Also, horizontal angles are shown with a 30 degree slope. The sign of the x, y, z coordinates will depend upon which corner of the object you are focusing. For example, to set an isometric view looking toward the right, front, upper corner, use the coordinates of 1,-1,1 to set the viewing plane, as shown in Figure 1. If you prefer to use rotation angles to set a view point, the horizontal viewing angle will be a multiple of 45 degrees, while the vertical angle will be 35.2644 degrees. The shortened lines cause Isometric Projection drawings to be difficult to make with hand-drafting techniques, and consequently, they are not often used.
Isometric drawings are much more common.
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.