There are a number of techniques of projection that can be used to represent three-dimensional objects in two-dimensions by 'projecting' their image onto a planar surface.
Drawing projections should comply with relevant standards (such as British Standards) to prevent misunderstanding and avoid errors in interpreting the drawing.
 Orthographic projection
Orthographic projection is a type of 'parallel' projection in which the four orthogonal views of an object are shown. The orthographic projection commonly used in the UK is called first angle projection.
Axonometric projection creates a true plan set at 45 degrees, which retains the original orthogonal geometry of the plan. It is particularly suitable for representing interior designs, such as kitchen layouts. Planning drawings can also be effective represented as axonometric projections, showing the relationships between buildings and topography.
The axonometric method became increasingly popular in the 20th century as a formal presentation technique, but recently has become less widely used due to the emergence of CAD programmes and building information modelling.
 Isometric projection
The isometric was the standard view until the mid-20th century. Unlike the axonometric projection, the isometric plan view is slightly distorted, using a plan grid at 30 degrees from the horizontal in both directions. It can be used to show the nature of the design and explain construction details more clearly than an orthographic projection. It is sometimes used during concept design to help the client grasp the mass of the proposal.
 Oblique projection
When primary information is drawn in elevation, the interpretation can be enhanced by an oblique projection. This is a simple method of producing two-dimensional images of three-dimensional objects. The differentiating characteristic of oblique projection is that the drawn objects are not in perspective, and so do not correspond to any actual obtainable view.
 Related articles on Designing Buildings Wiki
- Architectural reprography.
- As-built drawings and record drawings.
- Assembly drawing.
- Augmented reality in construction.
- Bill of quantities.
- Building information modelling.
- Component drawing.
- Computer aided design.
- Concept drawing.
- Detail drawing.
- Engineering drawing.
- General arrangement drawing.
- Installation drawings.
- Manual drafting techniques.
- North American Paper Sizes
- Notation and symbols.
- Paper sizes (ISO 216 A, B and C series)
- Production information.
- Section drawing.
- Shop drawings.
- Site plan.
- Technical drawing.
- Types of drawings.
- Working drawing.
Featured articles and news
Watch one of the first documentaries by the acclaimed Adam Curtis, examining the substandard system building of the 1960s.
Take a look at the tech start-up that could transform construction design and communication.
This house in Barcelona uses an innovative new facade tiling system to blend into the landscape.
The origins, evolution and future of Level 3 BIM.
For new and returning Urban Design students, check out our article list divided up into the modules you'll be studying.
Report states that health of urban dwellers could be significantly improved by rethinking transport design.
The Kremlin, the centre of Russian power, includes some of the country's finest architecture.
Report launched outlining steps for a national infrastructure system that is efficient, sustainable, and delivers until 2050.
A review of Justin Bere's concise and well-presented introductory guide to Passive House.
This article describes in detail the tender process for a typical commercial construction contract.
'The filing cabinet' which was labelled one of the best British buildings of the 21st century.