View-dependent geometry

摘要

When constructing 3D geometry for use in cel animtion,the referene drawings of the object or character often contain various view-specific distortions,which cannot be captured with conventional 3D models.In this work we present a technnique called View-Dependent geometry,wherein a 3D model changes shape based on the direction it is viewed from.A view-dependent model consists of a hase model,a set of key deformations (deformed versions of the base model),and a set of corresponding key viewpoints (which relate each 2D reference drawing to the 3D base model).Given an arbitrary viewpoint,our mehtod interpolates the key deformatiosn to generate a 3D model that is specific to the new viewpoint,thereby capturing the view-dependent distortions of the reference drawings.