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/* Copyright (c) 1987 Regents of the University of California */ |
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|
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#ifndef lint |
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static char SCCSid[] = "$SunId$ LBL"; |
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#endif |
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|
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/* |
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* bbox.c - routines for bounding box computation. |
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* |
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* 8/4/87 |
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*/ |
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|
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#include "standard.h" |
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|
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#include "object.h" |
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|
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#include "otypes.h" |
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|
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#include "face.h" |
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|
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#include "cone.h" |
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|
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#include "instance.h" |
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|
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|
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add2bbox(o, bbmin, bbmax) /* expand bounding box to fit object */ |
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register OBJREC *o; |
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FVECT bbmin, bbmax; |
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{ |
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CONE *co; |
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FACE *fo; |
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INSTANCE *io; |
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FVECT v; |
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register int i, j; |
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|
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switch (o->otype) { |
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case OBJ_SPHERE: |
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case OBJ_BUBBLE: |
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if (o->oargs.nfargs != 4) |
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objerror(o, USER, "bad arguments"); |
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for (i = 0; i < 3; i++) { |
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VCOPY(v, o->oargs.farg); |
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v[i] -= o->oargs.farg[3]; |
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point2bbox(v, bbmin, bbmax); |
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v[i] += 2.0 * o->oargs.farg[3]; |
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point2bbox(v, bbmin, bbmax); |
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} |
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break; |
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case OBJ_FACE: |
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fo = getface(o); |
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j = fo->nv; |
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while (j--) |
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point2bbox(VERTEX(fo,j), bbmin, bbmax); |
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break; |
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case OBJ_CONE: |
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case OBJ_CUP: |
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case OBJ_CYLINDER: |
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case OBJ_TUBE: |
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case OBJ_RING: |
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co = getcone(o, 0); |
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if (o->otype != OBJ_RING) |
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circle2bbox(CO_P0(co), co->ad, CO_R0(co), bbmin, bbmax); |
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circle2bbox(CO_P1(co), co->ad, CO_R1(co), bbmin, bbmax); |
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break; |
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case OBJ_INSTANCE: |
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io = getinstance(o, GET_BOUNDS); |
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for (j = 0; j < 8; j++) { |
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for (i = 0; i < 3; i++) { |
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v[i] = io->obj->scube.cuorg[i]; |
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if (j & 1<<i) |
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v[i] += io->obj->scube.cusize; |
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} |
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multp3(v, v, io->f.xfm); |
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point2bbox(v, bbmin, bbmax); |
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} |
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break; |
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} |
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} |
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|
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|
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point2bbox(p, bbmin, bbmax) /* expand bounding box to fit point */ |
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register FVECT p, bbmin, bbmax; |
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{ |
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register int i; |
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|
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for (i = 0; i < 3; i++) { |
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if (p[i] < bbmin[i]) |
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bbmin[i] = p[i]; |
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if (p[i] > bbmax[i]) |
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bbmax[i] = p[i]; |
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} |
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} |
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|
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|
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circle2bbox(cent, norm, rad, bbmin, bbmax) /* expand bbox to fit circle */ |
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FVECT cent, norm; |
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double rad; |
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FVECT bbmin, bbmax; |
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{ |
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FVECT v1, v2; |
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register int i, j; |
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|
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for (i = 0; i < 3; i++) { |
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v1[0] = v1[1] = v1[2] = 0; |
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v1[i] = 1.0; |
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fcross(v2, norm, v1); |
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if (normalize(v2) == 0.0) |
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continue; |
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for (j = 0; j < 3; j++) |
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v1[j] = cent[j] + rad*v2[j]; |
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point2bbox(v1, bbmin, bbmax); |
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for (j = 0; j < 3; j++) |
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v1[j] = cent[j] - rad*v2[j]; |
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point2bbox(v1, bbmin, bbmax); |
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} |
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} |
