Orthogonal line
DEFINITION
A straight line imagined to be behind and perpendicular to the picture plane. The orthagonals in a painting appear to converge on each other as they recede toward one or more vanishing points on the horizon.Also see linear perspective.<br><br>A straight line imagined to be behind and perpendicular to the picture plane. The orthagonals in a painting appear to converge on each other as they recede toward one or more vanishing points on the horizon.Also see linear perspective.