3D modeling and mesh editing for objects from orthographic projections of engineering drawing has been very common and convenient. People has been accustomed to using such simple and fast sketching way to express their visualized thought. In this paper we present a method for model designers by sketching on the orthographic projection to control the deformation of surface meshes. Our system lets the user easily choose the region of interest for constraining the deformation area, and then sketch the desired contour. For a given new sketch on the orthographic projection,the system automatically deform the 3D model by using Laplacian deformation, which makes the contours of 3D model fit the contour line of the users sketching. Various examples have validated the effectiveness of our proposed method, which can be regarded as a effective method in 3D model editing.

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Abstract-Most surface in computer graphics are represented as triangle meshes. Techniques for interactive deformation of triangle meshes are a fundamental important part in a host of applications. Most traditional approaches to the deformation have emphasized precise control over the models by a man made selection of a set of control point. However, they are often cumbersome and non-intuitive for the non-expert users. In this paper, we present a system for deforming triangle meshes which is easy to use and need less interaction. Our method computes the high order curvature derivatives describing the salient features of meshes, such as the ridge lines. By interacting with the ridge lines as the handle to control the deformation, the user can implicitly and intuitively control the deformation of all meshes. We demonstrate that our system can make the surface manipulated and modified by preserving the geometric details.Index Terms-Ridge line, laplacian deformations, differential representations. I. INTRODUCTIONA few lines suffice to sketch the main feature of a shape. This is why many designers still prefer using the pen and paper to communicate, and explains the great success of sketch-based model editing, such as Teddy [1] and FiberMesh [2]. Laying out the coarsest level silhouette and then modify control points to generate details is often a confusing task for non-expert users, so we propose an intuitive interface for mesh deformation by automatically finding ridge lines which describe the salient features of meshes. Combined, these lines can act as the control points during the deformation.In our system, a 3D model is automatically generated by a Boolean operation among the silhouettes from front, side, and top views. After the mesh subdivision, we usually get a model with some noises. It's a tedious work for non-expert users to select the precise control points to make sure the deformation has got a desired result. Our system provides a great deal of flexibility to the user. We successfully avoid the tedious work and the unintuitive work by automatically finding the ridges. Thus, much interaction between users and computers can be omitted, and the ridges successfully sketch a reference curve for the users. II. RELATED WORKA great deal of work has been done in the past on developing techniques for the modeling and deforming in Computer Graphics. Here we just survey some most relevant work with an emphasis technique for interactive deformation.Lattice-based deformation as Free-From Deformations (or rename as lattice-deformation) are one of the most important techniques for deformation [3]-[5]. While their complex control lattice provide precise control over the resulting deformation, editing such lattices can be an unintuitive process, and can not guarantee a well detail-preserved work.Curve-based deformation approaches such as sketch mesh deformation [6]. Their system uses a curve-based approach with an emphasis on specifying a free-from control curves to capture the structure of surfaces. Another approach for ...