DRAWING AND PAINT

Find a Centre Of The Square Or A Rectangle In Perspective

It's a very simple process, using diagonals to locate the center of a square or rectangle in perspective. From there, you can use this point to divide the shape into half or four, or use the center points to place the vertex of a roofline or column. Works in one or two point perspective.

( Source by -http://drawsketch.about.com/od/perspective/ss/perspectivediv.htm )