Graphic techniques
3-D oblique
Oblique projection is a simple type of technical drawing of
graphical projection used for producing two-dimensional images of
three-dimensional objects. The objects are not in perspective, so they do not
correspond to any view of an object that can be obtained in practice, but the
technique does yield somewhat convincing and useful images.
Oblique projection is commonly used in technical drawing.
The cavalier projection was used by French military artists in the 18th century
to depict fortifications. Oblique projection was used almost universally by
Chinese artists from the first or second centuries to the 18th century,
especially when depicting rectilinear objects such as houses.
- v Oblique drawing is regarded as the most unskilful ‘3-D’ method but the easiest to master.
- v Oblique is not really a ‘3-D’ view but a two-dimensional vie of an object with ‘forced depth’.
- v When using the oblique method, the side of the object you are looking at is drawn in two dimensions, so that it is flat.
- v The other sides are drawn in at 45 degrees, but instead of drawing the sides’ full size they are only drawn with half the depth.
Types of
oblique
-
There are three types of oblique drawing: cavalier, general, and cabinet oblique. But we will only focus on the cabinet oblique drawing.v A cavalier drawing is used when you keep the depth at its full length.v A cabinet drawing is used when you cut the depth in half.v A general (or normal) drawing is used when you cut the depth to ¾ of the full depth.
- Steps in making the an oblique drawing
3-D
artistic drawing
- v All objects that we look at have perspectives.
- v Objects closer to us appear bigger than objects further away.
- v When objects get further away they seem to ‘vanish into the distance’. This is called a single vanishing point perspective.
- v Perspective drawing is a good method to use when drawing in 3-drawing.
Single
vanishing point perspective drawing
What is one point perspective drawing?
You grab a
pencil and begin sketching a stretch of railroad tracks. When you finish, you
feel as if you could step into your drawing and walk down the tracks until you
disappear. That's because your drawing has a great sense of perspective.
Drawing using one point perspective
Artists use perspective to create convincing representations
of our three-dimensional world on the two-dimensional surfaces of their
drawings. When perspective is used effectively, objects in a drawing appear to
recede into the distance, and they seem to exist in three-dimensional space.
Perspective is one of the foundations of realism in art.
One of the most important innovations in the history of
drawing was the development of linear perspective. Linear perspective is based
on a series of guidelines and points which help artists create a realistic
sense of depth in their drawings. There are several types of linear perspective
including one point perspective, two-point perspective, and three point
perspective.
One point perspective is based on the concept that the lines
and shapes in a drawing can be located in reference to a single line, called
the horizon line, and a single point called the vanishing point. The line is
called the horizon line because it often is placed where the actual horizon is
located in the drawing. It is also is called the eye level line because it
represents the viewer's eye level in relationship to the drawing.
The vanishing point is the point on the horizon line where
lines in the drawing that are actually parallel in real life, such as the two
rails of a railroad track, appear to merge when crossing the horizon line.
The vanishing point is located on the horizon line where the
two parallel rails appear to merge Image of Vanishing Point. Using the horizon
line and vanishing point as references, artists can create convincing drawings
of everything from simple cubes to complex architectural renderings.
Click here to view the Oblique Tutorial
Click here to view the Creation of an orthographic projection from an isometric view
Click here to view the Creation of an orthographic projection from an isometric view
