Reflection 三个js镜像不反射所有网格

目标：

• 以三种方式模拟反射地板（）

想法：

• 通过将“不透明度”设置为0.5，使地板半透明
• 在其下方放置一面镜子以反射其上方的网格

预期产出：

.......
.......
function getReflectiveFloorMesh(floorMesh) {

        var WIDTH = window.innerWidth;
        var HEIGHT = window.innerHeight;

        floorMirror = new THREE.Mirror( renderer, firstPerson.camera,
                    { clipBias: 0.003,
                    textureWidth: WIDTH,
                    textureHeight: HEIGHT,
                    color: 0x889999 } );

        var mirrorMesh = floorMesh.clone();

        mirrorMesh.position.y -= 10;            // Placing the mirror just below the actual translucent floor; Fixme: To be tuned
        mirrorMesh.material = floorMirror.material;

        mirrorMesh.material.side = THREE.BackSide;  // Fixme: Normals were flipped. How to decide on normals?
        mirrorMesh.material.needsUpdate = true;

        mirrorMesh.add(floorMirror);

        return mirrorMesh;

    }

    function getSkybox() {
        var urlPrefix = "/img/skybox/sunset/";
        var urls = [urlPrefix + "px.png", urlPrefix + "nx.png",
            urlPrefix + "py.png", urlPrefix + "ny.png",
            urlPrefix + "pz.png", urlPrefix + "nz.png"];
        var textureCube = THREE.ImageUtils.loadTextureCube(urls);

        // init the cube shadder
        var shader = THREE.ShaderLib["cube"];
        shader.uniforms["tCube"].value = textureCube;
        var material = new THREE.ShaderMaterial({
            fragmentShader: shader.fragmentShader,
            vertexShader: shader.vertexShader,
            uniforms: shader.uniforms,
            side: THREE.BackSide
        });

        // build the skybox Mesh
        var skyboxMesh = new THREE.Mesh(new THREE.CubeGeometry(10000, 10000, 10000, 1, 1, 1, null, true), material);

        return skyboxMesh;
    }

    function setupScene(model, floor) {
        scene.add(model); // Adding the house which contains translucent floor
        scene.add(getSkybox()); // Adding Skybox
        scene.add(getReflectiveFloorMesh(floor)); // Adds mirror just below floor

        scope.animate();
    }
....
....
this.animate = function () {

    // Render the mirrors
    if(floorMirror)
        floorMirror.render();

    renderer.render(scene, firstPerson.camera);
};

• 能够通过落地镜看到房子的倒影

获得的输出：

.......
.......
function getReflectiveFloorMesh(floorMesh) {

        var WIDTH = window.innerWidth;
        var HEIGHT = window.innerHeight;

        floorMirror = new THREE.Mirror( renderer, firstPerson.camera,
                    { clipBias: 0.003,
                    textureWidth: WIDTH,
                    textureHeight: HEIGHT,
                    color: 0x889999 } );

        var mirrorMesh = floorMesh.clone();

        mirrorMesh.position.y -= 10;            // Placing the mirror just below the actual translucent floor; Fixme: To be tuned
        mirrorMesh.material = floorMirror.material;

        mirrorMesh.material.side = THREE.BackSide;  // Fixme: Normals were flipped. How to decide on normals?
        mirrorMesh.material.needsUpdate = true;

        mirrorMesh.add(floorMirror);

        return mirrorMesh;

    }

    function getSkybox() {
        var urlPrefix = "/img/skybox/sunset/";
        var urls = [urlPrefix + "px.png", urlPrefix + "nx.png",
            urlPrefix + "py.png", urlPrefix + "ny.png",
            urlPrefix + "pz.png", urlPrefix + "nz.png"];
        var textureCube = THREE.ImageUtils.loadTextureCube(urls);

        // init the cube shadder
        var shader = THREE.ShaderLib["cube"];
        shader.uniforms["tCube"].value = textureCube;
        var material = new THREE.ShaderMaterial({
            fragmentShader: shader.fragmentShader,
            vertexShader: shader.vertexShader,
            uniforms: shader.uniforms,
            side: THREE.BackSide
        });

        // build the skybox Mesh
        var skyboxMesh = new THREE.Mesh(new THREE.CubeGeometry(10000, 10000, 10000, 1, 1, 1, null, true), material);

        return skyboxMesh;
    }

    function setupScene(model, floor) {
        scene.add(model); // Adding the house which contains translucent floor
        scene.add(getSkybox()); // Adding Skybox
        scene.add(getReflectiveFloorMesh(floor)); // Adds mirror just below floor

        scope.animate();
    }
....
....
this.animate = function () {

    // Render the mirrors
    if(floorMirror)
        floorMirror.render();

    renderer.render(scene, firstPerson.camera);
};

• 不反射作为房屋一部分的网格
• 相反，它只反射天空盒，而且也只在某些角度反射天空盒

截图：

• 完全反射天空盒的镜子-
• 镜面反射天空盒部分-
• 镜子不反射任何东西-

问题：

.......
.......
function getReflectiveFloorMesh(floorMesh) {

        var WIDTH = window.innerWidth;
        var HEIGHT = window.innerHeight;

        floorMirror = new THREE.Mirror( renderer, firstPerson.camera,
                    { clipBias: 0.003,
                    textureWidth: WIDTH,
                    textureHeight: HEIGHT,
                    color: 0x889999 } );

        var mirrorMesh = floorMesh.clone();

        mirrorMesh.position.y -= 10;            // Placing the mirror just below the actual translucent floor; Fixme: To be tuned
        mirrorMesh.material = floorMirror.material;

        mirrorMesh.material.side = THREE.BackSide;  // Fixme: Normals were flipped. How to decide on normals?
        mirrorMesh.material.needsUpdate = true;

        mirrorMesh.add(floorMirror);

        return mirrorMesh;

    }

    function getSkybox() {
        var urlPrefix = "/img/skybox/sunset/";
        var urls = [urlPrefix + "px.png", urlPrefix + "nx.png",
            urlPrefix + "py.png", urlPrefix + "ny.png",
            urlPrefix + "pz.png", urlPrefix + "nz.png"];
        var textureCube = THREE.ImageUtils.loadTextureCube(urls);

        // init the cube shadder
        var shader = THREE.ShaderLib["cube"];
        shader.uniforms["tCube"].value = textureCube;
        var material = new THREE.ShaderMaterial({
            fragmentShader: shader.fragmentShader,
            vertexShader: shader.vertexShader,
            uniforms: shader.uniforms,
            side: THREE.BackSide
        });

        // build the skybox Mesh
        var skyboxMesh = new THREE.Mesh(new THREE.CubeGeometry(10000, 10000, 10000, 1, 1, 1, null, true), material);

        return skyboxMesh;
    }

    function setupScene(model, floor) {
        scene.add(model); // Adding the house which contains translucent floor
        scene.add(getSkybox()); // Adding Skybox
        scene.add(getReflectiveFloorMesh(floor)); // Adds mirror just below floor

        scope.animate();
    }
....
....
this.animate = function () {

    // Render the mirrors
    if(floorMirror)
        floorMirror.render();

    renderer.render(scene, firstPerson.camera);
};

• 为什么房子的其他网格没有通过镜子反射出来
• 为什么镜子不能在相机的特定方向上反射

所附代码：

.......
.......
function getReflectiveFloorMesh(floorMesh) {

        var WIDTH = window.innerWidth;
        var HEIGHT = window.innerHeight;

        floorMirror = new THREE.Mirror( renderer, firstPerson.camera,
                    { clipBias: 0.003,
                    textureWidth: WIDTH,
                    textureHeight: HEIGHT,
                    color: 0x889999 } );

        var mirrorMesh = floorMesh.clone();

        mirrorMesh.position.y -= 10;            // Placing the mirror just below the actual translucent floor; Fixme: To be tuned
        mirrorMesh.material = floorMirror.material;

        mirrorMesh.material.side = THREE.BackSide;  // Fixme: Normals were flipped. How to decide on normals?
        mirrorMesh.material.needsUpdate = true;

        mirrorMesh.add(floorMirror);

        return mirrorMesh;

    }

    function getSkybox() {
        var urlPrefix = "/img/skybox/sunset/";
        var urls = [urlPrefix + "px.png", urlPrefix + "nx.png",
            urlPrefix + "py.png", urlPrefix + "ny.png",
            urlPrefix + "pz.png", urlPrefix + "nz.png"];
        var textureCube = THREE.ImageUtils.loadTextureCube(urls);

        // init the cube shadder
        var shader = THREE.ShaderLib["cube"];
        shader.uniforms["tCube"].value = textureCube;
        var material = new THREE.ShaderMaterial({
            fragmentShader: shader.fragmentShader,
            vertexShader: shader.vertexShader,
            uniforms: shader.uniforms,
            side: THREE.BackSide
        });

        // build the skybox Mesh
        var skyboxMesh = new THREE.Mesh(new THREE.CubeGeometry(10000, 10000, 10000, 1, 1, 1, null, true), material);

        return skyboxMesh;
    }

    function setupScene(model, floor) {
        scene.add(model); // Adding the house which contains translucent floor
        scene.add(getSkybox()); // Adding Skybox
        scene.add(getReflectiveFloorMesh(floor)); // Adds mirror just below floor

        scope.animate();
    }
....
....
this.animate = function () {

    // Render the mirrors
    if(floorMirror)
        floorMirror.render();

    renderer.render(scene, firstPerson.camera);
};

想法：

“通过将“不透明度”设置为0.5，使地板半透明。 在其下方放置一面镜子，以反射其上方的网格”

我建议另一种方法，将地板做成实心，在顶部添加镜子，并更改镜子的alpha，我认为半透明地板会限制镜子通过alpha的投影

如果将镜子从半透明地板下移动到空场景中，或将其移动到仅附加了立方体或球体几何体的基本材质中，它是否会按预期反射

---

您可能需要两个镜子，一个用于房间，假设您需要抛光地板，另一个用于外部全反射

在进行任何变换之前，您必须将镜子连接到网格。 因此，代码应该是：

floorMirror = new THREE.Mirror( ... );

var mirrorMesh = floorMesh.clone();

    mirrorMesh.add(floorMirror); // attach first!
    mirrorMesh.position.y -= 10; 
    ...

但这里的另一个问题是，您正在从

floorMesh

克隆

mirrorMesh

，该克隆已经（可能）转换

创建时，镜像对象具有与具有平面几何体的规则网格相同的默认变换矩阵（默认情况下为“垂直”）

将镜子附着到地板（或任何水平网格）时，矩阵与网格不匹配，因此无法看到反射，或者只能从某个角度看到反射

---

因此，在应用变换（平移或旋转）之前，请始终将镜像连接到未变换的平面网格。

clipBias:0.003将其更改为更大的？mirrorMesh.rotation.x=-Math.PI/2；//或者x，yYes。修改clipBias会影响输出，而不仅仅是反映skybox。它模糊地反射其他网格。我想需要调整clipBias。但它仍然不能解释为什么镜子在某些角度上不显示反射，如果你有一个链接，我可以看看，我在线一段时间的mirrormesh.position.y-=10；如果将此高度提高，它是否正确反射？例如：mirrorMesh.position.y=15如果将镜子从半透明地板下移到空场景中，或移到仅附加了立方体或球体几何体的基本材质中，它是否按预期反射？-不。反射输出随摄像机方向的变化而变化。此特定示例是一个简化版本的镜像和顶部球体（如果有）。此外，“镜像”对象支持在材质中使用着色器，因此您可以编写自己的着色器并将地板纹理与反射纹理混合，如本示例所示：。这样就不需要使用两个网格进行“欺骗”。