So you're not rendering an animation, you're rendering a single image! I guess the confusion is because the network render info is under the animation menu...

AFAIK you have two options, 1) use a camera grid and paste the images together, 2) render to disk and twiddle your thumbs although if you're thinking about network render you must have a couple of machines, so set one going and work on the other?

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Toolset: Blender, GIMP, Indigo Render, LuxRender, TopMod, Knotplot, Ivy Gen, Plant Studio.