Upload
razi-baig
View
654
Download
22
Embed Size (px)
Citation preview
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 EngineeringFAST-NU
12/09/2012
7/30/2019 Elements of Perspective Drawing
http://slidepdf.com/reader/full/elements-of-perspective-drawing 2/22
ISOMETRIC AND PERSPECTIVE VIEWS
BASICS
• Isometric or perspective views are of great importance toarchitect, draftsman, town planners and engineers as these help
them in conveying their perceived objects to the laymen andunskilled workers before construction of the project.
• T es of three dimensional views
▫ (1). Isometric Projection▫ (2). Axonometric Projection
▫ (3). Oblique Projection
▫ (4). Perspective Projection
7/30/2019 Elements of Perspective Drawing
http://slidepdf.com/reader/full/elements-of-perspective-drawing 3/22
ISOMETRIC AND PERSPECTIVE VIEWS
BASICS
• 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.
7/30/2019 Elements of Perspective Drawing
http://slidepdf.com/reader/full/elements-of-perspective-drawing 4/22
PERSPECTIVE PROJECTIONS
BASICS
7/30/2019 Elements of Perspective Drawing
http://slidepdf.com/reader/full/elements-of-perspective-drawing 5/22
PERSPECTIVE PROJECTIONS
• Perspective view orprojection gives theappearance of an object as itappears to the human eye.
• It is similar to photographicpicture.
• In a perspective projection all theprojectors appear to meet at apoint e.g., if an observed stand inthe railway track, the railway
lines appear to meet at a point.
• If such a view is drawn with thehelp of drawing instrument on aplane, it is know as perspective
projection.
7/30/2019 Elements of Perspective Drawing
http://slidepdf.com/reader/full/elements-of-perspective-drawing 6/22
PERSPECTIVE PROJECTIONS
7/30/2019 Elements of Perspective Drawing
http://slidepdf.com/reader/full/elements-of-perspective-drawing 7/22
PERSPECTIVE PROJECTIONS
7/30/2019 Elements of Perspective Drawing
http://slidepdf.com/reader/full/elements-of-perspective-drawing 8/22
• 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.
7/30/2019 Elements of Perspective Drawing
http://slidepdf.com/reader/full/elements-of-perspective-drawing 9/22
PERSPECTIVE PROJECTIONS
TECHNICAL TERMS
• Station Point: It is the point of sight where all projector converge• Vanishing Point: It is a point on the picture plane where all the
parallel lines appear to converge.
7/30/2019 Elements of Perspective Drawing
http://slidepdf.com/reader/full/elements-of-perspective-drawing 10/22
PERSPECTIVE PROJECTIONS
TECHNICAL TERMS• Angle of vision: Draw the plan of the object. Join the station point
with two extreme corners of the object. These two extreme corner
lines enclose the Arc of Vision. The angle formed between theselines is known as angle of vision.
7/30/2019 Elements of Perspective Drawing
http://slidepdf.com/reader/full/elements-of-perspective-drawing 11/22
PERSPECTIVE PROJECTIONS
TECHNICAL TERMS• Measuring line: The intersection of the plan of the object with
picture plane gives the true height at the point of intersection, when
measured in elevation. So any side of the object which lies in pictureplane shows the true height of the object.
• Eye level: It is a line at the eye-level of the observer and isrepresented by straight line. Its true height is observed from ground
.
7/30/2019 Elements of Perspective Drawing
http://slidepdf.com/reader/full/elements-of-perspective-drawing 12/22
CLASSIFICATION OR PERSPECTIVE
• Shadow Perspective or Pictorials and
• Linear Perspective
▫ One-point perspective
▫ Two Point perspective▫ Three point perspective
7/30/2019 Elements of Perspective Drawing
http://slidepdf.com/reader/full/elements-of-perspective-drawing 13/22
ONE POINT PERSPECTIVE
• 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
7/30/2019 Elements of Perspective Drawing
http://slidepdf.com/reader/full/elements-of-perspective-drawing 14/22
Can you locate theHorizon Line?
How did you
ONE POINT PERSPECTIVE
Can you find the
vanishing point in this
picture?
7/30/2019 Elements of Perspective Drawing
http://slidepdf.com/reader/full/elements-of-perspective-drawing 15/22
The red line is the Horizon Line.
ONE POINONE POINT PERSPECTIVET
7/30/2019 Elements of Perspective Drawing
http://slidepdf.com/reader/full/elements-of-perspective-drawing 16/22
Can you locate the vanishing point?
ONE POINT PERSPECTIVE
7/30/2019 Elements of Perspective Drawing
http://slidepdf.com/reader/full/elements-of-perspective-drawing 17/22
TWO POINT PERSPECTIVE
• Face of the object is keptinclined to the picture plane
while drawing it.
• There are two vanishing points:one on the left and other on the
.
• This perspective is used for buildings and otherengineering assemblies.
• It shows more than one face of building and thus makes thistype of perspective moreillustrative.
7/30/2019 Elements of Perspective Drawing
http://slidepdf.com/reader/full/elements-of-perspective-drawing 18/22
Locate VanishingPoint
TWO POINT PERSPECTIVE
7/30/2019 Elements of Perspective Drawing
http://slidepdf.com/reader/full/elements-of-perspective-drawing 19/22
Objects seen at an angle would be drawn with two-pointperspective using two vanishing points.
TWO POINT PERSPECTIVE
7/30/2019 Elements of Perspective Drawing
http://slidepdf.com/reader/full/elements-of-perspective-drawing 20/22
THREE POINT PERSPECTIVE
• 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.
7/30/2019 Elements of Perspective Drawing
http://slidepdf.com/reader/full/elements-of-perspective-drawing 21/22
REFERENCES
• A course in Civil Engineering Drawing• By V.B Sikka
•
7/30/2019 Elements of Perspective Drawing
http://slidepdf.com/reader/full/elements-of-perspective-drawing 22/22
THANK YOU
• Questions….
• Comments…
• Suggestions…
• Feel free to contact: