Added constants to Vector2D, BlockVector and BlockVector2D and made the ones in Vector final.

src/main/java/com/sk89q/worldedit/BlockVector.java

@@ -25,6 +25,12 @@ package com.sk89q.worldedit;
  * @author sk89q
  */
 public class BlockVector extends Vector {
+    public static final BlockVector ZERO = new BlockVector(0, 0, 0);
+    public static final BlockVector UNIT_X = new BlockVector(1, 0, 0);
+    public static final BlockVector UNIT_Y = new BlockVector(0, 1, 0);
+    public static final BlockVector UNIT_Z = new BlockVector(0, 0, 1);
+    public static final BlockVector ONE = new BlockVector(1, 1, 1);
+
     /**
      * Construct the Vector object.
      *

src/main/java/com/sk89q/worldedit/BlockVector2D.java

@@ -25,6 +25,11 @@ package com.sk89q.worldedit;
  * @author sk89q
  */
 public class BlockVector2D extends Vector2D {
+    public static final BlockVector2D ZERO = new BlockVector2D(0, 0);
+    public static final BlockVector2D UNIT_X = new BlockVector2D(1, 0);
+    public static final BlockVector2D UNIT_Z = new BlockVector2D(0, 1);
+    public static final BlockVector2D ONE = new BlockVector2D(1, 1);
+
     /**
      * Construct the Vector object.
      *

src/main/java/com/sk89q/worldedit/Vector.java

@@ -24,11 +24,11 @@ package com.sk89q.worldedit;
  * @author sk89q
  */
 public class Vector implements Comparable<Vector> {
-    public static Vector ZERO = new Vector(0, 0, 0);
-    public static Vector UNIT_X = new Vector(1, 0, 0);
-    public static Vector UNIT_Y = new Vector(0, 1, 0);
-    public static Vector UNIT_Z = new Vector(0, 0, 1);
-    public static Vector ONE = new Vector(1, 1, 1);
+    public static final Vector ZERO = new Vector(0, 0, 0);
+    public static final Vector UNIT_X = new Vector(1, 0, 0);
+    public static final Vector UNIT_Y = new Vector(0, 1, 0);
+    public static final Vector UNIT_Z = new Vector(0, 0, 1);
+    public static final Vector ONE = new Vector(1, 1, 1);
 
     protected final double x, y, z;
 

src/main/java/com/sk89q/worldedit/Vector2D.java

@@ -24,6 +24,11 @@ package com.sk89q.worldedit;
  * @author sk89q
  */
 public class Vector2D {
+    public static final Vector2D ZERO = new Vector2D(0, 0);
+    public static final Vector2D UNIT_X = new Vector2D(1, 0);
+    public static final Vector2D UNIT_Z = new Vector2D(0, 1);
+    public static final Vector2D ONE = new Vector2D(1, 1);
+
     protected final double x, z;
 
     /**