الرسم المتقايس المجسم Isometric

Lecture 01

Types of Projection:
1. Pictorial Projection
2. Orthographic Projection
Pictorial Projection:
1. Isometric Projection
2. Oblique Projection
3. Perspective Projection

1. Isometric Projection:
"Iso" means equal and "metric projection" means projection to a reduced measure. The tilting angle of the view is 30o to the horizontal.

Isometric Drawing:
The principles of isometric projection enable the three dimensions of a solid to be shown by one drawing, which, in appearance, is somewhat similar to a perspective representation, with the additional advantage that the actual sizes of the solid can be measured direct from the drawing.
It has been said, in referring to the drawing of the cube Fig. 1, that with oblong solids all lines are parallel to one of the three lines OA, OB, and OC. These lines are termed the “ISOMETRIC AXES,” and it is necessary in commencing any isometric projection to first set out these three lines.

Methods of Isometric Drawing:
1. Box method
The isometric projections of prisms, squares and cylinders are generally drawn by the Box method.
2. Co-ordinate or offset method
The isometric projections of pyramids and cones are generally drawn by Co - ordinate or offset method.