--- ray/src/ot/o_instance.c	1991/01/05 09:41:26	1.7
+++ ray/src/ot/o_instance.c	2004/03/27 12:41:45	2.5
@@ -1,21 +1,20 @@
-/* Copyright (c) 1991 Regents of the University of California */
-
 #ifndef lint
-static char SCCSid[] = "$SunId$ LBL";
+static const char RCSid[] = "$Id: o_instance.c,v 2.5 2004/03/27 12:41:45 schorsch Exp $";
 #endif
-
 /*
- *  o_instance.c - routines for creating octrees for other octrees.
- *
- *     11/11/88
+ *  o_instance.c - routines for creating octrees for other octrees
  */
 
 #include  "standard.h"
 
 #include  "object.h"
 
+#include  "octree.h"
+
 #include  "instance.h"
 
+#include  "mesh.h"
+
 #include  "plocate.h"
 
 /*
@@ -41,23 +40,25 @@ static char SCCSid[] = "$SunId$ LBL";
  */
 
 
-o_instance(o, cu)			/* determine if cubes intersect */
-OBJREC  *o;
-CUBE  *cu;
+static int o_cube(CUBE  *cu1, FULLXF  *fxf, CUBE  *cu);
+
+
+static int
+o_cube(			/* determine if cubes intersect */
+	CUBE  *cu1,
+	FULLXF  *fxf,
+	CUBE  *cu
+)
 {
 	static int  vstart[4] = {0, 3, 5, 6};
 	FVECT  cumin, cumax;
 	FVECT  vert[8];
 	FVECT  v1, v2;
-	register INSTANCE  *in;
 	int  vloc, vout;
 	register int  i, j;
-					/* get octree arguments */
-	in = getinstance(o, IO_BOUNDS);
 					/* check if cube vertex in octree */
 	for (j = 0; j < 3; j++)
-		cumax[j] = (cumin[j] = in->obj->scube.cuorg[j]) +
-				in->obj->scube.cusize;
+		cumax[j] = (cumin[j] = cu1->cuorg[j]) + cu1->cusize;
 	vloc = ABOVE | BELOW;
 	vout = 0;
 	for (i = 0; i < 8; i++) {
@@ -66,8 +67,8 @@ CUBE  *cu;
 			if (i & 1<<j)
 				v1[j] += cu->cusize;
 		}
-		multp3(v2, v1, in->x.b.xfm);
-		if (j = plocate(v2, cumin, cumax))
+		multp3(v2, v1, fxf->b.xfm);
+		if ( (j = plocate(v2, cumin, cumax)) )
 			vout++;
 		vloc &= j;
 	}
@@ -83,12 +84,12 @@ CUBE  *cu;
 	vloc = ABOVE | BELOW;
 	for (i = 0; i < 8; i++) {
 		for (j = 0; j < 3; j++) {
-			v1[j] = in->obj->scube.cuorg[j];
+			v1[j] = cu1->cuorg[j];
 			if (i & 1<<j)
-				v1[j] += in->obj->scube.cusize;
+				v1[j] += cu1->cusize;
 		}
-		multp3(vert[i], v1, in->x.f.xfm);
-		if (j = plocate(vert[i], cumin, cumax))
+		multp3(vert[i], v1, fxf->f.xfm);
+		if ( (j = plocate(vert[i], cumin, cumax)) )
 			vloc &= j;
 		else
 			return(O_HIT);	/* vertex inside */
@@ -106,4 +107,34 @@ CUBE  *cu;
 		}
 
 	return(O_MISS);			/* no intersection */
+}
+
+
+/* XXX o_instance() is extern, but not declared in any header file */
+int
+o_instance(			/* determine if instance intersects */
+	OBJREC  *o,
+	CUBE  *cu
+)
+{
+	INSTANCE  *ins;
+					/* get octree bounds */
+	ins = getinstance(o, IO_BOUNDS);
+					/* call o_cube to do the work */
+	return(o_cube(&ins->obj->scube, &ins->x, cu));
+}
+
+
+/* XXX o_mesh() is extern, but not declared in any header file */
+int
+o_mesh(				/* determine if mesh intersects */
+	OBJREC  *o,
+	CUBE  *cu
+)
+{
+	MESHINST	*mip;
+					/* get mesh bounds */
+	mip = getmeshinst(o, IO_BOUNDS);
+					/* call o_cube to do the work */
+	return(o_cube(&mip->msh->mcube, &mip->x, cu));
 }