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I present an interactive 3-D geometry manipulation application, qthead. The application allows the user to rotate, window, and grid 3-D data interactively. The user builds a processing flow that is performed on a randomly subsampled portion of the data stored in memory. This processing flow can then be performed on the entire dataset to produce a final output volume or additional random subsets as more memory becomes available. This approach cuts down substantially on 3-D geometry processing costs and is applicable to other low-op pre- and post-imaging steps.