7/30/2019 Elements of Perspective Drawing http://slidepdf.com/reader/full/elements-of-perspective-drawing 1/22 CIVIL ENGINEERING DRAWING & GRAPHICS CH (1+2) Lecture 4: Elements of perspective drawing Dr. Mohsin Siddique Asst. Prof. Dept. of Civil Engineering FAST-NU 12/09/2012
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• Isometric views: It is drawn by imagining the objects principalthree edges making equal angles with the plane of projection.
• Axonometric view: It is drawn to show the upper part in moredetails. The objects principal edges are imagined to be making 60o
on one side and 30o on other side with the horizontal plane.
• Oblique view: When one side of object is to be shown clearly, this view is used. The front object is kept parallel to the plane of projections and one edge is inclined at 30o-45o to the horizontal.
• Perspective view: It shows an object in its true shape as itappears to the eye.
• Picture Plane: The imaginary vertical plane between theobserver and the object on whichthe perspective is obtained isknow as picture plane. It isabbreviated as PP
• Ground Line: The line of
PERSPECTIVE PROJECTIONS
TECHNICAL TERMS
n ersec on o groun p ane an vertical or picture plane is calledground line and it is denoted by GL.
• Center of vision: The point
where the line of vision pierce thepicture plane is centre of vision.
• Horizon: Horizontal line drawnthrough center of vision on thepicture plane.
• When all set of parallel linesappear to converge at a single
point of convergence, theperspective is called one pointperspective.
• The set of horizontal and vertical lines of the object which are in the picture planeor parallel to it shows their trueheight and width in the front.
• The depth lines convergetowards a common vanishingpoint
• In this perspective, all the threesets of parallel lines converge at
three different vanishingpoints.
• This is mainly used for drawingperspective of very tall buildingor towers, since the vertical setof parallel line also appear toconverge at a vanishing point.