扩大陆地面积

src/OceanScene.js

@@ -280,11 +280,20 @@ export class OceanScene {
     
     async initTerrain() {
         const terrainGen = new TerrainGenerator({
-            size: 1200,
-            segments: 200,
-            maxHeight: 30,
-            waterLevel: 0,
-            seed: 42
+            size: 1200, // 地形平面尺寸
+            segments: 200, // 网格细分数，越高细节越多
+            maxHeight: 34, // 海面以上地形的最大起伏高度
+            waterLevel: 0, // 海平面基准高度
+            underwaterDepthBias: 4.5, // 整体压低海面以下地形，避免浅滩露出
+            landBias: 0.2, // 整体抬升陆地倾向，增大陆地露出面积
+            falloffStartRatio: 0.22, // 从中心向外开始下沉的起始比例
+            maxLandRatio: 0.46, // 大陆海岸线的大致外缘比例
+            edgeDepth: 12, // 海岸外侧向海底下沉的强度
+            coreRadiusRatio: 0.24, // 大陆核心高地区域半径比例
+            continentLift: 0.55, // 核心大陆的额外抬升强度
+            coastVariance: 0.05, // 海岸线形状起伏幅度，越大越不规则
+            outerShelfDepth: 4, // 大陆外侧陆架的额外下沉深度
+            seed: 42 // 固定随机种子，保证地形稳定复现
         });
         
         this.terrain = terrainGen.generate();

src/TerrainGenerator.js

@@ -10,6 +10,15 @@ export class TerrainGenerator {
         this.beachWidth = options.beachWidth || 20;
         this.shoreWidth = options.shoreWidth || 3.5;
         this.shoreDepth = options.shoreDepth || 1.5;
+        this.underwaterDepthBias = options.underwaterDepthBias || 3.5;
+        this.landBias = options.landBias ?? 0.18;
+        this.falloffStartRatio = options.falloffStartRatio || 0.24;
+        this.maxLandRatio = options.maxLandRatio || 0.48;
+        this.edgeDepth = options.edgeDepth || 10;
+        this.coreRadiusRatio = options.coreRadiusRatio || 0.2;
+        this.continentLift = options.continentLift || 0.35;
+        this.coastVariance = options.coastVariance || 0.08;
+        this.outerShelfDepth = options.outerShelfDepth || 2.5;
         
         this.noise = new SimplexNoise(options.seed || 42);
         this.terrain = null;
@@ -65,19 +74,44 @@ export class TerrainGenerator {
         height += detail;
         
         const distFromCenter = Math.sqrt(x * x + y * y);
-        const maxLandDist = this.size * 0.45;
-        const falloffStart = this.size * 0.2;
+        const angle = Math.atan2(y, x);
+        const coastNoise = this.noise.fbm(
+            Math.cos(angle) * 1.7 + 11.3,
+            Math.sin(angle) * 1.7 - 4.8,
+            3,
+            2.0,
+            0.5
+        );
+        const coastlineRadius = this.size * this.maxLandRatio * (1 + coastNoise * this.coastVariance);
+        const falloffStart = coastlineRadius * (this.falloffStartRatio / this.maxLandRatio);
+        const coreRadius = this.size * this.coreRadiusRatio;
+
+        let continentLift = 1.0;
+        if (distFromCenter < coreRadius) {
+            const t = distFromCenter / coreRadius;
+            continentLift += (1 - t * t) * this.continentLift;
+        }
         
         let continentMask = 1.0;
         let edgeDepth = 0;
         if (distFromCenter > falloffStart) {
-            const t = (distFromCenter - falloffStart) / (maxLandDist - falloffStart);
+            const t = (distFromCenter - falloffStart) / Math.max(0.0001, coastlineRadius - falloffStart);
             continentMask = Math.max(0, 1 - Math.pow(t, 1.2));
-            edgeDepth = -15 * Math.pow(Math.max(0, t), 2);
+            edgeDepth = -this.edgeDepth * Math.pow(Math.max(0, t), 2);
         }
         
-        height = height * continentMask + edgeDepth;
+        height = ((height * continentLift) + this.landBias) * continentMask + edgeDepth;
         height = height * this.maxHeight * 0.5;
+
+        if (distFromCenter > coastlineRadius) {
+            const t = THREE.MathUtils.clamp(
+                (distFromCenter - coastlineRadius) / (this.size * 0.08),
+                0,
+                1
+            );
+            const forcedSeaFloor = this.waterLevel - this.outerShelfDepth * Math.pow(t, 1.1);
+            height = Math.min(height, forcedSeaFloor);
+        }
         
         const shoreMin = this.waterLevel - this.shoreWidth;
         const shoreMax = this.waterLevel + this.shoreWidth;
@@ -91,6 +125,10 @@ export class TerrainGenerator {
             }
         }
 
+        if (height < this.waterLevel) {
+            height -= this.underwaterDepthBias;
+        }
+
         if (Math.abs(height - this.waterLevel) < 0.06) {
             height = this.waterLevel - 0.06;
         }