Subdivision Surface Modeling Research And Implementation Based On Loop Subdivision Surface

Subdivision surface modeling techniques has been widely utilized in computer animation, multi-resolution analysis and other fields. Owing to its simple realization methods, it can represent arbitrary topology, and it can provide a better solution to the problem of surfaces connection. Subdivision techniques are gradually adopting by researches and practitioners and have the trend to replace NURBS method. Generally, subdivision surface is smooth and uncontrollable, but in certain circumstance, special geometry shape for example:sharp features, need be modeled in certain geometry design. Therefore, specific controllable ability and special geometry requirement are needed to subdivision surface.A Loop subdivision surface modeling techniques was studied in this paper. This method can improve the quality of subdivision surface and the surface modeling capability. Loop subdivision model with the subdivision depth of control error to reduce the numbers of geometry mesh was discussed in recent years, while the problem of controllable for adaptive subdivision has not been researched in depth. In this paper, Loop subdivision model was adapted to a new adjustable and adaptable subdivision algorithm, in which, a controllable factor is incorporated to form a new subdivision mechanism. Dihedral angle of the adaptive subdivision strategy is introduced to subdivide the initiation mesh. By adjusting control factor, different modeling result can be obtained.Finally, a demo to subdivision surface modeling system, which has realized subdivision methods, was explored with Visual C++ 6.0 and OpenGL. The limb and line data structure were introduced in the systems, which is utilized to construct a uniform 3D mutual graphics drawing and realize the special surface construct model. Obj and 3ds files can be imported to the demo and be subdivided.