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.