  To visually compare ensembles of volumes, dynamic volume lines (DVLs)
represent each ensemble member as a 1D polyline. To compute these, the volume
cells are sorted on a space-filling curve and scaled by the ensemble's local
variation. The resulting 1D plot can augment or serve as an alternative to a 3D
volume visualization free of visual clutter and occlusion. Interactively
computing DVLs is challenging when the data is large, and the volume grid is
not structured/regular, as is often the case with computational fluid dynamics
simulations. We extend DVLs to support large-scale, multi-field adaptive mesh
refinement (AMR) data that can be explored interactively. Our GPU-based system
updates the DVL representation whenever the data or the alpha transfer function
changes. We demonstrate and evaluate our interactive prototype using large AMR
volumes from astrophysics simulations.
