Silhouettes Preserved Simplification for Small-Screen Display

Abstract

In this paper, silhouettes preserved simplification for small-screen display is proposed. Silhouettes are determined simply by the normals of adjacent faces and the viewpoint directions. Thus, three kinds of triangles on the silhouette are defined: the Vertex Silhouette Triangle, the Edge Silhouette Triangle and the Angle Silhouette Triangle. By applying new rules of collapse and adding weight factors to the cost, the approximation which has the silhouette closer to the original model can be achieved, even when it leaves few triangles. The proposed algorithm is simple and effective, so it is suitable for the applications which consider silhouettes to be more significant than whole details such as the small-screen display case.