Used vector constants in all appropriate placed.

src/main/java/com/sk89q/worldedit/commands/ClipboardCommands.java

@@ -64,7 +64,7 @@ public class ClipboardCommands {
         Vector pos = session.getPlacementPosition(player);
 
         CuboidClipboard clipboard = new CuboidClipboard(
-                max.subtract(min).add(new Vector(1, 1, 1)),
+                max.subtract(min).add(Vector.ONE),
                 min, min.subtract(pos));
         clipboard.copy(editSession);
         if (args.hasFlag('e')) {
@@ -107,7 +107,7 @@ public class ClipboardCommands {
         Vector pos = session.getPlacementPosition(player);
 
         CuboidClipboard clipboard = new CuboidClipboard(
-                max.subtract(min).add(new Vector(1, 1, 1)),
+                max.subtract(min).add(Vector.ONE),
                 min, min.subtract(pos));
         clipboard.copy(editSession);
         if (args.hasFlag('e')) {

src/main/java/com/sk89q/worldedit/commands/GenerationCommands.java

@@ -384,17 +384,17 @@ public class GenerationCommands {
         Vector unit;
 
         if (args.hasFlag('r')) {
-            zero = new Vector(0, 0, 0);
+            zero = Vector.ZERO;
-            unit = new Vector(1, 1, 1);
+            unit = Vector.ONE;
         } else if (args.hasFlag('o')) {
             zero = session.getPlacementPosition(player);
-            unit = new Vector(1, 1, 1);
+            unit = Vector.ONE;
         } else if (args.hasFlag('c')) {
             final Vector min = region.getMinimumPoint();
             final Vector max = region.getMaximumPoint();
 
             zero = max.add(min).multiply(0.5);
-            unit = new Vector(1, 1, 1);
+            unit = Vector.ONE;
         } else {
             final Vector min = region.getMinimumPoint();
             final Vector max = region.getMaximumPoint();

src/main/java/com/sk89q/worldedit/commands/RegionCommands.java

@@ -393,11 +393,11 @@ public class RegionCommands {
         Vector unit;
 
         if (args.hasFlag('r')) {
-            zero = new Vector(0, 0, 0);
+            zero = Vector.ZERO;
-            unit = new Vector(1, 1, 1);
+            unit = Vector.ONE;
         } else if (args.hasFlag('o')) {
             zero = session.getPlacementPosition(player);
-            unit = new Vector(1, 1, 1);
+            unit = Vector.ONE;
         } else {
             final Vector min = region.getMinimumPoint();
             final Vector max = region.getMaximumPoint();

src/main/java/com/sk89q/worldedit/commands/SelectionCommands.java

@@ -602,7 +602,7 @@ public class SelectionCommands {
 
             player.print("Size: " + size);
             player.print("Offset: " + offset);
-            player.print("Cuboid distance: " + size.distance( new Vector(1, 1, 1)));
+            player.print("Cuboid distance: " + size.distance(Vector.ONE));
             player.print("# of blocks: " 
                          + (int) (size.getX() * size.getY() * size.getZ()));
             return;

src/main/java/com/sk89q/worldedit/regions/CylinderRegionSelector.java

@@ -90,7 +90,7 @@ public class CylinderRegionSelector implements RegionSelector, CUIRegion {
     }
 
     public boolean selectPrimary(Vector pos) {
-        if (!region.getCenter().equals(new Vector(0, 0, 0)) && pos.compareTo(region.getCenter()) == 0) {
+        if (!region.getCenter().equals(Vector.ZERO) && pos.compareTo(region.getCenter()) == 0) {
             return false;
         }
 
@@ -103,7 +103,7 @@ public class CylinderRegionSelector implements RegionSelector, CUIRegion {
 
     public boolean selectSecondary(Vector pos) {
         Vector center = region.getCenter();
-        if ((center.compareTo(new Vector(0, 0, 0))) == 0) {
+        if ((center.compareTo(Vector.ZERO)) == 0) {
             return true;
         }
 
@@ -124,7 +124,7 @@ public class CylinderRegionSelector implements RegionSelector, CUIRegion {
 
     public void explainSecondarySelection(LocalPlayer player, LocalSession session, Vector pos) {
         Vector center = region.getCenter();
-        if (!center.equals(new Vector(0, 0, 0))) {
+        if (!center.equals(Vector.ZERO)) {
             player.print("Radius set to " + format.format(region.getRadius().getX()) + "/" + format.format(region.getRadius().getZ()) + " blocks. (" + region.getArea() + ").");
         } else {
             player.printError("You must select the center point before setting the radius.");
@@ -159,7 +159,7 @@ public class CylinderRegionSelector implements RegionSelector, CUIRegion {
     }
 
     public boolean isDefined() {
-        return !region.getRadius().equals(new Vector2D(0, 0));
+        return !region.getRadius().equals(Vector2D.ZERO);
     }
 
     public void learnChanges() {
@@ -176,10 +176,10 @@ public class CylinderRegionSelector implements RegionSelector, CUIRegion {
     public List<String> getInformationLines() {
         final List<String> lines = new ArrayList<String>();
 
-        if (!region.getCenter().equals(new Vector(0, 0, 0))) {
+        if (!region.getCenter().equals(Vector.ZERO)) {
             lines.add("Center: " + region.getCenter());
         }
-        if (!region.getRadius().equals(new Vector2D(0, 0))) {
+        if (!region.getRadius().equals(Vector2D.ZERO)) {
             lines.add("Radius: " + region.getRadius());
         }