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root/Development/ray/src/rt/raytrace.c

Comparing ray/src/rt/raytrace.c (file contents):
Revision 1.11 by greg, Sat Aug 18 04:25:59 1990 UTC vs.
Revision 1.14 by greg, Tue Feb 12 12:57:07 1991 UTC

#	Line 1 | Line 1
1	<	/* Copyright (c) 1986 Regents of the University of California */
1	>	/* Copyright (c) 1990 Regents of the University of California */
2
3		#ifndef lint
4		static char SCCSid[] = "$SunId$ LBL";
#	Line 230 | Line 230 | register RAY  *r;
230		newdot = -newdot;
231		}
232		return(newdot);
233	+	}
234	+
235	+
236	+	newrayxf(r)                     /* get new tranformation matrix for ray */
237	+	RAY  *r;
238	+	{
239	+	static struct xfn {
240	+	struct xfn  *next;
241	+	FULLXF  xf;
242	+	}  xfseed = { &xfseed }, *xflast = &xfseed;
243	+	register struct xfn  *xp;
244	+	register RAY  *rp;
245	+
246	+	/*
247	+	* Search for transform in circular list that
248	+	* has no associated ray in the tree.
249	+	*/
250	+	xp = xflast;
251	+	for (rp = r->parent; rp != NULL; rp = rp->parent)
252	+	if (rp->rox == &xp->xf) {               /* xp in use */
253	+	xp = xp->next;                  /* move to next */
254	+	if (xp == xflast) {             /* need new one */
255	+	xp = (struct xfn *)bmalloc(sizeof(struct xfn));
256	+	if (xp == NULL)
257	+	error(SYSTEM,
258	+	"out of memory in newrayxf");
259	+	/* insert in list */
260	+	xp->next = xflast->next;
261	+	xflast->next = xp;
262	+	break;                  /* we're done */
263	+	}
264	+	rp = r;                 /* start check over */
265	+	}
266	+	/* got it */
267	+	r->rox = &xp->xf;
268	+	xflast = xp;
269		}
270
271

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