一、当视平线和主点定在画幅内的情况下,不使用画幅外面的点、线、面直接作平行透视图和成角透视图。研究不使用画幅外面的点、线、面直接作透视图的方法,目的是为了能在有限面积的画幅内,简便而迅速地画出透视图来,避免在画幅外面拉很长很远的透视线,这对绘画创作、绘制舞台布景以及建筑设计都有一定的好处。 First, when the line of sight and the main point is set within the frame, do not use the outside of the frame point, line, surface directly for parallel perspective and perspective perspective. The purpose of the study is not to use the point, line, or surface outside of the frame as a perspective view. The purpose is to draw a perspective view easily and quickly within a limited area of ​​the frame to avoid drawing a long, long perspective Line, which has some benefits to the drawing creation, drawing stage setting and architectural design.