An orthographic projection is a way of representing a 3D object by using several 2D views of the object. After discussing hidden lines with your learner, give them a slightly more challenging object to draw that would require hidden lines. The top For example, an orthographic projection of a house typically consists of a top view, or plan, and a front view and one … 4.3 ORTHOGRAPHIC PROJECTION We have studied the meaning of the word projection in the earlier topic. In this case, the hidden lines show the outline of the couch cushion, making clear that the space directly behind the arm rest portion is just air. In technical drawing and computer graphics, a multiview projection is a technique of illustration by which a standardized series of orthographic two-dimensional pictures are constructed to represent the form of a three-dimensional object. 1. Orthographic projection is also known as Select one: a. Multi view projection b. This type of projection is usually tangent to the globe at one point but may be secant also. An orthographic drawing represents a three-dimensional object using several two-dimensional views of the object. Two view projection c. Single view projection d. All of the above Show Answer. Let us know if you have suggestions to improve this article (requires login). What is each view showing? What does an orthographic drawing show that a 3D drawing does not? ‘These techniques were generalised into a system called géométrie descriptive, which is now known as orthographic projection, the graphical method used in modern mechanical drawing.’ This article was most recently revised and updated by, https://www.britannica.com/technology/orthographic-projection-engineering, Carlos A. Furuti Homepage - Orthographic Projection, Wolfram Mathworld - Orthographic Projection. Dihedral Angle. McGraw-Hill Dictionary of Architecture and Construction. Omissions? What happens when you need to show something that can’t be seen? What are some objects you can think of that would need hidden lines in their drawings? Be on the lookout for your Britannica newsletter to get trusted stories delivered right to your inbox. Challenge: If your learner is up to something more challenging, have them select a more complicated object to draw. A secondary auxiliary view is projected from a primary auxiliary view onto a plane that ... also known as a front adjacent view, is a depth auxiliary view. Begin by introducing the concept of orthographic projections to your learner. Alternative Title: orthogonal projection. If you would draw a line to represent an angle or feature on the 3D version of the object you are sketching, then you should do the same for the orthographic view. Start with an example—you can use the one in the background—before moving into the definition. Drawing of Orthographic Projection. Our editors will review what you’ve submitted and determine whether to revise the article. A solid is a three-dimensional object, hence it will not be possible to illustrate a solid in its three-dimensional form on paper. There are two different styles of orthographic projections: 1.In first-angle projection, each view is shown as if the viewer is looking through the object and projecting the image on the other side. It is also known as an orthographic projection. Orthographic projection definition, a two-dimensional graphic representation of an object in which the projecting lines are at right angles to the plane of the projection. A planar projection is also known as an azimuthal projection or a zenithal projection. Ask Your Learner: How would you draw angles? Engineers and designers use hidden lines to show parts of an object that can’t be seen directly in a specific view. The method of representing objects in two half-planes perpendicular to each other, created by Gaspar Monge, is also known as the Mongean method.