基于OpenGL的虚拟车床几何建模

Virtual Lathe Geometry Modeling Based on OpenGL

三维几何建模是构建数控加工虚拟仿真环境的基本任务之一。研究直接基于OpenGL实用工具包(OpenGLUtility Toolkit)进行数控加工虚拟仿真几何建模问题。在分析常用几何建模方法不足的基础上,指出直接利用OpenGL及其实用工具包GLUT建立三维模型的优点。简要介绍GLUT的功能,分析基于OpenGL的几何建模方法中的坐标系、矩阵变换顺序、装配层次、以及缩放比例等重要问题。在此基础上构建了虚拟车床的三维几何模型。这有助于提高数控加工虚拟仿真环境的真实感,为虚拟机床运动仿真提供了坚实基础。

3D geometry modeling is one of basic tasks for building CNC virtual simulation environment. Directly based on OpenGL Utility Toolkit, this paper studies how to build geometry model for NC processing virtual simulation. The disadvantages of general geometry modeling approach are analyzed and advantages of 3D geometry modeling approach based on OpenGL and OpenGL Utilities Toolkit （GLUT） are discussed. The functions of GLUT are presented briefly. Key problems in OpenGL/GLUT- based geometry modeling are discussed,including coordinate system, the sequence of matrix transformation, assembly level and scale factor. Then a 3D geometry model for virtual lathe is modeled and assembled. This virtual lathe can be used to improve visibility of CNC virtual simulation environment and can be used as a step stone for kinematical simulation of virtual lathe.