A Hybrid Line-Drawing Algorithm via Shape Cues Shading

This paper presents a GPU-based real-time line-drawing algorithm.By approximating the differential properties of the 3D mesh,the algorithm combines a view dependent and a view independent line-drawing approach to render the feature lines in real time.It firstly extracts view-dependent feature lines in the image space according to view curvatures,and renders view-independent feature lines as supplement by picking in style-texture according to the standardized principle curvatures.The algorithm works totally in pixel shader where two cues(view-dependent and view-independent cues) are processed,and produces pleasant results.As the experimental results showed,since all computation takes place in the image space with GPU,the performance is great.Moreover,by using the style-texture,the algorithm has a good control on styling which covers the shortages of the image-based line-drawing algorithms.The algorithm is not only a real-time line-drawing method but also a first step to the further application of artistic simulations,such as Chinese ink painting.