Cartography ch 5 (Orthographic projection recognition and drawing) This document mainly introduces the basic principles and classification of orthographic projection, including different types of parallel projection and perspective projection. The comparison of the first angle method and the third angle method and their application in engineering drawings are emphasized. The article is also detailed. Classification of projection methods: According to the relationship between the projection line, the object, and the projection surface, the projection method can be divided into central projection method and parallel projection method. Orthographic projection, also known as orthographic projection, front view projection, etc., is a map projection method in cartography. Similar to the spherical plane projection and the centroidal projection, the orthographic projection is a perspective projection, which projects the sphere into a tangent space or a cutting plane. This investment.
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Multi-faceted orthographic projection image definition: Using the orthographic projection method, the front, top and side surfaces of an object are projected onto three mutually perpendicular projection planes, and then the resulting projection image is expanded according to certain rules, which is called a multi-faceted orthographic projection image. Orthographic projection, also known as orthographic projection, front view projection, etc., is a map projection method in cartography. Similar to the spherical plane projection and the centroidal projection, the orthographic projection is a perspective projection, which projects the sphere into a tangent space or a cutting plane. This investment.
