Three.js 使用网格Lambert材质时，灯光效果看起来很奇怪

我在将Mesh Lambert Material与Three.js一起使用时遇到问题，我有一个具有不同高度点的平面，但是当尝试应用灯光时，较高的点看起来更暗，应该是相反的，我的代码如下所示：

var geometry = new THREE.PlaneBufferGeometry(7500, 7500, worldWidth - 1, worldDepth -1);
geometry.computeFaceNormals();
geometry.applyMatrix(new THREE.Matrix4().makeRotationX(- Math.PI / 2));

texture = THREE.ImageUtils.loadTexture('img/grass.png');
mesh = new THREE.Mesh(geometry, new THREE.MeshLambertMaterial({ map: texture }));
scene.add(mesh);

var pointLight = new THREE.PointLight(0xffffff, 100, 0);
pointLight.position.set(5, 50, 5);
scene.add(pointLight);

结果如下所示：

var geometry = new THREE.PlaneBufferGeometry(7500, 7500, worldWidth - 1, worldDepth -1);
geometry.computeFaceNormals();
geometry.applyMatrix(new THREE.Matrix4().makeRotationX(- Math.PI / 2));

texture = THREE.ImageUtils.loadTexture('img/grass.png');
mesh = new THREE.Mesh(geometry, new THREE.MeshLambertMaterial({ map: texture }));
scene.add(mesh);

var pointLight = new THREE.PointLight(0xffffff, 100, 0);
pointLight.position.set(5, 50, 5);
scene.add(pointLight);

提前非常感谢。

在您给

THREE.PointLight(0xffffff, 100, 0);

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当“法线范围”为0.0-1.0时，将“强度”指定为100，这样场景就会过亮

你试过改变灯光的位置吗？我已经试过降低亮度，但是场景完全变暗了。你确定灯光不在表面的另一侧吗？