Index: binaries/data/mods/public/maps/random/rmgen/valueNoise2d.js
===================================================================
--- /dev/null
+++ binaries/data/mods/public/maps/random/rmgen/valueNoise2d.js
@@ -0,0 +1,42 @@
+/**
+ * @returns {Number} - Range [-1,1]
+ */
+function randomNoiseHashx(x, y) {
+    const v = Math.sin(x * 17.19 + y * 7238) * 3452;
+    return (v - Math.floor(v)) * 2 - 1;
+}
+
+/**
+ * @returns {Number} - Range [-1,1]
+ */
+function randomNoiseHashy(x, y) {
+    const v = Math.sin(x * 7.65 + y * 2345) * 5604;
+    return (v - Math.floor(v)) * 2 - 1;
+}
+
+/**
+ * Smooth uniform distributed noise using simple bilinear interpolation.
+ * @param {Number} x - x coordinate. 4 units equals to 1 map tile unit.
+ * @param {Number} y - y coordinate. 4 units equals to 1 map tile unit.
+ * @returns {Number} - Range [-1,1].
+ */
+function valueNoise2d(x, y) {
+
+    const ix = Math.floor(x);
+    const iy = Math.floor(y);
+
+    const v1 = randomNoiseHashx(ix, iy);
+    const v2 = randomNoiseHashx(ix + 1, iy);
+    const v3 = randomNoiseHashx(ix, iy + 1);
+    const v4 = randomNoiseHashx(ix + 1, iy + 1);
+
+    const ux = easeCurve(x - ix);
+    const uy = easeCurve(y - iy);
+
+    const mix = (x, y, a) => x * (1 - a) + y * a;
+    const mix12 = mix(v1, v2, ux);
+    const mix34 = mix(v3, v4, ux);
+    const mix1234 = mix(mix12, mix34, uy);
+
+    return mix1234;
+}