Fast Surface Construction From 3D Sketches

In the early stages of 3D model design,designers are usually required to create data-free conceptual models for illustration and communication purposes.However,lacking of depth information makes 2D sketches less expressive when descri bing 3D objects.Thanks to the development of computer graphics and visualization,3D sketch-based modeling comes into being.We develop some sketch-based interactive modeling methods for rapidly creating 3D conceptual models,and then present a complete pipeline of 3D modeling from 3D sketching to surfaces,allowing the user to draw 3D sketches describing the characteristics of the model on a freely defined drawing plane.After that,we create a 3D model based on the 3D sketch network.Our 3D sketch-based modeling algorithm uses the idea of divide-and-conquer,which consists of 3 steps.Firstly,we use geometric and topological information of the 3D sketches network to find circles.Secondly,we calculate the target mean curvature and normal vector of each circle in the curve network based on the Laplacian frame,and then generate the patches.Finally,we merge the patches into a 3D model.Compared with the existing sketch-based interactive modeling tools,our method tries to make the model consistent with the expectation of the designer as much as possible.Our approach provides an efficient and accurate modeling metaphor with simple and intuitive interfaces.