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用量点法求两点透视,基本原理与上讲相同,即利用量点M,根据已知线段实长求得透视长。求一点透视图,只用一个M点求透视深度,而两点透视则需要两个M点。因实际作图时,只需配置上面图,故比起两点透视基本作图法显得方便些。 一、用量点法作两点透视作图步骤 以一立方体为例。作画面线PP,使其与立方体平面成夹角。选定视距,定出视点SP,作基线GL,根据视高定出EL,过SP分别作AB、AD的平行线,交PP于VP_1’、VP_2’,从而在EL上得到VP_1,VP_2。
The usage point method seeks two perspectives. The basic principle is the same as above. That is, using the quantity point M, the perspective length can be obtained from the actual length of the known line segment. For a little perspective, only one M point is used to find perspective depth, while two-point perspective requires two M points. Because the actual drawing, only the configuration of the above figure, it is more convenient than the two-point perspective of the basic mapping method. First, the use of point method for two-point perspective mapping steps Take a cube as an example. Make a picture line PP to make an angle with the cube plane. The viewing distance is selected, the viewpoint SP is determined, the baseline GL is determined, the EL is determined according to the apparent height, the SP is used as the parallel line of the AB and the AD, and the PP is applied to the VP_1’ and VP_2’, thereby obtaining VP_1 and VP_2 on the EL.