ShaderMaterial中的淡出颜色

// 顶点着色器
const vertexShader = `
    varying vec2 vUv;
    void main() {
        vUv = uv;
        gl_Position = projectionMatrix * modelViewMatrix * vec4(position, 1.0);
    }
`;

// 片元着色器
const fragmentShader = `
    uniform vec3 fadeColor;
    varying vec2 vUv;
    void main() {
        // 根据淡出颜色计算最终的颜色
        vec4 finalColor = vec4(fadeColor, 1.0);
        gl_FragColor = finalColor;
    }
`;

// 创建ShaderMaterial
const fadeMaterial = new THREE.ShaderMaterial({
    uniforms: {
        fadeColor: { value: new THREE.Vector3(1, 0, 0) }, // 设置淡出颜色为红色
    },
    vertexShader: vertexShader,
    fragmentShader: fragmentShader,
});

// 应用ShaderMaterial到物体上
const mesh = new THREE.Mesh(geometry, fadeMaterial);
scene.add(mesh);