--- ray/src/hd/rhdisp2.c	1997/11/25 10:48:38	3.7
+++ ray/src/hd/rhdisp2.c	1997/12/05 15:50:43	3.9
@@ -12,6 +12,10 @@ static char SCCSid[] = "$SunId$ SGI";
 #include "rhdisp.h"
 #include "rhdriver.h"
 
+#ifndef MAXDIST
+#define MAXDIST		13	/* maximum distance outside section */
+#endif
+
 extern GCOORD	*getviewcells();
 
 static VIEW	dvw;		/* current view corresponding to beam list */
@@ -158,6 +162,42 @@ int	adopt;
 }
 
 
+cbeamadj(v, hr, vr)		/* adjust our beam list */
+VIEW	*v;
+int	hr, vr;
+{
+	register PACKHEAD	*pa;
+	register int	i;
+	int	n;
+					/* first handle additions */
+	pa = (PACKHEAD *)malloc(xcbeams*sizeof(PACKHEAD));
+	if (xcbeams && pa == NULL)
+		goto memerr;
+	for (i = xcbeams; i--; ) {
+		pa[i].hd = cbeam[ncbeams+i].hd;
+		pa[i].bi = cbeam[ncbeams+i].bi;
+		pa[i].nr = npixels(v, hr, vr, hdlist[pa[i].hd], pa[i].bi);
+	}
+	n = xcbeams;			/* now sort list for deletions */
+	cbeamsort(0);
+	pa = (PACKHEAD *)realloc((char *)pa, (n+xcbeams)*sizeof(PACKHEAD));
+	if (n+xcbeams && pa == NULL)
+		goto memerr;
+	for (i = xcbeams; i--; ) {
+		pa[n+i].hd = cbeam[ncbeams+i].hd;
+		pa[n+i].bi = cbeam[ncbeams+i].bi;
+		pa[n+i].nr = 0;
+	}
+	n += xcbeams;
+	xcbeams = 0;			/* delete orphans */
+	serv_request(DR_ADJSET, n*sizeof(PACKHEAD), (char *)pa);
+	free((char *)pa);
+	return;
+memerr:
+	error(SYSTEM, "out of memory in cbeamadj");
+}
+
+
 cbeamop(op, bl, n, v, hr, vr)	/* update beams on server list */
 int	op;
 register struct beamcomp	*bl;
@@ -259,6 +299,11 @@ FVECT	vp;
 			n++;
 		}
 	}
+					/* check for really stupid move */
+	if (bestd > MAXDIST) {
+		error(WARNING, "move to outer solar system");
+		return(0);
+	}
 					/* warn of dangerous moves */
 	if (n < lastn && bestd >= lastd)
 		error(WARNING, "moving outside holodeck section");
@@ -406,7 +451,7 @@ beam_sync()		/* synchronize beams on server */
 }
 
 
-beam_view(vn)			/* change beam view */
+beam_view(vn)			/* change beam view (if advisable) */
 VIEW	*vn;
 {
 	struct cellact	ca;
@@ -418,10 +463,14 @@ VIEW	*vn;
 		cbeamop(DR_DELSET, cbeam, ncbeams, NULL, 0, 0);
 		ncbeams = 0;
 		copystruct(&dvw, vn);
-		return;
+		return(1);
 	}
 					/* find our new voxels */
 	n = get_voxels(vlnew, vn->vp);
+	if (dvw.type && !n) {
+		copystruct(vn, &dvw);		/* cancel move */
+		return(0);
+	}
 					/* set the new voxels */
 	comn = set_voxels(vlnew, n);
 	if (!dvw.type)
@@ -432,6 +481,9 @@ VIEW	*vn;
 			mvview(ca.vi, &dvw, vn);
 		else			/* else add all new cells */
 			doview(&ca, vn);
+#if 1
+	cbeamadj(vn, odev.hres, odev.vres);
+#else
 					/* inform server of new beams */
 	cbeamop(DR_ADDSET, cbeam+ncbeams, xcbeams, vn, odev.hres, odev.vres);
 					/* sort list to put orphans at end */
@@ -439,5 +491,7 @@ VIEW	*vn;
 					/* tell server to delete orphans */
 	cbeamop(DR_DELSET, cbeam+ncbeams, xcbeams, NULL, 0, 0);
 	xcbeams = 0;			/* truncate our list */
+#endif
 	copystruct(&dvw, vn);		/* record new view */
+	return(1);
 }