Fix: add init() method to Landscape class

assets/index.html

@@ -70,6 +70,16 @@
                 this.init();
             }
 
+            init() {
+                const spacing = 40;
+                for (let x = -200; x <= 200; x += spacing) {
+                    for (let z = -200; z <= 200; z += spacing) {
+                        const y = Math.sin(x / 30) * 20 + Math.cos(z / 30) * 20 + Math.random() * 10;
+                        this.points.set(`${x},${z}`, new Point3D(x, y, z));
+                    }
+                }
+            }
+
             getKey(x, z) {
                 return `${Math.round(x / this.gridSize)},${Math.round(z / this.gridSize)}`;
             }