First, you have to understand those different drawing approaches. It can help you to communicate with client or suppliers.
Orthographic projections are a way of describing what an object looks like from several different views.
Orthographics are also called engineering drawings or plan views.
When drawing orthographic drawings, the observer present a 3D image in two dimensions, and you will generally produce three views. A plan view, end elevation and a front elevation.
- The plan view is the view of objects when we look directing down on the top of the objects
- End elevation is either or sometimes both the remaining side views.
- Front elevation is the view when we look straight on the front of the objects.
Cutaway=> According to Diepstraten et al. (2003) "the purpose of a cutaway drawing is to allow the viewer to have a look into an otherwise solid opaque object.
Isometric => To create 2D drawings that represent 3D objects, such as cubes.
Isometric drawings are not true 3D drawings. They simulate a 3D object from a particular viewpoint by aligning along three major axes.
Unlike perspective drawing, lines in Isometric or Axonometric drawings do not converge. In fact they only go in 3 different directions. Vertical and 30 degrees left and right in Isometric Projections, vertical and 45 degrees left and right in Axonometric projections.
Often, Axonometric projections may appear to be distorted but they are very useful to show as much as possible of, for example, the inside of a room.
Perspective=> the principles are quite straightforward.
In 1 point perspective drawing, lines converge towards one vanishing point.
In 2 points perspective drawing, lines converge towards two vanishing points.
In 3 points perspective drawing, lines converge towards three vanishing points.
Perspective- a technique of depicting volumes and spatial relationships on a flat surface.
Horizon Line- A level horizontal line located at eye level.
Vanishing Point- A point of convergence of parallel lines located on the Horizon Line.
Scale- The apparent size of an object.
The horizon line, also known as eye level, is an imaginary plane passing through the eyes of the viewer when looking straight ahead. Therefore, a perspective drawing of the same object/scene will be different depending on the position of the eye level/horizon.
An exploded view drawing shows the intended assembly of mechanical or other parts and demonstrate how they fit together.
It shows the components of an object slightly separated by distance, or suspended in surrounding space in the case of a three-dimensional exploded diagram.
Detail drawing => A detail drawing shows a single component or part.
Section view=>To produce a sectional view, an imaginary plane, called the cutting plane, cuts through the object and the two halves are separated to expose the interior construction.
The direction of sight may be toward the right or left half