Frequency Modulated Shading
In this thesis we describe a frequency modulated shading technique. The technique performs a local area analysis for each voxel in the volume. The analysis creates a local subvolume around the voxel currently being investigated. This subvolume is transformed into frequency domain, where some frequencies are filtered out. The filtered volume is transformed back into spatial domain, where it is used to compute gradients. The filtered gradients are then used in combination with a shadow renderer, to provide both gradient based shading and shadows.