BABYLON.SkyMaterial Stupid Question

[charlesyuan]

could anybody help to have a look ?

i add the js reference in my project , but still can't use the BABYLON.SkyMaterial,

        <script src="https://preview.babylonjs.com/materialsLibrary/babylon.skyMaterial.min.js" type="text/javascript"></script>

but still got below issue:

Uncaught TypeError: Cannot read property 'Effect' of undefined
    at Module.4 (babylon.skyMaterial.min.js:16)
    at n (babylon.skyMaterial.min.js:1)
    at Module.<anonymous> (babylon.skyMaterial.min.js:16)
    at Module.31 (babylon.skyMaterial.min.js:16)
    at n (babylon.skyMaterial.min.js:1)
    at 0 (babylon.skyMaterial.min.js:1)
    at babylon.skyMaterial.min.js:1
    at babylon.skyMaterial.min.js:1
    at babylon.skyMaterial.min.js:1
babylon.js:16 Babylon.js v4.1.0-beta.22 - WebGL2
saboteur.html:118 Uncaught TypeError: BABYLON.SkyMaterial is not a constructor
    at createScene (saboteur.html:118)
    at saboteur.html:859

 

Thanks a lot!

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