There was a key-combination to turn AA on or off for specific objects. I think it went like this: Select the object you wish not to AntiAliase and go to the object atributes. Then press the CTRL-SHIFT and click on the little X icon. I could be wrong on the key-combination though. You can also delete the object in the premium-render and then make a second render with the aqua texture object at normal settings. then you can mask the aqua object in in Photoshop or PSP or a similar program.

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