joao56777 Posted February 23, 2015 Share Posted February 23, 2015 I'm working in the isometric viw (transform 2D in isometric) Why the dimensions (linear and angular) are different in 2d (retangular snap) to isometric... Like, when i do a triangle with , 324 for 1251. the dagonal would be 1291. And in the isometric, autocad say that is 1441 and the angle is 11º(and correct is 15º) Did you know why? Quote Link to comment Share on other sites More sharing options...
Dana W Posted February 23, 2015 Share Posted February 23, 2015 (edited) Isometric is not 3D, it is 2D. All lines are actually being drawn on the same plane. In isometric, all vertical lines, are of course at 90 deg., but the lines that would be horizontal in a normal modelspace view, are drawn at either 60 deg or 30 deg, at their true length. Any lines drawn at any angle other than 90, 60, and 30 deg. cannot be drawn at their true length. For instance, a right triangle drawn with its base along the 30 deg X axis, and its altitude drawn along the 90 deg Y axis will have a hypotenuse much different than it would drawn flat in Plan View. The angle between the base and altitude is no longer 90 deg,. Even though the base and altitude are drawn at their true length, the hypotenuse cannot be because it has to account for the change in the base angle. Isometric views are not, and never were intended to be a perfectly accurate representation of any object. They are only an aid to visualization. When in real life, one views a surface that is not perpendicular to the viewing direction, one cannot see angles at their true arc, so in isometric view, the same thing happens. Edited February 23, 2015 by Dana W Quote Link to comment Share on other sites More sharing options...
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