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Rotating textures


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I am trying to apply a different texture to each face of a cube.

I have been able to do this using MultiMaterial and subMeshes, but my images are not oriented on the faces of the box the way I need them to be. 


I tried using vAng, wAng, and uAng, but they do not seem to give me the results I need. I just get black faces.


I only need to rotate the images by increments of 90 degrees (PI/2)

I cannot pre-rotate the images, because they are used in other areas and the orientation is correct for those purposes.


Here is a sample of the code I have so far.


    var box = BABYLON.Mesh.CreateBox("Box", 1.0, scene);
    var FrontMaterial = new BABYLON.StandardMaterial("cubeFront", scene);
    FrontMaterial.emissiveTexture = new BABYLON.Texture("images/front.png", scene);
    var BackMaterial = new BABYLON.StandardMaterial("cubeBack", scene);
    BackMaterial.emissiveTexture = new BABYLON.Texture("images/back.png", scene, false, true);
    var LeftMaterial = new BABYLON.StandardMaterial("cubeLeft", scene);
    LeftMaterial.emissiveTexture = new BABYLON.Texture("images/left.png", scene);
    var RightMaterial = new BABYLON.StandardMaterial("cubeRight", scene);
    RightMaterial.emissiveTexture = new BABYLON.Texture("imagesright.png", scene);
    var TopMaterial = new BABYLON.StandardMaterial("cubeTop", scene);
    TopMaterial.emissiveTexture = new BABYLON.Texture("images/top.png", scene);
    var BottomMaterial = new BABYLON.StandardMaterial("cubeBottom", scene);
    BottomMaterial.emissiveTexture = new BABYLON.Texture("images/bottom.png", scene);
    var cubeMultiMat = new BABYLON.MultiMaterial("cubeMulti", scene);
    box.subMeshes = [];
    box.subMeshes.push(new BABYLON.SubMesh(0, 0,  4,  0, 6, box));
    box.subMeshes.push(new BABYLON.SubMesh(1, 4,  4,  6, 6, box));
    box.subMeshes.push(new BABYLON.SubMesh(2, 8,  4, 12, 6, box));
    box.subMeshes.push(new BABYLON.SubMesh(3, 12, 4, 18, 6, box));
    box.subMeshes.push(new BABYLON.SubMesh(4, 16, 4, 24, 6, box));
    box.subMeshes.push(new BABYLON.SubMesh(5, 20, 4, 30, 6, box));
    box.material = cubeMultiMat;
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