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
Eleven Magazine announce the winner and runners-up in their Moontopia competition.
As January is the time for hitting the gym, Designing Buildings Wiki lists the best gym architecture in the world.
London is at the top of the list of global construction megacities, beating Dubai and Abu Dhabi.
What are the innovative business models of the future, and how to incentivise supply chains to work on a whole life basis?
One of the largest churches in the world, the monumental St. Peter's Basilica.
How thermal comfort is quantified and how it can affect wellbeing.
Snøhetta complete a treehouse cabin that allows guests to lie beneath the Northern Lights.
Christiania is an anarchist 'freetown' in Copenhagen where strange and experimental architecture has flourished.
“UK waste data needs improving” say BRE specialists, in this summary of their report into construction waste.
UandI announce new joint venture with US developer to work on office refurbishment projects.
Why buildings crack, how cracks are categorised and what can be done.