Projection Theory and Methods in Drawing
Explore the concept of projection theory in creating 2D representations of 3D objects. Learn about the key parameters, types of projections, views, and classification methods used in drawing. Discover the importance of lines of sight, views, and different projection systems like first angle method and third angle system.
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Presentation Transcript
Projection Theory Projection is a method to represent 3D object into 2D plane(paper etc.) Object View Therefore we need at least two or three views (except for especial cases)
Projection Parameters The projection theory is based on 3 variables: 1- center sight point(station point) 2- Line of sight 3- Plane of projection Therefore View is the image on a projection plane
Lines of sight Lines of Parallel Projection Convergent Projection Play Play
Lines of sight The parallel projection lines can be normal (orthogonal) or oblique to the plane of projection. We consider only a parallel and orthogonal projection, i.e. orthographic projection. Orthogonal Oblique Play Play
Views View depends on a relative orientation between an object and a plane. Normal Rotation Tilting Multiview Drawing Axonometric Drawing
PROJECTION CLASSIFICATION Projections Convergent Parallel Orthogonal Oblique Multiview Axonometric Perspective Drawing Pictorial drawing Multiview drawing
PROJECTION METHOD Perspective Parallel Oblique Orthographic Axonometric Multiview
First angle method First -European countries - ISO standard quadrant Third angle method Opaque Planes - Canada, USA - Japan, Thailand Transparent Planes Third quadrant
First angle system (Opaque planes) Third angle system (transparent planes/glass box)
Third angle system First angle system Cutting Line Folding line Folding line Cutting Line
TOP VIEW First angle method FRONT VIEW LEFT SIDE VIEW FRONT VIEW LEFT SIDE VIEW Third angle method TOP VIEW
Third angle system First angle system 1.7d d 2.2d
