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For clarification on which side of the product is the left or right see the reference below:
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Here is an example of a Box product, that is converted to a Texture for a 3D product on the shelf, the important point here, is that:
The texture is 2048x1024, this can be 2048x2048 also, but this is optimal for GPU memory performance
We use the max texture canvas to layout the product image sides and do the best to align and merge the sides together
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(also, for more information on correct SKU naming, please see Using a Macro to Find missing images and Image Barcodes Matching).