A projection plane, or plane of projection, is a type of view in which graphical projections from an object intersect.
[Gary R. Bertoline et al. (2002) ''Technical Graphics Communication''. McGraw–Hill Professional, 2002. , p. 330.] Projection planes are used often in
descriptive geometry
Descriptive geometry is the branch of geometry which allows the representation of three-dimensional objects in two dimensions by using a specific set of procedures. The resulting techniques are important for engineering, architecture, design and ...
and graphical representation. A
picture plane
In painting, photography, graphical perspective and descriptive geometry, a picture plane is an image plane located between the "eye point" (or '' oculus'') and the object being viewed and is usually coextensive to the material surface of the w ...
in
perspective drawing
Linear or point-projection perspective (from la, perspicere 'to see through') is one of two types of 3D projection, graphical projection perspective in the graphic arts; the other is parallel projection. Linear perspective is an approximate r ...
is a type of projection plane.
With perspective drawing, the lines of sight, or projection lines, between an object and a picture plane return to a
vanishing point
A vanishing point is a point on the image plane of a perspective drawing where the two-dimensional perspective projections of mutually parallel lines in three-dimensional space appear to converge. When the set of parallel lines is perpendicul ...
and are not parallel. With
parallel projection
In three-dimensional geometry, a parallel projection (or axonometric projection) is a projection of an object in three-dimensional space onto a fixed plane, known as the ''projection plane'' or '' image plane'', where the ''rays'', known as '' li ...
the lines of sight from the object to the projection plane are parallel.
File:Perspective projection of triangle ABC on plane Π from point S.svg , Perspective projection of triangle ABC on plane Π from point S.
File:Axonometric_projection.svg , Axonometric projection on projection plane Π
File:Perspectiva-1.svg , A cube in two-point perspective
File:Perspectiva-2.svg , Simulated rays of light travel from the object, through the projection plane, and to the viewer's eye or camera. This is the basis for graphical perspective.
File:Various projections of cube above plane.svg , Various graphical projections and how they are produced
See also
*
Image plane
In 3D computer graphics, the image plane is that plane in the world which is identified with the plane of the display monitor used to view the image that is being rendered. It is also referred to as screen space. If one makes the analogy of taking ...
*
Picture plane
In painting, photography, graphical perspective and descriptive geometry, a picture plane is an image plane located between the "eye point" (or '' oculus'') and the object being viewed and is usually coextensive to the material surface of the w ...
References
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Graphical projections