Perspective drawing calculation
January 8, 2013 7:31 PM Subscribe
If I want to draw something in one-point perspective, say, like a set of railroad tracks where the vanishing point is on the horizon, and the tracks are represented on the picture plane by an equilateral triangle (they appear that way to the viewer), the apex of the triangle being the vanishing point on the horizon and the base of the triangle is where the tracks meet the picture plane, how do I calculate where the railroad ties would be? (Given that in 3D they are evenly spaced. Also, I'm not really concerned with the thickness of the ties -- we can consider the ties to simply be horizontal lines.)
posted by strangeguitars to Science & Nature (5 answers total) 3 users marked this as a favorite
Note: I want to do this mathematically, not by eye. I would like to be able to formulate where the "ties" meet the sides (or alternatively where they cross the middle (the height of the equilateral triangle on the picture plane)).