Correct rounding bevhaviour for Vector3 -> BlockVector3

- fixes #512

worldedit-core/src/main/java/com/boydti/fawe/object/brush/SplineBrush.java

@@ -4,6 +4,7 @@ import com.boydti.fawe.FaweCache;
 import com.boydti.fawe.object.brush.visualization.VisualExtent;
 import com.boydti.fawe.object.mask.IdMask;
 import com.boydti.fawe.object.visitor.DFSRecursiveVisitor;
+import com.boydti.fawe.util.MathMan;
 import com.sk89q.worldedit.EditSession;
 import com.sk89q.worldedit.WorldEditException;
 import com.sk89q.worldedit.command.tool.brush.Brush;
@@ -13,6 +14,7 @@ import com.sk89q.worldedit.function.mask.MaskIntersection;
 import com.sk89q.worldedit.function.operation.Operations;
 import com.sk89q.worldedit.function.pattern.Pattern;
 import com.sk89q.worldedit.math.BlockVector3;
+import com.sk89q.worldedit.math.MathUtils;
 import com.sk89q.worldedit.math.MutableVector3;
 import com.sk89q.worldedit.math.Vector3;
 import com.sk89q.worldedit.math.interpolation.Node;
@@ -195,15 +197,15 @@ public class SplineBrush implements Brush, ResettableTool {
         if (det_max == det_x) {
             double a = (xz * yz - xy * zz) / det_x;
             double b = (xy * yz - xz * yy) / det_x;
-            dir = BlockVector3.at(1.0, a, b);
+            dir = BlockVector3.at(1.0, (int) MathUtils.roundHalfUp(a), (int) MathUtils.roundHalfUp(b));
         } else if (det_max == det_y) {
             double a = (yz * xz - xy * zz) / det_y;
             double b = (xy * xz - yz * xx) / det_y;
-            dir = BlockVector3.at(a, 1.0, b);
+            dir = BlockVector3.at((int) MathUtils.roundHalfUp(a), 1.0, (int) MathUtils.roundHalfUp(b));
         } else {
             double a = (yz * xy - xz * yy) / det_z;
             double b = (xz * xy - yz * xx) / det_z;
-            dir = BlockVector3.at(a, b, 1.0);
+            dir = BlockVector3.at((int) MathUtils.roundHalfUp(a), (int) MathUtils.roundHalfUp(b), 1.0);
         }
         return dir.normalize();
     }

worldedit-core/src/main/java/com/sk89q/worldedit/math/Vector3.java

@@ -84,15 +84,15 @@ public abstract class Vector3 {
     }
 
     public int getBlockX() {
-        return MathMan.roundInt(getX());
+        return (int) MathUtils.roundHalfUp(getX());
     }
 
     public int getBlockY() {
-        return MathMan.roundInt(getY());
+        return (int) MathUtils.roundHalfUp(getY());
     }
 
     public int getBlockZ() {
-        return MathMan.roundInt(getZ());
+        return (int) MathUtils.roundHalfUp(getZ());
     }
 
     public MutableVector3 setComponents(Vector3 other) {
@@ -595,7 +595,8 @@ public abstract class Vector3 {
      * @return a new {@code BlockVector}
      */
     public static BlockVector3 toBlockPoint(double x, double y, double z) {
-        return BlockVector3.at(x, y, z);
+        return BlockVector3.at(MathUtils.roundHalfUp(x), MathUtils.roundHalfUp(y), MathUtils.roundHalfUp(z));
+        //return BlockVector3.at(x, y, z);
     }
 
     /**

worldedit-core/src/main/java/com/sk89q/worldedit/util/Direction.java

@@ -19,6 +19,7 @@
 
 package com.sk89q.worldedit.util;
 
+import com.boydti.fawe.util.MathMan;
 import com.sk89q.worldedit.math.BlockVector3;
 import com.sk89q.worldedit.math.Vector3;
 
@@ -79,7 +80,8 @@ public enum Direction {
     }
 
     Direction(Vector3 vector, int flags, int left, int right) {
-        this.blockPoint = BlockVector3.at(Math.signum(vector.getX()), Math.signum(vector.getY()), Math.signum(vector.getZ()));
+        this.blockPoint = BlockVector3.at(MathMan.roundInt(Math.signum(vector.getX())),
+            MathMan.roundInt(Math.signum(vector.getY())), MathMan.roundInt(Math.signum(vector.getZ())));
         this.direction = vector.normalize();
         this.flags = flags;
         this.left = left;