如何创建自定义THREE.MeshStandardMaterial？

Question

我正在寻找创建一个与MeshStandardMaterial相同的three.js的材质。 我想这样做是因为我需要它的所有功能，除了对GLSL代码进行少量更改。

我尝试使用ShaderMaterial重新创建MeshStandardMaterial。

WAFFLE.StandardMaterial = function( parameters ) {

parameters.uniforms = THREE.UniformsUtils.merge( [
    THREE.UniformsLib.common,
    THREE.UniformsLib.aomap,
    THREE.UniformsLib.lightmap,
    THREE.UniformsLib.emissivemap,
    THREE.UniformsLib.bumpmap,
    THREE.UniformsLib.normalmap,
    THREE.UniformsLib.displacementmap,
    THREE.UniformsLib.roughnessmap,
    THREE.UniformsLib.metalnessmap,
    THREE.UniformsLib.fog,
    THREE.UniformsLib.lights,
    {
        emissive: { value: new THREE.Color( 0x000000 ) },
        roughness: { value: 0.5 },
        metalness: { value: 0 },
        envMapIntensity: { value: 1 } // temporary
    }
] );

parameters.vertexShader = THREE.ShaderChunk.meshphysical_vert;
parameters.fragmentShader = THREE.ShaderChunk.meshphysical_frag;

THREE.ShaderMaterial.call( this, parameters );

}

WAFFLE.StandardMaterial.prototype = Object.create( THREE.ShaderMaterial.prototype );
WAFFLE.StandardMaterial.prototype.constructor = WAFFLE.StandardMaterial;

到目前为止，我还没有成功。

如何重新创建MeshStandardMaterial？