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July 17th, 2018, 06:43 AM  #1 
Newbie Joined: Jul 2018 From: earth Posts: 1 Thanks: 0  projecting a square on an equirectangular map
First time posting... let me know if this is the wrong place. So I am trying to program a 360 equirectangular image viewer, but I can't quite work out the math. The goal is to project a square (the screen's view) onto the equirectangular image to work out what each pixel of the screen would see. If something like this has already been posted, please link to it. Last edited by skipjack; July 22nd, 2018 at 07:08 AM. 
July 22nd, 2018, 04:50 AM  #2 
Math Team Joined: Jan 2015 From: Alabama Posts: 3,264 Thanks: 902 
An "equirectangular map" (also called a "Mercator map") is a mapping from a sphere onto a plane. So are you talking about a "square" on a sphere? Of course, it is impossible to have a true square on a sphere! Exactly what do you mean? Or do you mean the inverse map, from the plane to the sphere so that a square in a plane is being mapped to a sphere? Does this help? https://en.wikipedia.org/wiki/Equire...lar_projection 

Tags 
equirectangular, map, projecting, square 
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