Index: trunk/src/data.c
===================================================================
--- trunk/src/data.c	(revision 38446)
+++ trunk/src/data.c	(revision 38447)
@@ -240,10 +240,24 @@
 
 rnd_box_t *pcb_data_bbox(rnd_box_t *out, pcb_data_t *Data, rnd_bool ignore_floaters)
 {
+	pcb_layer_t *aux = NULL;
+
 	/* preset identifiers with highest and lowest possible values */
 	out->X1 = out->Y1 = RND_MAX_COORD;
 	out->X2 = out->Y2 = -RND_MAX_COORD;
 
+	if (ignore_floaters) {
+		long n;
+
+		for(n = 0; n < Data->LayerN; n++) {
+			if (strcmp(Data->Layer[n].name, SUBC_AUX_NAME) == 0) {
+				aux = Data->Layer + n;
+				break;
+			}
+		}
+	}
+
+
 	/* now scan for the lowest/highest X and Y coordinate */
 	PCB_PADSTACK_LOOP(Data);
 	{
@@ -262,6 +276,7 @@
 	PCB_LINE_ALL_LOOP(Data);
 	{
 		pcb_line_bbox(line);
+		if (ignore_floaters && (aux != NULL) && (line->parent.layer == aux)) continue; /* ignore aux layer objects */
 		if (!ignore_floaters || !PCB_FLAG_TEST(PCB_FLAG_FLOATER, line))
 			rnd_box_bump_box(out, &line->BoundingBox);
 	}
Index: trunk/src/data.h
===================================================================
--- trunk/src/data.h	(revision 38446)
+++ trunk/src/data.h	(revision 38447)
@@ -130,10 +130,11 @@
 
 rnd_bool pcb_data_is_empty(pcb_data_t *);
 
-/* gets minimum and maximum coordinates
- * returns NULL if layout is empty */
-rnd_box_t *pcb_data_bbox(rnd_box_t *out, pcb_data_t *Data, rnd_bool ignore_floaters);
-rnd_box_t *pcb_data_bbox_naked(rnd_box_t *out, pcb_data_t *Data, rnd_bool ignore_floaters);
+/* Gets minimum and maximum coordinates; returns NULL if data is empty;
+   If ignore_floaters_and_aux is true, floaters and aux layer objects
+   (unity vectors) are not considered for the bbox. */
+rnd_box_t *pcb_data_bbox(rnd_box_t *out, pcb_data_t *Data, rnd_bool ignore_floaters_and_aux);
+rnd_box_t *pcb_data_bbox_naked(rnd_box_t *out, pcb_data_t *Data, rnd_bool ignore_floaters_and_aux);
 
 /* Make sure all layers of data has their .parent field pointing to the data */
 void pcb_data_set_layer_parents(pcb_data_t *data);
@@ -253,4 +254,6 @@
    bytes long. Returns NULL if data is not the pcb or a buffer. */
 const char *pcb_data_to_name(pcb_board_t *pcb, pcb_data_t *data, char *buf, int buf_len);
 
+#define SUBC_AUX_NAME "subc-aux"
+
 #endif
Index: trunk/src/obj_subc.c
===================================================================
--- trunk/src/obj_subc.c	(revision 38446)
+++ trunk/src/obj_subc.c	(revision 38447)
@@ -63,8 +63,6 @@
 #include <librnd/hid/hid_inlines.h>
 #include "extobj.h"
 
-#define SUBC_AUX_NAME "subc-aux"
-
 static const char core_subc_cookie[] = "core-subc";
 
 void pcb_subc_reg(pcb_data_t *data, pcb_subc_t *subc)