| 409 |
if (toOBJ(obj, stdout) <= 0)
|
| 410 |
return(1);
|
| 411 |
} else if (toRadiance(obj, stdout, 0, 0) <= 0)
|
| 412 |
return(1);
|
| 413 |
/* freeScene(obj); we're exiting, anyway... */
|
| 414 |
}
|
| 415 |
return(0);
|
| 416 |
userr:
|
| 417 |
fprintf(stderr, "Usage: %s ", argv[0]);
|
| 418 |
fprintf(stderr, "material name xsize ysize zsize ");
|
| 419 |
fprintf(stderr, "[-i] [-b bevel | -r round [-n nsegs][-s]] [-o]\n");
|
| 420 |
return(1);
|
| 421 |
}
|
