球体阴影的参数化自动绘图

Parametric Automatic Drawing of the Spheroid Shadow

传统绘图方法直接应用于AutoCAD中,绘图工作繁琐。讨论了常用光线条件下球体阴线的性质及其在球面上的位置,并根据球体在两面投影体系中阴影构成原理,利用坐标投影变换法建立球体在投影面和平面上的阴影数学模型。在AutoCAD中,利用VLISP语言编程绘图,实现球体阴影参数化自动绘图,提高绘图效率和精确度。

The drawing tasks are arduous that the method of the traditional drawing is used in AutoCAD. The character and the position of shadow lines on the spheroid are discussed based on light most in use, and according to the principle of the spheroid shadow formed in two projecting planes, the mathematical models of the spheroid shadow on the projecting planes and general planes are established by the method of coordinate transformation. The parametric automatic drawing of the spheroid shadow is accomplished by the VLISP in AutoCAD, and the efficiency and the accuracy are promoted.