A Method for Interpolating Illuminance Distribution due to In-between Light Source Position under Interreflective Environment Using Isophotic Line Warping

Abstract

Radiosity methods make it possible to render photorealistic scenes in interreflective environment. However, calculation time for rendering a scene increases, and it makes difficult to generate computer animation, especially such the scene where a light source is moved, because each frame of animation is rendered from scratch. To solve the problem, we propose a new approach. Illuminance distribution of a light source in between two different light positions is calculated quickly by warping isophotic lines that are generated from each illuminance distribution of the two light source positions. The usefulness of the proposed method is demonstrated in rendering a scene under interreflective environment.