Implement more noise patterns

worldedit-core/src/main/java/com/sk89q/worldedit/math/noise/SimplexNoiseGenerator.java

@@ -0,0 +1,23 @@
+package com.sk89q.worldedit.math.noise;
+
+import com.boydti.fawe.object.random.SimplexNoise;
+import com.sk89q.worldedit.math.Vector2;
+import com.sk89q.worldedit.math.Vector3;
+
+public class SimplexNoiseGenerator implements NoiseGenerator {
+
+    @Override
+    public float noise(Vector2 position) {
+        return convert(SimplexNoise.noise(position.getX(), position.getZ()));
+    }
+
+    @Override
+    public float noise(Vector3 position) {
+        return convert(SimplexNoise.noise(position.getX(), position.getY(), position.getZ()));
+    }
+
+    private float convert(double d) {
+        // we need to go from [-1, 1] to [0, 1] and from double to float
+        return (float) ((d + 1) * 0.5);
+    }
+}