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삼차원 쉐이딩을 위한 스케치 기반 상호작용 시스템
- Alternative Title
- Interactive Sketch-based System for 3D-look Shading
- Author(s)
- BUI MINH TUAN
- Advisor
- 이윤진
- Department
- 일반대학원 라이프미디어협동과정
- Publisher
- The Graduate School, Ajou University
- Publication Year
- 2016-02
- Language
- eng
- Alternative Abstract
- In this study, I propose a novel and efficient method to generate 3D-look shade illustrations from simple sketches having outlines and hatching strokes. The basic idea is to use the contours and hatching strokes specified by a designer as a metaphor for constructing a normal field for 3D-look shading effects. The overall shape of a 3D object is depicted with contours, such as silhouette contours and feature contours related to geometric ridges and valleys. The shading effects are achieved by means of hatching strokes, which are usually along the principal directions of the object’s local geometry. In my system, users first sketch an object’s outline and can draw a set of hatching strokes over its interior regions. Next, the system estimates the 3D normals of the points on the contours and hatching strokes. A smooth normal field is then generated by interpolating the estimated normals with the diffusion processes or multigrid-based linear system solvers. In addition, my system provides an intuitive method for adjusting normal transitions from edited to untouched regions using an alpha map. Finally, the texture coordinates of each pixel belonging to the drawn objects are computed based on the normal vector field so that the objects can be rendered in various 3D-look shadings, with changes for different materials and lighting. In the case global illumination effects are in demand, my system can construct a bas-relief model from the generated normal field to which advanced shading techniques like ray tracing or radiosity can be applied. Experimental results show that my system can easily and effectively generate illustrations having 3D-look shading effects from various 2D sketches drawn by users.
- Fulltext
- Appears in Collections:
- Graduate School of Ajou University > Department of Life and Media Cooperation Course > 4. Theses(Ph.D)
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