Isometrics, Perspective, and Oblique Drawing

Question 1

What is Isometric Drawing?

Answer 1

Came from the two words; Iso-equal and metrum- to measure. Consists of 3 axes, one of which is vertical and the other two drawn to the right and left angle of 30 degrees to the horizontal.

Question 2

What is Oblique Drawing?

Answer 2

It resembles an Isometric drawing except that one face is parallel to the plane of projection, and the front is similar to the view as it would appear in a multi-view drawing. Two axes of an oblique drawing are always at the right angles to each other and the third or cross-axis maybe at any angle to each other and the third or cross the horizontal planes, 30 or 45 degrees are generally used.

Question 3

What are the kinds of oblique drawing?

Answer 3

Cavalier and Cabinet

Question 4

What is Cavalier?

Answer 4

Receding lines are drawn at angle of 45 degrees and are measured in their dimensions.

Question 5

What is Cabinet?

Answer 5

Receding lines have been foreshortened one-half their actual size.

Question 6

What is Perspective Drawing?

Answer 6

Is a pictorial view seen by the observer’s eyes. It is the representation of an object as it appears to an observer stationed at a particular position relative to the object. It is an approximate representation.

Question 7

Anything we see is in fact a perspective view, true or false?

Answer 7

True

Question 8

What is plane?

Answer 8

An imaginary flat surface which has length and width but no thickness. It may extend indefinitely in any direction.

Question 9

What is Station Point (SP)?

Answer 9

Observer’s eye and not the point on the ground where the observer stands.

Question 10

What is Picture Plane (PP)?

Answer 10

An imaginary vertical plane where the perspective view is assumed or imagined to be projected or drawn.

Question 11

What is Horizon (H)?

Answer 11

The points where the figure appears horizontally at eye level.

Question 12

What is Horizon Line?

Answer 12

The intersection of the horizon plane and the eye level.

Question 13

What is Ground line?

Answer 13

The intersection of the ground plane with the picture plane.

Question 14

What is Eye level (EL)?

Answer 14

An imaginary horizontal plane which is in level with observer’s eye and the horizon.

Question 15

What is Axis of Vision?

Answer 15

Line through the station point that is perpendicular to the picture plane.

Question 16

What is Vanishing point (VP)?

Answer 16

The point where all lines seem to meet.

Question 17

What are the two Types of Perspective drawing?

Answer 17

Parallel or One-point Perspective and Angular Perspective.

Question 18

What is Parallel or One-point Perspective?

Answer 18

One of the principal surfaces of the object is drawn parallel to the picture plane. Has only one vanishing point which is usually located on the horizon or eye level and directly at the center of vision of the observer.

Question 19

What is Angular Perspective?

Answer 19

no surfaces of the object is parallel to the picture plane. It has two vanishing points usually located in the horizon or eye level.

Question 20

What are the various positions of Parallel and Angular perspectives?

Answer 20

Worm’s eye view, Man’s eye view, and Bird’s eye view.