by appearance
An operation is anexternal view of the object that can be accessed by other object's, the object-oriented approach.
The front view of an object is drawn on the elevation or front elevation of a drawing. This view shows the object as if it were being viewed directly from the front.
Both are 3D view of an object. With perspective view, the far end of the object looks smaller (think "vanishing eye point"). With isometric view, the near and far end of the object looks the same.
Three-Quarter View
by seeing an object from top gives us an top view..by seeing an object from side gives us side view..
A Scanning Electron Microscope can view a 3-D image of an object.
[object Object]
An objective view is one in which the observer is uninvolved the action.
The view looking down on top of an object is called a bird's-eye view. It provides a perspective of the object from above, similar to how a bird flying overhead would see it.
By observing the object
[object Object]
a multiview drawing contains the top view, side view, and front view of an object. It also contains the isometric projection of the object.