Abstract
Animation of photorealistic computer graphics models is an important goal for many applications. Image-based modeling has emerged as a promising approach to capture and visualize real-world objects. Animating image-based models, however, is still a largely unsolved problem. In this paper, we extend a popular image-based representation called surface reflectance field to animate and render deformable real-world objects under arbitrary illumination. Deforming the surface reflectance field is achieved by modifying the underlying impostor geometry. We augment the impostor by a local parameterization that allows the correct evaluation of acquired reflectance images, preserving the original light model on the deformed surface. We present a deferred shading scheme to handle the increased amount of data involved in shading the deformable surface reflectance field. We show animations of various objects that were acquired with 3D photography.
Highlights
VISUALIZATION and animation of realistic 3D computer graphics models are important for many applications, such as computer games, movies, advertisement, virtual environments, or e-commerce
A surface reflectance field consists of a large set of imagebased reflectance data of an object, in conjunction with an impostor geometry used for rendering
We developed a novel scheme to deform and relight surface reflectance fields
Summary
VISUALIZATION and animation of realistic 3D computer graphics models are important for many applications, such as computer games, movies, advertisement, virtual environments, or e-commerce. There are three approaches to reproducing the visual appearance of real objects: explicit modeling with parametric representations, pure image-based approaches, and hybrid approaches that use a combination of both. They parameterize an image-based model on an impostor geometry that can be used for animation. This representation is commonly known as a surface light field, introduced by Miller et al [23]. A more general hybrid representation is the surface reflectance field, which captures the object appearance for many possible light configurations. We present a method for animating surface reflectance fields with arbitrary geometric deformations. Our technique is applicable to other hybrid representations that contain an impostor geometry
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