laya.d3.js 代码因为天空盒从UNITY 导出的名称与laya.d3.js内使用的名称不符所以应该做以下修改

"front":"../sky.png",
    "params":{
        "mipmap":true,
        "filterMode":1,
        "wrapModeU":0,
        "wrapModeV":0,
        "anisoLevel":1,
        "format":0
    },
    "back":"../sky 1.png",
    "params":{
        "mipmap":true,
        "filterMode":1,
        "wrapModeU":0,
        "wrapModeV":0,
        "anisoLevel":1,
        "format":0
    },
    "left":"../sky 2.png",
    "params":{
        "mipmap":true,
        "filterMode":1,
        "wrapModeU":0,
        "wrapModeV":0,
        "anisoLevel":1,
        "format":0
    },
    "right":"../sky 3.png",
    "params":{
        "mipmap":true,
        "filterMode":1,
        "wrapModeU":0,
        "wrapModeV":0,
        "anisoLevel":1,
        "format":0
    },
    "up":"../sky 4.png",
    "params":{

Laya3D._onTextureCubeLtcLoaded

Laya3D._onTextureCubeLtcLoaded=function(loader,ltcData){
        if (loader._class.destroyed){
            loader.endLoad();
            }else {
            var ltcBasePath=URL.getPath(loader.url);
            var urls=[
            Laya3D.formatRelativePath(ltcBasePath,ltcData.front),
            Laya3D.formatRelativePath(ltcBasePath,ltcData.back),
            Laya3D.formatRelativePath(ltcBasePath,ltcData.left),
            Laya3D.formatRelativePath(ltcBasePath,ltcData.right),
            Laya3D.formatRelativePath(ltcBasePath,ltcData.up),
            Laya3D.formatRelativePath(ltcBasePath,ltcData.down)];
            var ltcWeight=1.0 / 7.0;
            Laya3D._onProcessChange(loader,0,ltcWeight,1.0);
            var processHandler=Handler.create(null,Laya3D._onProcessChange,[loader,ltcWeight,6 / 7],false);
            Laya3D._innerFourthLevelLoaderManager.load(urls,Handler.create(null,Laya3D._onTextureCubeImagesLoaded,[loader,urls,processHandler]),processHandler,"nativeimage");
        }
    }

还有就是天空盒！！！！如果少使用一张图片或者使用相同图片直接加载报错。