feature request from peach, remove selected objects from 1 group.

Also made rem_from_group return if it removed the object which save some looping.

Added a node in the blender help message that background mode dosnt load the .B.blend file as a bug was reported recently because of this.

source/blender/blenkernel/BKE_group.h

@@ -44,7 +44,7 @@ void		free_group(struct Group *group);
 void		unlink_group(struct Group *group);
 struct Group *add_group(char *name);
 void		add_to_group(struct Group *group, struct Object *ob);
-void		rem_from_group(struct Group *group, struct Object *ob);
+int			rem_from_group(struct Group *group, struct Object *ob);
 struct Group *find_group(struct Object *ob, struct Group *group);
 int			object_in_group(struct Object *ob, struct Group *group);
 int			group_is_animated(struct Object *parent, struct Group *group);

source/blender/blenkernel/intern/group.c

@@ -134,11 +134,11 @@ void add_to_group(Group *group, Object *ob)
 }
 
 /* also used for ob==NULL */
-void rem_from_group(Group *group, Object *ob)
+int rem_from_group(Group *group, Object *ob)
 {
 	GroupObject *go, *gon;
-	
-	if(group==NULL) return;
+	int removed = 0;
+	if(group==NULL) return 0;
 	
 	go= group->gobject.first;
 	while(go) {
@@ -146,9 +146,12 @@ void rem_from_group(Group *group, Object *ob)
 		if(go->ob==ob) {
 			BLI_remlink(&group->gobject, go);
 			free_group_object(go);
+			removed = 1;
+			/* should break here since an object being in a group twice cant happen? */
 		}
 		go= gon;
 	}
+	return removed;
 }
 
 int object_in_group(Object *ob, Group *group)

source/blender/src/buttons_object.c

@@ -2492,8 +2492,7 @@ static void group_ob_rem(void *gr_v, void *ob_v)
 {
 	Object *ob= OBACT;
 	
-	rem_from_group(gr_v, ob);
-	if(find_group(ob, NULL)==NULL) {
+	if(rem_from_group(gr_v, ob) && find_group(ob, NULL)==NULL) {
 		ob->flag &= ~OB_FROMGROUP;
 		BASACT->flag &= ~OB_FROMGROUP;
 	}

source/blender/src/editgroup.c

@@ -112,7 +112,7 @@ void add_selected_to_act_ob_groups(void)
 }
 
 
-void rem_selected_from_group(void)
+void rem_selected_from_all_groups(void)
 {
 	Base *base;
 	Group *group;
@@ -134,6 +134,77 @@ void rem_selected_from_group(void)
 	BIF_undo_push("Remove from Group");
 }
 
+
+void rem_selected_from_group(void)
+{
+	char menutext[30+(22*22)], *menupt;
+	int i=0;
+	short ret;
+	Group *group= NULL;
+	Object *ob;
+	Base *base;
+	Group *group_array[24] = {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0};
+	
+	/* UnSet Tags for Objects and Groups */
+	for(group= G.main->group.first; group; group= group->id.next) {
+		if(group->id.lib==NULL) {
+			group->id.flag &= ~LIB_DOIT;
+		}
+	}
+	for(ob=G.main->object.first; ob; ob= ob->id.next) {
+		ob->id.flag &= ~LIB_DOIT;
+	}
+	
+	/* Not tag selected objects */
+	for(base=FIRSTBASE; base; base= base->next) {
+		if TESTBASELIB(base) {
+			base->object->id.flag |= LIB_DOIT;
+		}
+	}
+	
+	menupt = menutext;
+	/* Build a list of groups that contain selected objects */
+	for(group= G.main->group.first; group && i<24; group= group->id.next) {
+		if(group->id.lib==NULL) {
+			GroupObject *go;
+			for(go= group->gobject.first; go; go= go->next) {
+				if(go->ob->id.flag & LIB_DOIT) {
+					group_array[i] = group;
+					menupt += sprintf(menupt, "|%s", group->id.name+2);
+					i++;
+					break; /* Only want to know if this group should go in the list*/
+				}
+			}
+		}
+	}
+	
+	/* do we have any groups? */
+	if (group_array[0] == NULL) {
+		error("Object selection contains no groups");
+	} else {
+		ret = pupmenu(menutext);
+		if (ret==-1) {
+			return;
+		} else { 
+			group = group_array[ret-1];
+			for(base=FIRSTBASE; base; base= base->next) {
+				if TESTBASELIB(base) {
+					/* if we are removed and are not in any group, set our flag */
+					if(rem_from_group(group, base->object) && find_group(base->object, NULL)==NULL) {
+						base->object->flag &= ~OB_FROMGROUP;
+						base->flag &= ~OB_FROMGROUP;
+					}
+				}
+			}
+		}
+	}
+	
+	allqueue(REDRAWVIEW3D, 0);
+	allqueue(REDRAWBUTSOBJECT, 0);
+	DAG_scene_sort(G.scene);
+	BIF_undo_push("Remove from Group");
+}
+
 void group_operation_with_menu(void)
 {
 	Group *group= NULL;
@@ -145,7 +216,7 @@ void group_operation_with_menu(void)
 			break;
 	
 	if(group)
-		mode= pupmenu("Groups %t|Add to Existing Group %x3|Add to Active Objects Groups %x4|Add to New Group %x1|Remove from All Groups %x2");
+		mode= pupmenu("Groups %t|Add to Existing Group %x3|Add to Active Objects Groups %x4|Add to New Group %x1|Remove from Group %x5|Remove from All Groups %x2");
 	else
 		mode= pupmenu("Groups %t|Add to New Group %x1|Remove from All Groups %x2");
 	
@@ -181,6 +252,7 @@ void group_operation(int mode)
 		
 		if(mode==4) add_selected_to_act_ob_groups();
 		else if(mode==1 || mode==3) add_selected_to_group(group);
-		else if(mode==2) rem_selected_from_group();
+		else if(mode==2) rem_selected_from_all_groups();
+		else if(mode==5) rem_selected_from_group();
 	}
 }

source/creator/creator.c

@@ -182,7 +182,7 @@ static void print_help(void)
 	printf ("  ...may not render to /tmp because loading the blend file overwrites the output path that was set\n");
 	printf ("    \"blender -b test.blend -o /tmp -f 1\" works as expected.\n");
 	printf ("\nRender options:\n");
-	printf ("  -b <file>\tRender <file> in background\n");
+	printf ("  -b <file>\tRender <file> in background (doesn't load the user defaults .B.blend file)\n");
 	printf ("    -a render frames from start to end (inclusive), only works when used after -b\n");
 	printf ("    -S <name>\tSet scene <name>\n");
 	printf ("    -f <frame>\tRender frame <frame> and save it\n");