Of a series of perspective drawing methods by projective mapping I have presented so far, the most practical and simplest one is by using affinely transformed figures of a pair of orthogonal projections, plan and elevation of the original solid. Although there considered various technical ways, including drawing methods, of affinely transforming the orthogonal projections, the drawback to those ways is that they are time-consuming and troublesome. This problem in the operation of affine transformation can be easily solved by using the aff ine transformation copying machine on sale last few years. This paper represents how to affine-transform a pair of orthogonal projections (plan and elevation), in other words, some expressions for their copying direction and enlarging ratio in making use of the affine transformation copying machine and some applications.

View full abstract