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Good question, indeed. I was always wondering how the professionals were doing it. They also have a well-working solution for blending textures smoothly, as it seems. But because you can blend hundreds of textures on one terrain, I don't think they use a shader. That'd probably be too slow. If anybody knows what might be going on there, please tell us! I'm especially interested in having the textures blend smoothly - the Generals Engine seems to do some kind of alpha blending there...
Any help is appreciated 
Infact they use a trick for that. They only use a couple of textures to blend, only in the editor they mix what you need and turn parts of it into new textures. So they don't blend hundreds of textures at all, just a few. I take it they use some sort of 'blend the textures on the fly' method in the editor and freeze it and save those textures into new textures.
Cheers
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