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 +1,71 @@
+/**
+ * @param {Boolean} type - ELEVATION_MODIFY or ELEVATION_SET.
+ * @param {Number} scale - Global scale of dune size. > 1 bigger, < 1 smaller.
+ * @param {Number} scaleVertical - Vertical scale of dune size. > 1 taller, < 1 smaller.
+ * @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 profile shape primitive.
+     * @param {Number} x - [0,1] value.
+     * @param {Number} xCrest - (0,1) position of the dune crest relative to the dune width.
+     * @param {Boolean} dune - True is dune, false is dome.
+     * @returns {Number} [0,1] - Height of the dune at point x
+     */
+	duneProfile(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) {
+
+		// Dunes width.
+		let width = 20.0 * this.scale;
+		let mod = (val, period) => val % period < 0 ? period + val % period : val % period;
+
+		for (let p of area.getPoints()) {
+
+			let x = p.x;
+			let y = p.y;
+
+			// Main dunes creation height.
+			let height1;
+			{
+				let xProfile = x +
+					this.scale * 20 * valueNoise2d(x / (3 * width), y / (3 * width)) +
+					this.scale * 5 * valueNoise2d(x / width, y / width);
+				xProfile = mod(xProfile / width, 1);
+				let duneLongintudinalScale = valueNoise2d(x / (3 * width), y / (3 * width)) * 0.5 + 0.5;
+				height1 = this.duneProfile(xProfile, 0.70, false) * duneLongintudinalScale;
+			}
+
+			// Secondary dunes creation height.
+			let height2;
+			{
+				// Rotate slightly
+				let rx = Math.cos(3.14 / 20);
+				let ry = Math.sin(3.14 / 20);
+				[x, y] = [x * rx - y * ry, x * ry + y * rx];
+
+				let xProfile = x +
+					this.scale * 20 * valueNoise2d(x / (3 * width), y / (3 * width)) +
+					this.scale * 5 * valueNoise2d(x / width, y / width);
+				xProfile = mod(xProfile / width, 1);
+				height2 = this.duneProfile(xProfile, 0.60, false);
+			}
+
+			let height = (height1 * 0.8 + height2 * 0.2) * 12 * this.scale * this.scaleVertical;
+			// Add or set height.
+			let base = this.type == ELEVATION_MODIFY ? g_Map.getHeight(p) : baseHeight;
+			g_Map.setHeight(p, base + height);
+		}
+	}
+}