anything in math or geometry that can be used to checkif/define the line on 2d plane(paper) does represent the line in the 3d space with its relative, focal length, depth of view and so on?

or basically converting/projecting a 3d line/form into 2d plane correctly?

or maybe just creating an image based on 3d form and certain position, size, direction/angle, focal length and fov and so on