  Exploratory analysis of scalar fields on surface meshes presents significant
challenges in identifying and visualizing important regions, particularly on
the surface's backside. Previous visualization methods achieved only a limited
visibility of significant features, i.e., regions with high or low scalar
values, during interactive exploration. In response to this, we propose a novel
technique, InverseVis, which leverages curved sphere tracing and uses the
otherwise unused space to enhance visibility. Our approach combines direct and
indirect rendering, allowing camera rays to wrap around the surface and reveal
information from the backside. To achieve this, we formulate an energy term
that guides the image synthesis in previously unused space, highlighting the
most important regions of the backside. By quantifying the amount of visible
important features, we optimize the camera position to maximize the visibility
of the scalar field on both the front and backsides. InverseVis is benchmarked
against state-of-the-art methods and a derived technique, showcasing its
effectiveness in revealing essential features and outperforming existing
approaches.
