Short Answer 3 points each 1 What is the principle differenc

Short Answer (3 points each) 1. What is the principle difference between the projections that we\'ve been learning about in class (multiview, isometric, oblique) and a perspective projection? 2. The following line has been drawn with a scale of 1\" = .5. what is the real length of this line? 0 2 4 6 8 10 2 14 16 18 20 22 242 50 What is the difference between isometric, dimetric, and trimetric projections? Describe in as much detail as possible 3. 4. Name one angle that can be used for the receding axis of an oblique projection. 3 5 9 0

Solution

Solution:-

(1)Answer:- Difference between multiview ,isometric, oblique and perspective projection :-

Multiview projection:- A mutiview projection is technique by which a orthographic two dimensional pictures is constructed to represent the form of three dimentional object.

Isometric Projection:- A representation of an object in which all three dimensions are drawn at full scale rather than fore shortening them to true projection. Isometric drawing looks as isometric projection but all lines parallel to three major axis are measurable.

Oblique Projection :- It is designed to show three dimensional view of object. It shows one face of object in true shape and other faces on a distorted angle. Oblique is not really a three D system but a 2 D view of an object with forced depth.

Perspective projection:- It is a type of drawing that graphically made on 2 dimensional surface the images of three dimensional object so as to approximate actual visual perception.

(2) Solution:-

Scale

1” = 0.5’

Length of draw line = 20.25”

Actual length of line = 20.25” * 0.5

                         = 10.125’ Answer

(3) Answer:-Difference between isometric diametric and trimetric projection:-

Isometric projection:- In isometric the three axes of space appear equally foreshortened and there is a common angle 120 degree between them.

Diametric projection:- In this projection two of three axes spaces appear equally foreshortened.

Trimetric projection:- In this projection all three axes of spaces appear unequally foreshortened.

(4) Answer:- 45 degree is used in oblique projection.