# projection

A projection is a transformation in which the **image
figure** is obtained from the original figure (plane or three-dimensional)
by drawing from the point of the original figure straight lines, which are
either parallel (**parallel projection**), or concurrent (**central
projection**), and which intersect the **image plane**.
The points of intersection of the straight lines (rays of projection) with
the image plane are the **image points**, the totality of which
yields the image figure. The figure is said to be projected onto the image
plane. See also projective geometry.