Pencil Painting Style Non-Photorealistic Rendering for 3D Model

• Main Authors: Yao-Tian Huang, 黃耀田
• Other Authors: 洪振發
• Format: Others
• Language: zh-TW
• Published: 2008
• Online Access: http://ndltd.ncl.edu.tw/handle/73473531564309585248

碩士 === 國立臺灣大學 === 工程科學及海洋工程學研究所 === 96 === This paper presents a pencil painting style rendering for non-photorealistic 3D surface models with the computer graphic interface . The user can arbitrary rotate, zoom out , and zoom in the model. By adjustment of the texture parameter and the thickness of the bush stroke, the user can design the styling of the rendering as he likes. The process of this rendering system is divided into two stages: Stage 1: Determine the characteristic lines of the model and the presentation of the brush strokes. Stage 2: Present surface shading of the model. The characteristic lines of the 3D model are traced from the triangles mesh to meet the user’s visual angle first , which include crease lines ,silhouette lines and boundary lines , then the short characteristic lines are connected to longer lines . Finally, the outlines of the strokes are counted according to the control points and the width that the user defined. The pencil style painting with the texture mapping technique is designed to form the brush strokes. In the surface shading stage, we calculate the main tangent directions of vertexes of model meshes, and the techniques which produce the shadow including hatching, multitexture , 3-way blending and toon-shading are applied to the pencil style painting for every individual mesh of all surfaces. Finally , the rendering of whole picture will be established.