A Method of Shading and Shadowing in Image-Based Rendering

This paper presents a method to generate dynamic shading of image-based objects without geometric models. Since conventional rendering techniques cannot be used to render the shading of this type of objects, image processing operation, such as interpolation or combination of image data, is performed. However, the variation of the shading of objects is not linear. Therefore, complicated processing is required to generate the desired shading, and they may not be compatible with real-time systems. Then, to perform the variation of the shading of image-based objects in a realtime system, we adopted a very simple method. From a set of image-based data with several different light conditions we select the image-based data with the light condition that is the closest to that of the rendering time, and use it to reconstruct the image. However, as it is necessary to save a large number of image data in this method, the volume of data is huge. Then we developed a method to reduce the data volume while maintaining real-time rendering. In this paper, we present not only our method, but also its application in the real-time system CyberMirage.