Index: binaries/data/mods/public/maps/random/rmgen/painter/DunePainter.js
===================================================================
--- /dev/null
+++ binaries/data/mods/public/maps/random/rmgen/painter/DunePainter.js
@@ -0,0 +1,64 @@
+/**
+ * @param {Boolean} type - ELEVATION_MODIFY or ELEVATION_SET.
+ * @param {Number} scale - Global scale of dune size.
+ * @param {Number} scaleVertical - Vertical scale of dune size.
+ * @param {Number} baseHeight - Dunes base altitude if type=ELEVATION_SET.
+ */
+class DunePainter
+{
+    constructor(type = ELEVATION_MODIFY, scale = 1, scaleVertical = 1, baseHeight = 0)
+    {
+        this.type = type;
+        this.scale = scale;
+        this.scaleVertical = scaleVertical;
+        this.baseHeight = baseHeight;
+    }
+
+    /**
+     * Dune shape function.
+     * @param {Number} x - [0,1] value.
+     * @param {Number} xCrest - (0,1) position of the dune crest.
+     * @param {Boolean} dune - True is dune, false is dome.
+     * @returns {Number} Height of dune at point x
+     */
+    dune(x, xCrest = 0.75, dune = true)
+    {
+        return x < xCrest ? (1 - Math.cos(Math.PI * x / xCrest)) * 0.5 :
+            dune ? (1 - Math.cos(Math.PI * (x - 1) / (xCrest - 1))) * 0.5 :
+                1 - Math.cos(Math.PI * (x - 1) / (xCrest - 1) * 0.5);
+    }
+
+    paint(area)
+    {
+        let points = area.getPoints();
+
+        // 1st dune layer.
+        let height1_1 = PerlinNoise(points, 6, 2, 1, 1.1, true);
+        let height1_2 = PerlinNoise(points, 3, 2, 1, 1, true);
+        // Make big dunes 17 times wider than taller.
+        let width1 = 17.0 * this.scale;
+
+        // 2nd dune layer.
+        let height2_1 = PerlinNoise(points, 8, 1, 2, 2, true);
+        let height2_2 = PerlinNoise(points, 4, 2, 2, 2, true);
+        // Make smaller dunes 14 times wider than taller.
+        let width2 = 14.0 * this.scale;
+
+        for (let i = 0; i < points.length; ++i)
+        {
+            let x1 = ((points[i].x + height1_1[i] * 13 + points[i].y * 0.1) % width1) / width1;
+            // Main dunes creation height.
+            let height1 = this.dune(x1, 0.60, false) * 9 * 0.9 + height1_1[i] * height1_2[i] * 150 * 0.1;
+
+            let x2 = ((points[i].x + height2_1[i] * 13 + points[i].y * 0.1) % width2) / width2;
+            // Secondary dunes height.
+            let height2 = this.dune(x2, 0.60, false) * 9 * 0.9 + height2_2[i] * 50 * 0.1;
+
+            let height = (height1 * 0.8 + height2 * 0.2) * this.scaleVertical * this.scale;
+
+            // Add or set height.
+            let base = this.type ? g_Map.getHeight(points[i]) : baseHeight;
+            g_Map.setHeight(points[i], base + height);
+        }
+    }
+}