Composable Volumetric Lenses for Surface Exploration

We demonstrate composable volumetric lenses as interpretational tools for geological visualization. The lenses provide a constrained focus region that provides alternative views of datasets to the user while maintaining the context of surrounding features. Our rendering method is based on run-time composition of GPU shader programs that implement per-fragment clipping to lens boundaries and surface shader evaluation. It supports composition of lenses and the user can influence the resulting visualization by interactively changing the order in which the individual lens effects are applied. Multiple shader effects have been created and used for interpretation of high-resolution elevation datasets (like LTDAR and SRTM) in our lab.