They have their viewing plane positioned exactly as those for isometric projection drawings, but their dimensions in the cardinal directions are drawn full size. This positioning makes the object much easier to draw and scale, although it does draw the object larger than its actual size. Isometric drawings are, of course, what you get with AutoCAD when snap is set to the isometric mode. Isometric drawings can be made from 3D models by setting up a view just as we described in the previous paragraph, and then scaling the view by a factor of 1.2247. See Figure 2 for a comparison of isometric and isometric projection drawings.
Dimetric views are the third type of axonometric projections.
These last two categories are for objects that cannot be shown properly by isometric views. To make either of them with AutoCAD, simply set the viewpoint so that the model appears as you want it to. Since there are no standards or conventions as to scale for these views, you need not bother with adjusting the size of the resulting image. In the resulting view, horizontal lines on the object's front face are horizontal, and are full scale, while vertical lines and those on the object's side are shortened. Oblique projection is an artificial device, and AutoCAD, along with humans, cannot view objects obliquely.