Lengthen an edge infinitely (a.k.a. vanishing point) I'm using Blender to make 2D perspective drawing materials for educational purposes. I'd like to demonstrate how the vanishing points change along with the camera angle. I know how to animate the camera, but to show the vanishing points of a cube I need to extend its edges to infinitely. 



How can I emulate this effect in Blender (preferably in EEVEE)?
Since your screen resolution is far from infinite, moving points far away will quickly reach the pixel size of your display. Starting with a 2m default cube, extruding an edge back 5000m should be plenty enough to simulate infinity and have them join at a subpixel level. Before doing this, don't forget to increase the Clip End limit of your viewport of camera.

Here is a simple way to do it in the view port: