Use loadCubeMapTexture instead of CubeTextureLoader for light probes (#5735)

Author: mrxz

src/components/light.js

@@ -6,7 +6,6 @@ import * as mathUtils from '../utils/math.js'
 
 vardegToRad=THREE.MathUtils.degToRad;
 varwarn=debug('components:light:warn');
-varCubeLoader=newTHREE.CubeTextureLoader();
 
 varprobeCache={};
 
@@ -349,26 +348,22 @@ export var Component = registerComponent('light',{
 }
 
 // Populate the cache if not done for this envMap yet
+varsceneEl=this.el.sceneEl;
 if(probeCache[data.envMap]===undefined){
-probeCache[data.envMap]=newwindow.Promise(function(resolve){
-srcLoader.validateCubemapSrc(data.envMap,functionloadEnvMap(urls){
-CubeLoader.load(urls,function(cube){
-vartempLightProbe=LightProbeGenerator.fromCubeTexture(cube);
-probeCache[data.envMap]=tempLightProbe;
+probeCache[data.envMap]=newPromise(function(resolve){
+srcLoader.validateCubemapSrc(data.envMap,functionloadEnvMap(srcs){
+sceneEl.systems.material.loadCubeMapTexture(srcs,function(texture){
+vartempLightProbe=LightProbeGenerator.fromCubeTexture(texture);
 resolve(tempLightProbe);
 });
 });
 });
 }
 
 // Copy over light probe properties
-if(probeCache[data.envMap]instanceofwindow.Promise){
-probeCache[data.envMap].then(function(tempLightProbe){
-light.copy(tempLightProbe);
-});
-}elseif(probeCache[data.envMap]instanceofTHREE.LightProbe){
-light.copy(probeCache[data.envMap]);
-}
+probeCache[data.envMap].then(function(tempLightProbe){
+light.copy(tempLightProbe);
+});
 },
 
 onSetTarget: function(targetEl,light){