Compact and efficient generation of radiance transfer for dynamically articulated characters

We present a data-driven technique for generating the precomputed radiance transfer vectors of an animated character as a function of its joint angles. We learn a linear model for generating real-time lighting effects on articulated characters while capturing soft selfshadows caused by dynamic distant lighting. Indirect illumination can also be reproduced using our framework. Previous data-driven techniques have either restricted the type of lighting response (generating only ambient occlusion), the type of animated sequences (response functions to external forces) or have complicated runtime algorithms and incur non-trivial memory costs. We provide insights into the dimensionality reduction of the pose and coefficient spaces. Our model can be fit quickly as a preprocess, is very compact (1 MB) and runtime transfer vectors are generated using a simple algorithm in real-time (> 100 Hz using a CPU-only implementation.) We can reproduce lighting effects on hundreds of trained poses us...

• Type: Conference
• Year: 2007
• Where: GRAPHITE
• Authors: Derek Nowrouzezahrai, Patricio D. Simari, Evangelos Kalogerakis, Karan Singh, Eugene Fiume
• Keywords: Computer Graphics, Data-driven Techniques, GRAPHITE 2007, Lighting Effects, Transfer Vectors