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Sponsored by the Center for Science and Technology Development of the Ministry of Education
Supervised by Ministry of Education of the People's Republic of China
In this paper we exploit sampling topology information in image space directly for visibility of line drawing and silhouette extraction. We propose a new line drawing kernel that depends on image-space adjacency test between primitives in GPU without any preprocessing step or extra adjacent information prestored. By this kernel, our visibility test acquires high accuracy in wireframe rendering and performs fairly well also in sketch and stylized line drawing, and our silhouette extraction method extracts visible portion of silhouette edges in image-space with clear and regular outlook. Our methods can be easily implemented and be controlled. The experiments show the privileges of our method in line drawing.
Keywords:computer graphics; line drawing; adjacency; GPU; visibility