创建一个高斯模糊着色器效果，使用双通道（横向和纵向）分离模糊，结合纹理采样实现高质量后处理模糊效果。

const cubeShader = {
    uniforms: {
        tDiffuse: {
            type: 't',
            value: new THREE.TextureLoader().load(FILE_HOST + 'threeExamples/shader/dlam.jpg')
        },
        vScreenSize: {
            type: "v2",
            value: new THREE.Vector2(window.innerWidth, window.innerHeight)
        },
        fScale: {
            type: "float",
            value: 10
        },
    },
    vertexShader: `
        varying vec2 vUv;
        void main(){
            vUv = uv;
            gl_Position = projectionMatrix * modelViewMatrix * vec4(position, 1.0);
        }
    `,
    fragmentShader: `
        varying vec2 vUv;
        uniform sampler2D tDiffuse;
        uniform vec2 vScreenSize;
        uniform float fScale;
        // ... 模糊逻辑
    `
}

varying vec2 vUv;
uniform sampler2D tDiffuse;
uniform vec2 vScreenSize;
uniform float fScale;

void main() {
    vec4 sum = vec4(0.0);
    float h = fScale/vScreenSize.x;
    float v = fScale/vScreenSize.y;

    // 纵向高斯模糊
    sum += texture2D(tDiffuse, vec2(vUv.x, vUv.y - 4.0 * v)) * (0.051/2.0);
    sum += texture2D(tDiffuse, vec2(vUv.x, vUv.y - 3.0 * v)) * (0.0918/2.0);
    sum += texture2D(tDiffuse, vec2(vUv.x, vUv.y - 2.0 * v)) * (0.12245/2.0);
    sum += texture2D(tDiffuse, vec2(vUv.x, vUv.y - 1.0 * v)) * (0.1531/2.0);
    sum += texture2D(tDiffuse, vec2(vUv.x, vUv.y)) * (0.1633/2.0);
    sum += texture2D(tDiffuse, vec2(vUv.x, vUv.y + 1.0 * v)) * (0.1531/2.0);
    sum += texture2D(tDiffuse, vec2(vUv.x, vUv.y + 2.0 * v)) * (0.12245/2.0);
    sum += texture2D(tDiffuse, vec2(vUv.x, vUv.y + 3.0 * v)) * (0.0918/2.0);
    sum += texture2D(tDiffuse, vec2(vUv.x, vUv.y + 4.0 * v)) * (0.051/2.0);

    // 横向高斯模糊
    sum += texture2D(tDiffuse, vec2(vUv.x - 4.0 * h, vUv.y)) * (0.051/2.0);
    sum += texture2D(tDiffuse, vec2(vUv.x - 3.0 * h, vUv.y)) * (0.0918/2.0);
    sum += texture2D(tDiffuse, vec2(vUv.x - 2.0 * h, vUv.y)) * (0.12245/2.0);
    sum += texture2D(tDiffuse, vec2(vUv.x - 1.0 * h, vUv.y)) * (0.1531/2.0);
    sum += texture2D(tDiffuse, vec2(vUv.x, vUv.y)) * (0.1633/2.0);
    sum += texture2D(tDiffuse, vec2(vUv.x + 1.0 * h, vUv.y)) * (0.1531/2.0);
    sum += texture2D(tDiffuse, vec2(vUv.x + 2.0 * h, vUv.y)) * (0.12245/2.0);
    sum += texture2D(tDiffuse, vec2(vUv.x + 3.0 * h, vUv.y)) * (0.0918/2.0);
    sum += texture2D(tDiffuse, vec2(vUv.x + 4.0 * h, vUv.y)) * (0.051/2.0);

    gl_FragColor = sum;
}

权重分布（9采样点）：
中心点: 0.1633
±1点:   0.1531
±2点:   0.12245
±3点:   0.0918
±4点:   0.051

总和: 0.051 + 0.0918 + 0.12245 + 0.1531 + 0.1633 + 0.1531 + 0.12245 + 0.0918 + 0.051 = 1.0

cubeMaterial = new THREE.ShaderMaterial({
    uniforms: cubeShader.uniforms,
    vertexShader: cubeShader.vertexShader,
    fragmentShader: cubeShader.fragmentShader,
    side: THREE.DoubleSide
});