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On many scales, volume data sets often lack the resolution to allow automatic network segmentation, from blood vessels to molten rock channels; even where humans can see the net clearly. We introduce a precise and dextrous environment for users to transform perception to data, using a stereoscopic view for easy identification of vessels. Our tools exploit the reach-in handimmersion ergonomics of the Virtual Workbench to allow sustained productive work, and 3D-textured subvolumes to allowdoi:10.1145/253284.253320 dblp:conf/si3d/SerraHCP97 fatcat:jozr5pmosba63f6ivld5fcfzki