[LayaAir 2.0]继承自Laya.BaseMaterial并且自定义Shader的的自定义材质如何设置透明渲染

export default class CMat extends Laya.BaseMaterial {   





    public static _mainTex : number;

    public static _mainCol : number;

    inited : boolean = false;



    constructor() {

        super();      

        if(!this.inited)

        {

            CMat._mainTex = Laya.Shader3D.propertyNameToID("u_MainTex");

            CMat._mainCol = Laya.Shader3D.propertyNameToID("u_MainCol");

            CMat.initShader();

            

            this.inited = true;

        }    

        this.setShaderName("CMatShader");

    }



    public SetMainTex(value)

    {

        this._shaderValues.setTexture(CMat._mainTex, value);

    }



    public SetMainCol(value)

    {

        this._shaderValues.setVector3(CMat._mainCol, value);

    }

        /**

     * 设置渲染相关状态。

     */





    private static initShader(): void {

        var attributeMap:Object = {

            'a_Position': Laya.VertexMesh.MESH_POSITION0, 

            'a_Normal': Laya.VertexMesh.MESH_NORMAL0,

            'a_Texcood0': Laya.VertexMesh.MESH_TEXTURECOORDINATE0

        };

        var uniformMap:Object = {

            'u_MvpMatrix': Laya.Shader3D.PERIOD_SPRITE, 

            'u_WorldMat': Laya.Shader3D.PERIOD_SPRITE,

            'u_MainTex': Laya.Shader3D.PERIOD_MATERIAL,

            'u_MainCol': Laya.Shader3D.PERIOD_MATERIAL

        };

        var vs:string = `

        #include "Lighting.glsl"; 

        attribute vec4 a_Position;

        attribute vec3 a_Normal;

        attribute vec2 a_Texcood0;



        uniform mat4 u_MvpMatrix;

        uniform mat4 u_WorldMat;



        varying vec3 v_Normal;

        varying vec2 uv;

        varying vec4 worldPos;



        void main()

        {

            gl_Position = u_MvpMatrix * a_Position;

            mat3 worldMat = mat3(u_WorldMat);

            v_Normal = worldMat * a_Normal;

            worldPos = u_WorldMat * a_Position;

            uv = a_Texcood0;

            gl_Position = remapGLPositionZ(gl_Position); 

        }`;

        var ps:string = `

        #ifdef FSHIGHPRECISION

        precision highp float;

        #else

        precision mediump float;

        #endif



        uniform sampler2D u_MainTex;

        uniform vec3 u_MainCol;



        varying vec3 v_Normal;

        varying vec2 uv;

        varying vec4 worldPos;



        void main()

        {

            vec4 col = texture2D(u_MainTex, uv);

            //gl_FragColor = vec4(worldPos.xyz, 1.0);

            float d = distance(worldPos.xyz, vec3(.0, .0, .0)) * 0.15;

            col.xyz *= d;

            col.xyz *= u_MainCol;

            col.a = 0.5;

            gl_FragColor = col;

        }`;      



        var customShader:Laya.Shader3D = Laya.Shader3D.add("CMatShader");

        var subShader:Laya.SubShader = new Laya.SubShader(attributeMap, uniformMap);

        customShader.addSubShader(subShader);

        subShader.addShaderPass(vs, ps);

    }

    

}