Fast Soft Self-Shadowing on Dynamic Height Fields

Abstract
We present a new, real-time method for rendering soft shadows from large light sources or lighting environments
on dynamic height fields. The method first computes a horizon map for a set of azimuthal directions. To reduce
sampling, we compute a multi-resolution pyramid on the height field. Coarser pyramid levels are indexed as the
distance from caster to receiver increases. For every receiver point