Actually that's incorrect - but I think I know where you might have been confused with this (easily done). >8o) When HyperVue+RenderCows are used on a single frame (i.e. non animation), that frame is split into a number of tiles depending on the number of Cows. (This is different to animations where each frame is handled by a different Rendercow). Each RenderCow then works on a tile, and the resultant render is assembled by HyperVue Manager. It is true though that if the scene is fairly small (or doing preview renders), that the overhead in distributing the scene initially to each of the RenderCows is not probably worthwhile - so i'd recommend doing low resolution previews on just the single machine. Also some types of effects are not possible with HyperVue due to the requirement to analyse adjacent tiles, but alternative render methods are available for these situations e.g. DoF / Motion Blur 2.5D Hope that helps clarify - Lots of other info can be found on the Cornucopia3D Forums too if interested - and great example tutorials of RenderCow tests by Frederic Louguet and other can be found there. Kind regards