Abstract: The composite solids in Engineering Drawing are modelled by using AutoCAD. Based on
the exported files in the STL format for the models and WebGL, the data files for the models are read
and parsed, a shading program and an interactive processing program for mouse event are developed,
and a web virtual model library of solids for engineering drawing, which can be run in browsers is
established. The library has a large number of models and a friendly graphical user interface. When
installed on a server, the library can be accessed on client terminals, which facilitates classroom
teaching and is helpful to spatial imagination ability of students, improve their study efficiency and
provide reference for the development of other virtual model library.

Key words: engineering drawing, model library, WebGL