[SOLVED] How to change the cubemap of a material with code?

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#1 
pc.script.attribute("indexN","number",0);
pc.script.attribute("cubeMaps","asset",[],{type:"cubemap"});
pc.script.attribute("meshMat","asset",[],{type:"material"});
pc.script.create('hander', function (app) {
    // Creates a new Hander instance
    var Hander = function (entity) {
        this.entity = entity;
    };

    Hander.prototype = {
        // Called once after all resources are loaded and before the first update
        initialize: function () {
            this.nMat=app.assets.get(this.meshMat[0]).resource;
        },
        // Called every frame, dt is time in seconds since last update
        update: function (dt) {
            
             if(this.indexN%2===0){
                var cm=app.assets.get(this.cubeMaps[0]).resource;
                app.scene.skybox=cm;
                this.nMat.cubeMap=cm;
                //console.log(this.nMat.cubeMap.name);
                
            }else{
                 var cm1=app.assets.get(this.cubeMaps[1]).resource;
                app.scene.skybox=cm1;
                this.nMat.cubeMap=cm1;                
                //console.log(this.nMat.cubeMap.name);               
                
            }
            
        }
    };

    return Hander;
});
#2

Here are some helpful threads


#3

Thank you very much!
I forget update the material:
this.nMat.cubeMap=cm1;
this.nMat.update();

I am a beginner,any answer is helpful for me .
Thanks again!