<P> A vanishing point is a point on the image plane of a perspective drawing where the two - dimensional perspective projections (or drawings) of mutually parallel lines in three - dimensional space appear to converge . When the set of parallel lines is perpendicular to a picture plane, the construction is known as one - point perspective, and their vanishing point corresponds to the oculus, or "eye point", from which the image should be viewed for correct perspective geometry . Traditional linear drawings use objects with one to three sets of parallels, defining one to three vanishing points . </P> <Table> <Tr> <Td> Part of a series on </Td> </Tr> <Tr> <Th> Graphical projection </Th> </Tr> <Tr> <Td> </Td> </Tr> <Tr> <Td> Planar (show) <Ul> <Li> Parallel projection <Ul> <Li> Orthographic projection <Ul> <Li> Multiview projection </Li> <Li> Axonometric projection <Ul> <Li> Isometric projection </Li> </Ul> </Li> </Ul> </Li> <Li> Oblique projection </Li> </Ul> </Li> <Li> Perspective projection <Ul> <Li> Curvilinear perspective </Li> <Li> Reverse perspective </Li> </Ul> </Li> </Ul> </Td> </Tr> <Tr> <Td> Views (show) <Ul> <Li> 2.5 D </Li> <Li> Bird's - eye view </Li> <Li> Cross section </Li> <Li> Cutaway drawing </Li> <Li> Exploded view drawing </Li> <Li> Fisheye lens </Li> <Li> Panorama </Li> <Li> Worm's - eye view </Li> <Li> Zoom lens </Li> </Ul> </Td> </Tr> <Tr> <Td> Topics (show) <Ul> <Li> 3D projection </Li> <Li> Anamorphosis </Li> <Li> Axonometry </Li> <Li> Computer graphics </Li> <Li> Computer - aided design </Li> <Li> Descriptive geometry </Li> <Li> Engineering drawing </Li> <Li> Map projection </Li> <Li> Picture plane </Li> <Li> Plans (drawings) </Li> <Li> Projection (linear algebra) </Li> <Li> Projection plane </Li> <Li> Projective geometry </Li> <Li> Stereoscopy </Li> <Li> Technical drawing </Li> <Li> Vanishing point </Li> <Li> Video game graphics </Li> <Li> Viewing frustum </Li> </Ul> </Td> </Tr> <Tr> <Td> <Ul> <Li> </Li> <Li> </Li> <Li> </Li> </Ul> </Td> </Tr> </Table>

Where do the projection lines converge in a perspective sketch