Javascript 三重阴影不透明度

嘿，我在画布上加载了一个自定义模型，一切都很好。我得到的唯一问题是，我没有胶水如何使阴影在模型本身上透明（模型应该投射和接收阴影）

我的代码如下所示：

var loader = new THREE.JSONLoader();
    loader.load('model/p3.json', handle_load);

    var mesh;
    function handle_load(geometry, materials) {

        var material = new THREE.MeshPhongMaterial();

        mesh = new THREE.Mesh(geometry,material);

        scene.add(mesh);
        mesh.position.z = 0;
        mesh.position.y = 0;
        mesh.rotation.y = 5;


        //LIGHT
        var ambient = new THREE.AmbientLight(0xffffff, 0.15);
        ambient.target = mesh;

        scene.add(ambient);

        var light = new THREE.DirectionalLight(0xffffff, 1);
        light.target = mesh;
        light.castShadow = true;
        light.position.z = -150;
        light.position.y = 150;
        light.position.x = 150;
        light.shadow.bias = 0;
        light.shadowDarkness = 0.2;
        light.shadow.mapSize.width = 2048 * 2;
        light.shadow.mapSize.height = 2048 * 2;
        scene.add(light);
        mesh.receiveShadow = true;
        mesh.castShadow = true;

    }

    var shadowmaterial = new THREE.ShadowMaterial();
    shadowmaterial.opacity = 0.2;


    var material2 = new THREE.MeshPhongMaterial({
        color: 0xffffff,
    });

    var geometry3 = new THREE.PlaneGeometry(500, 500, 100, 100);
    var mesh3 = new THREE.Mesh(geometry3, shadowmaterial);
    mesh3.rotation.x = -90 * Math.PI / 180;
    mesh3.position.y = 0;
    scene.add(mesh3);

     mesh3.receiveShadow = true;

渲染如下所示：

var loader = new THREE.JSONLoader();
    loader.load('model/p3.json', handle_load);

    var mesh;
    function handle_load(geometry, materials) {

        var material = new THREE.MeshPhongMaterial();

        mesh = new THREE.Mesh(geometry,material);

        scene.add(mesh);
        mesh.position.z = 0;
        mesh.position.y = 0;
        mesh.rotation.y = 5;


        //LIGHT
        var ambient = new THREE.AmbientLight(0xffffff, 0.15);
        ambient.target = mesh;

        scene.add(ambient);

        var light = new THREE.DirectionalLight(0xffffff, 1);
        light.target = mesh;
        light.castShadow = true;
        light.position.z = -150;
        light.position.y = 150;
        light.position.x = 150;
        light.shadow.bias = 0;
        light.shadowDarkness = 0.2;
        light.shadow.mapSize.width = 2048 * 2;
        light.shadow.mapSize.height = 2048 * 2;
        scene.add(light);
        mesh.receiveShadow = true;
        mesh.castShadow = true;

    }

    var shadowmaterial = new THREE.ShadowMaterial();
    shadowmaterial.opacity = 0.2;


    var material2 = new THREE.MeshPhongMaterial({
        color: 0xffffff,
    });

    var geometry3 = new THREE.PlaneGeometry(500, 500, 100, 100);
    var mesh3 = new THREE.Mesh(geometry3, shadowmaterial);
    mesh3.rotation.x = -90 * Math.PI / 180;
    mesh3.position.y = 0;
    scene.add(mesh3);

     mesh3.receiveShadow = true;

---

非常感谢您的帮助

因为您的网格材质始终为灰色，地板为白色，阴影中始终会有对比。从我的发现来看，阴影旨在将这种物理真实感嵌入其中，不允许通过调整材质和灯光来直接调整阴影属性

可以将平面材质颜色降为灰色而不是白色，并提高灯光强度。或者使你的网布材质变亮，降低光照强度

您还可以添加更多灯光并进行调整。增加环境光和减少方向光应该会降低阴影对比度。其他类型的灯光也会产生效果

---

您还可以播放材质的不同方面，使其变得更白、更暗，从而影响阴影效果。反射率就是一个例子。所以，若你们降低了方向，但想要它仍然和方向发生反应，你们可以使用反射率和镜面反射

此示例可能会有所帮助：@Radio谢谢您的提示！你能解释一下这会有什么帮助吗？