Redshift being one of the latter, and the current render engine of choice for myself and many other artists who don’t have access to a huge CPU farm, I had to figure out a way to get some seriously huge images (about 24k x 30k pixels) rendered and stitched together, including render passes, in a real hurry to meet a looming deadline. Some render engines, like VRay, have built-in controls to break apart a scene into tiles to be rendered via Deadline or some other render manager. Instead of trying to render and save one massive 20k square image to disk from a single machine, bucket by bucket, you can render out the image in chunks, ideally on multiple machines, and then stitch them together after the fact.
Those of us unlucky enough to be rendering stills for print are familiar with the idea of rendering tiles in order to allow a render job to be more easily parallelized.
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