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#ifndef lint |
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static const char RCSid[] = "$Id$"; |
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static const char RCSid[] = "$Id$"; |
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#endif |
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/* |
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* o_instance.c - routines for computing ray intersections with octrees. |
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*/ |
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/* ==================================================================== |
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* The Radiance Software License, Version 1.0 |
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* |
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* Copyright (c) 1990 - 2002 The Regents of the University of California, |
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* through Lawrence Berkeley National Laboratory. All rights reserved. |
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* |
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* Redistribution and use in source and binary forms, with or without |
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* modification, are permitted provided that the following conditions |
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* are met: |
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* |
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* 1. Redistributions of source code must retain the above copyright |
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* notice, this list of conditions and the following disclaimer. |
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* |
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* 2. Redistributions in binary form must reproduce the above copyright |
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* notice, this list of conditions and the following disclaimer in |
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* the documentation and/or other materials provided with the |
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* distribution. |
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* |
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* 3. The end-user documentation included with the redistribution, |
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* if any, must include the following acknowledgment: |
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* "This product includes Radiance software |
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* (http://radsite.lbl.gov/) |
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* developed by the Lawrence Berkeley National Laboratory |
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* (http://www.lbl.gov/)." |
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* Alternately, this acknowledgment may appear in the software itself, |
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* if and wherever such third-party acknowledgments normally appear. |
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* |
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* 4. The names "Radiance," "Lawrence Berkeley National Laboratory" |
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* and "The Regents of the University of California" must |
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* not be used to endorse or promote products derived from this |
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* software without prior written permission. For written |
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* permission, please contact [email protected]. |
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* |
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* 5. Products derived from this software may not be called "Radiance", |
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* nor may "Radiance" appear in their name, without prior written |
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* permission of Lawrence Berkeley National Laboratory. |
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* |
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED |
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
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* DISCLAIMED. IN NO EVENT SHALL Lawrence Berkeley National Laboratory OR |
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* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF |
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* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND |
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, |
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT |
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* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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* SUCH DAMAGE. |
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* ==================================================================== |
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* |
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* This software consists of voluntary contributions made by many |
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* individuals on behalf of Lawrence Berkeley National Laboratory. For more |
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* information on Lawrence Berkeley National Laboratory, please see |
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* <http://www.lbl.gov/>. |
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*/ |
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#include "copyright.h" |
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#include "ray.h" |
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#include "instance.h" |
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#include "rtotypes.h" |
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o_instance(o, r) /* compute ray intersection with octree */ |
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OBJREC *o; |
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register RAY *r; |
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extern int |
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o_instance( /* compute ray intersection with octree */ |
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OBJREC *o, |
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register RAY *r |
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) |
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{ |
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RAY rcont; |
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register INSTANCE *in; |
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double d; |
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register INSTANCE *ins; |
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register int i; |
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/* get the octree */ |
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in = getinstance(o, IO_ALL); |
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ins = getinstance(o, IO_ALL); |
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/* copy and transform ray */ |
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copystruct(&rcont, r); |
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multp3(rcont.rorg, r->rorg, in->x.b.xfm); |
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multv3(rcont.rdir, r->rdir, in->x.b.xfm); |
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rcont = *r; |
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multp3(rcont.rorg, r->rorg, ins->x.b.xfm); |
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multv3(rcont.rdir, r->rdir, ins->x.b.xfm); |
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for (i = 0; i < 3; i++) |
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rcont.rdir[i] /= in->x.b.sca; |
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rcont.rmax *= in->x.b.sca; |
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rcont.rdir[i] /= ins->x.b.sca; |
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rcont.rmax *= ins->x.b.sca; |
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/* clear and trace it */ |
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rayclear(&rcont); |
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if (!localhit(&rcont, &in->obj->scube)) |
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if (!localhit(&rcont, &ins->obj->scube)) |
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return(0); /* missed */ |
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if (rcont.rot * in->x.f.sca >= r->rot) |
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if (rcont.rot * ins->x.f.sca >= r->rot) |
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return(0); /* not close enough */ |
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if (o->omod != OVOID) { /* if we have modifier, use it */ |
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if (rcont.rox != NULL) { |
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newrayxf(r); /* allocate transformation */ |
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/* NOTE: r->rox may equal rcont.rox! */ |
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multmat4(r->rox->f.xfm, rcont.rox->f.xfm, in->x.f.xfm); |
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r->rox->f.sca = rcont.rox->f.sca * in->x.f.sca; |
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multmat4(r->rox->b.xfm, in->x.b.xfm, rcont.rox->b.xfm); |
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r->rox->b.sca = in->x.b.sca * rcont.rox->b.sca; |
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multmat4(r->rox->f.xfm, rcont.rox->f.xfm, ins->x.f.xfm); |
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r->rox->f.sca = rcont.rox->f.sca * ins->x.f.sca; |
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multmat4(r->rox->b.xfm, ins->x.b.xfm, rcont.rox->b.xfm); |
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r->rox->b.sca = ins->x.b.sca * rcont.rox->b.sca; |
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} else |
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r->rox = &in->x; |
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r->rox = &ins->x; |
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} |
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/* transform it back */ |
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r->rot = rcont.rot * in->x.f.sca; |
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multp3(r->rop, rcont.rop, in->x.f.xfm); |
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multv3(r->ron, rcont.ron, in->x.f.xfm); |
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for (i = 0; i < 3; i++) |
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r->ron[i] /= in->x.f.sca; |
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r->rot = rcont.rot * ins->x.f.sca; |
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multp3(r->rop, rcont.rop, ins->x.f.xfm); |
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multv3(r->ron, rcont.ron, ins->x.f.xfm); |
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multv3(r->pert, rcont.pert, ins->x.f.xfm); |
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d = 1./ins->x.f.sca; |
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for (i = 0; i < 3; i++) { |
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r->ron[i] *= d; |
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r->pert[i] *= d; |
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} |
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r->rod = rcont.rod; |
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r->uv[0] = rcont.uv[0]; |
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r->uv[1] = rcont.uv[1]; |
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/* return hit */ |
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return(1); |
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} |
