# Projection drawing

## Projection drawing

The process or technique of representing a three-dimensional object by projecting all its points by straight lines, either parallel or converging to a picture plane.

### axonometric projection

The orthographic projection of a three-dimensional object inclined to the picture plane in such a way that its three principal axes can be drawn to scale but diagonal and curved lines appear distorted.

### cutaway

A drawing or model having an outer section removed to display the interior space.

### diametric projection

An axonometric projection of a three-dimensional object to the picture plane in such a way that two of its principal axes are equally foreshortened, and the third appears longer or shorter than the other two.

### exploded view

A drawing that shows the individual parts of a structure or construction separately, but indicates their proper relationship to each other and to the whole.

### isometric projection

An axonometric projection of a three-dimensional object is created by having its principal faces equally inclined to the picture plane; so that its three principal axes are all equally foreshortened.

### longitudinal section

An orthographic projection of a section made by cutting through the longest axis of an object.

### oblique projection

A method of projection in which a three-dimensional object, having one principal face parallel to the picture plane, is represented by projecting parallel lines at some angle other than 90 degrees.

### oblique section

An orthographic projection of a section made by cutting with a plane that is neither parallel nor perpendicular to the long axis of an object.

### orthographic projection

A method of projection in which a three-dimensional object is represented by projecting lines perpendicular to a picture plane.

### paraline drawing

Any of various single-view drawings characterized by parallel lines remaining parallel to each other rather than converging as in linear perspective.

### section

An orthographic projection of an object or structure as it will appear if cut through by an intersecting plane to expose its internal configuration.

### transverse section

An orthographic projection of a section made by cutting through an object along the shortest axis.

### trimetric projection

An axonometric projection of a three-dimensional object inclined to the picture plane in such a way that all three principal axes are foreshortened at a different rate.

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