the projection lines converge at the vanishing point in a perspective sketch.
the projection lines converge at the vanishing point in a perspective sketch.
where do the projection lines converge in a perspective sketch?
vanishing point
the basic categorization of artificial perspective is by the number of vanishing points:









































bullet::::- one-point perspective where objects facing the viewer are orthogonal, and receding lines converge to a single vanishing point.









































bullet::::- two-point perspective reduces distortion by viewing objects at an angle, with all the horizontal lines receding to one of two vanishing points, both located on the horizon.









































bullet::::- three-point perspective introduces additional realism by making the verticals recede to a third vanishing point, which is above or below depending upon whether the view is seen from above or below.
architectural drawing
orthographic projection









































orthographic projection (sometimes orthogonal 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.
orthographic projection