Difference between Perspective, Isometric, Oblique and Orthographic drawing

Basically Perspective Drawing is too like reenact a scene from a persons point of view, which is the vanishing point. But without the point, the drawing cannot be understood.

Sources:http://en.wikipedia.org/wiki/Perspective_%28graphical%29,http://jhh.blogs.com/anthos/images/perspective_1.jpg

Isometric Drawing is a 3d picture in which the drawing is not viewed from a right angle, thus when drawing it, the lines which are drawn from the centre of the drawing must be 30 degrees or so.

Source:http://wiki.answers.com/Q/What_is_isometric_drawing,http://library.thinkquest.org/TQ0310106/isometricstep3.jpg

Oblique drawings are designed to show a person the 3d image of an object but it is not a 3d image. it is instead a 2d image which shows you clearly a side of the image but the rest of the image is distorted, hence making it look like a 3d picture.

Source:http://wiki.answers.com/Q/What_is_an_oblique_drawing,http://www.ider.herts.ac.uk/school/courseware/graphics/images/oblique.gif

Orthographic drawings are drawings that shows the shape and size of an object through a series of related 2d views.

Source:http://www.toolingu.com/definition-800130-35877-orthographic-drawing.html,http://www.tpub.com/steelworker1/14250_files/image052.jpg

Ho Jun Hui