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/* Copyright (c) 1998 Silicon Graphics, Inc. */ |
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#ifndef lint |
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static char SCCSid[] = "$SunId$ SGI"; |
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static const char RCSid[] = "$Id$"; |
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#endif |
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/* |
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* m_clip.c - routine for clipped (cut) objects. |
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* |
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* 3/17/86 |
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*/ |
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#include "copyright.h" |
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#include "ray.h" |
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#include "rtotypes.h" |
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/* |
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* Clipping objects permit holes and sections to be taken out |
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*/ |
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m_clip(m, r) /* clip objects from ray */ |
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register OBJREC *m; |
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register RAY *r; |
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extern int |
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m_clip( /* clip objects from ray */ |
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register OBJREC *m, |
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register RAY *r |
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) |
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{ |
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OBJECT cset[MAXSET+1], *modset; |
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OBJECT obj, mod; |
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} |
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m->os = (char *)modset; |
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} |
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if (r == NULL) |
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return(0); /* just initializing */ |
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if (r->clipset != NULL) |
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setcopy(cset, r->clipset); |
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else |
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r->newcset = cset; |
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if (strcmp(m->oargs.sarg[0], VOIDID)) { |
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int inside = 0; |
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register RAY *rp; |
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register const RAY *rp; |
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/* check for penetration */ |
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for (rp = r; rp->parent != NULL; rp = rp->parent) |
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if (!(rp->rtype & RAYREFL) && rp->parent->ro != NULL |
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&& inset(modset, rp->parent->ro->omod)) |
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&& inset(modset, rp->parent->ro->omod)) { |
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if (rp->parent->rod > 0.0) |
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inside++; |
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else |
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inside--; |
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} |
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if (inside > 0) { /* we just hit the object */ |
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flipsurface(r); |
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return(rayshade(r, lastmod(obj, m->oargs.sarg[0]))); |
