Theories and Principle of Orthographic Projection

Theories and Principle of Orthographic Projection

By Jonalyn Rosario

Orthographic Projection

“Orthographic projection is a means of representing three-dimensional objects in two dimensions. It is a form of parallel projection, in which all the projection lines are orthogonal to the projection plane, resulting in every plane of the scene appearing in affine transformation on the viewing surface. The obverse of an orthographic projection is an oblique projection, which is a parallel projection in which the projection lines are not orthogonal to the projection plane.”

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THEORIES AND PRINCIPLES OF ORTHOGRAPHIC PROJECTION

Multi-view drawing – a drawing that shows more than one view of an object.

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Orthographic Projection – A system for graphical representation of an object by a line drawing on a flat surface.

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Orthographic View – a drawing that shows a side of an object viewed directly from 90 degrees.

Subject | Subject

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Six (6) Principal Views of an Object:

The simple work piece below shows the six (6) principal sides or views.

An orthographic view is made by projecting the edge of the object perpendicular to a plane of projection.

Planes of Projection

Three planes of projection are used in orthographic drawing. These are called the horizontal plane, frontal plane, and the profile plane.

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The planes of projection join and form quadrants. The quadrants are called first angle, second angle, third angle, and fourth angle. The first and the third quadrants are used for drafting purposes.

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Overall Size of the Object

1. Height is the perpendicular distance between two horizontal planes.

2. Width is the perpendicular distance between two profile planes.

3. Depth is the perpendicular distance between two frontal planes

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Evaluation 1:

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Fill in the Blanks Directions: Supply the correct information on each blank.

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Fill in the Blanks

1. The perpendicular distance between frontal planes is called

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2. The perpendicular distance between profile planes is called

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3. The perpendicular distance between horizontal plane is referred to as

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Multiple Choice

The three planes of projection that are used in orthographic drawing are the horizontal plane, frontal plane, and the profile plane.

• TRUE

• FALSE

Poll

An orthographic view is made by projecting the edge of the object perpendicular to a plane of projection

• TRUE

• FALSE

Multiple Choice

Multi-view drawing – a drawing that shows more than one view of an object

• TRUE

• FALSE

Multiple Choice

“____________ is a means of representing three-dimensional objects in two dimensions. It is a form of parallel projection, in which all the projection lines are orthogonal to the projection plane, resulting in every plane of the scene appearing in affine transformation on the viewing surface.

• Multi-view drawing

• Orthographic View

• Orthographic projection

• Planes of Projection