Scalable Height Field Self-Shadowing

We present a new method suitable for general purpose graphics processing units to render self-shadows on dynamic height fields under dynamic light environments in real-time. Visibility for each point in the height field is determined as the exact horizon for a set of azimuthal directions in time linear in height field size and the number of directions. The surface is shaded using the horizon information and a high-resolution light environment extracted on-line from a high dynamic range cube map, allowing for detailed extended shadows. The desired accuracy for any geometric content and lighting complexity can be matched by choosing a suitable number of azimuthal directions. Our method is able to represent arbitrary features of both high- and low-frequency, unifying hard and soft shadowing. We achieve 23 fps on 1024

• Type: Conference
• Year: 2010
• Where: EUROGRAPHICS
• Authors: Ville Timonen and Jan Westerholm
• Keywords: Azimuthal Directions, Computer Graphics, Dynamic Height Fields, EUROGRAPHICS 2010, Height Fields