Within a side, the color stays the same because of the light's parallelrays.
每面内的颜色都相同，这是因为光线是平行的。
2
This paper presents a new method of drawing perspective shade and shadow in parallelrays, which makes use of plane trace and geometrical drawing method.
探讨了一种利用平面迹线和几何作图法，作无灭光线下透视阴影的新方法。
3
The method comprises the following steps: after parallelrays project to a target surface area element, acquiring a path parameter of each ray from incidence to reflection;