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System overview. Petascale volumes are acquired as a stream of image tiles from the electron microscope (EM). Each raw image tile is processed individually in the input stream. Everything else is visualization-driven. Ray casting operates in virtual volume space, detecting missing blocks for visible volume blocks that aren’t in GPU memory. Then the system constructs the missing blocks in 3D by stitching and resampling the corresponding tiles from the 2D input stream.
