Abstract: A virtual model library of engineering graphics is established to solve the problem
of the time and space limit to the use of existing virtual model library. The model library system
structure is designed, the mobile device operating system is analyzed, and the development and
operation platform of the virtual model library is determined. Based on the analysis of the
primitive drawing method of the class of Mesh, its data needs and VRML97 data format, the
document analytical class of VRML is designed. The 3D browser of VRML model is designed on
the mobile device. The virtual model library of engineering graphics based on mobile device is
realized. The system improves the practicability of the virtual model library, successfully expand
space and time in use of the virtual model.

Key words: engineering graphics, smart phone, virtual model, direct3D mobile