Compare the differences and uniqueness between Isometric, Oblique, and Perspective views. Please explain why CAD becomes the most important and fundamental tool in modern design and Manufacturing as well as in product development. Solution Isometric views Oblique views Perspective views An isometric view represents an object in three dimensions with exact dimensional representation. Here the 3 sides of the object are drawn with all the vertical lines being vertically but all horizontal lines at 30 degree to the base line (x-axis line) All the three coordinate axes appear equally foreshortened and the angle between any two of them is 120 degrees In Isometric drawings, object are drawn with all its 3 planes parallel to projection planes and all the lines/edges are parallel to its respective foreshortened axes (30 degree axis) and can also be measured. All the lines/edges are drawn to the full length scale rather than reducing them to the true projection length. Oblique view also represents an object in the 3D format. But here the objects are drawn with the most distinguishing features facing directly towards the observer, showing the true shape of these features. E.g. Circular features like round holes are drawn on this front face as true circles. Oblique view will always show the object as being perfectly flat with respect to the picture plane (i.e., that particular face of the object will have only two dimensions from the viewer\'s point of view). Oblique view shows one face with distinguishing feature of the object in true shape, but the other faces with foreshorten depth. It is quite a simple technique compared to isometric or even perspective drawing as the only the face with distinguishing feature has to be drawn to the scale. Perspective views also represent an object in the 3D format with approximate representation. The lines/edges of an object seem to meet at a point over a distance. This point is called the vanishing point. Here the vertical lines remain vertical, horizontal lines remain horizontal but the line that represents the depth of the object (3rd Dimension lines) are drawn converging on to this vanishing point. The depth lines are to be drawn from the vanishing point to the sides of the drawing paper as guide lines. Objects in a perspective drawing all the lines/edges are subject to foreshortening. The size of the object is drawn smaller as their distance from the observer increases. As their distance from the observer decreases they are drawn larger. Isometric views Oblique views Perspective views An isometric view represents an object in three dimensions with exact dimensional representation. Here the 3 sides of the object are drawn with all the vertical lines being vertically but all horizontal lines at 30 degree to the base line (x-axis line) All the three coordinate axes appear equally foreshortened and the angle between any two of them is 120 degrees In Isometric drawings, object are drawn with all its 3 planes parallel.

1. Compare the differences and uniqueness between Isometric, Oblique, and Perspective views.
Please explain why CAD becomes the most important and fundamental tool in modern design
and Manufacturing as well as in product development.
Solution
Isometric views
Oblique views
Perspective views
An isometric view represents an object in three dimensions with exact dimensional
representation.
Here the 3 sides of the object are drawn with all the vertical lines being vertically but all
horizontal lines at 30 degree to the base line (x-axis line)
All the three coordinate axes appear equally foreshortened and the angle between any two of
them is 120 degrees
In Isometric drawings, object are drawn with all its 3 planes parallel to projection planes and all
the lines/edges are parallel to its respective foreshortened axes (30 degree axis) and can also be
measured.
All the lines/edges are drawn to the full length scale rather than reducing them to the true
projection length.
Oblique view also represents an object in the 3D format.
But here the objects are drawn with the most distinguishing features facing directly towards the
observer, showing the true shape of these features. E.g. Circular features like round holes are
drawn on this front face as true circles.
Oblique view will always show the object as being perfectly flat with respect to the picture plane
(i.e., that particular face of the object will have only two dimensions from the viewer's point of
view).
Oblique view shows one face with distinguishing feature of the object in true shape, but the other
faces with foreshorten depth.
It is quite a simple technique compared to isometric or even perspective drawing as the only the
face with distinguishing feature has to be drawn to the scale.
Perspective views also represent an object in the 3D format with approximate representation.
The lines/edges of an object seem to meet at a point over a distance. This point is called the
vanishing point.
Here the vertical lines remain vertical, horizontal lines remain horizontal but the line that
represents the depth of the object (3rd Dimension lines) are drawn converging on to this

2. vanishing point.
The depth lines are to be drawn from the vanishing point to the sides of the drawing paper as
guide lines.
Objects in a perspective drawing all the lines/edges are subject to foreshortening. The size of the
object is drawn smaller as their distance from the observer increases. As their distance from the
observer decreases they are drawn larger.
Isometric views
Oblique views
Perspective views
An isometric view represents an object in three dimensions with exact dimensional
representation.
Here the 3 sides of the object are drawn with all the vertical lines being vertically but all
horizontal lines at 30 degree to the base line (x-axis line)
All the three coordinate axes appear equally foreshortened and the angle between any two of
them is 120 degrees
In Isometric drawings, object are drawn with all its 3 planes parallel to projection planes and all
the lines/edges are parallel to its respective foreshortened axes (30 degree axis) and can also be
measured.
All the lines/edges are drawn to the full length scale rather than reducing them to the true
projection length.
Oblique view also represents an object in the 3D format.
But here the objects are drawn with the most distinguishing features facing directly towards the
observer, showing the true shape of these features. E.g. Circular features like round holes are
drawn on this front face as true circles.
Oblique view will always show the object as being perfectly flat with respect to the picture
plane (i.e., that particular face of the object will have only two dimensions from the viewer's
point of view).
Oblique view shows one face with distinguishing feature of the object in true shape, but the
other faces with foreshorten depth.
It is quite a simple technique compared to isometric or even perspective drawing as the only the
face with distinguishing feature has to be drawn to the scale.
Perspective views also represent an object in the 3D format with approximate representation.
The lines/edges of an object seem to meet at a point over a distance. This point is called the
vanishing point.
Here the vertical lines remain vertical, horizontal lines remain horizontal but the line that
represents the depth of the object (3rd Dimension lines) are drawn converging on to this

3. vanishing point.
The depth lines are to be drawn from the vanishing point to the sides of the drawing paper as
guide lines.
Objects in a perspective drawing all the lines/edges are subject to foreshortening. The size of the
object is drawn smaller as their distance from the observer increases. As their distance from the
observer decreases they are drawn larger.