There was a similar question asked on this same site a few years ago (How to transform a set of 3D vectors into a 2D plane, from a view point of another 3D vector?), but the answerer seemed to kind of jump into hard-to-follow math steps without an adequate explanation as to why he did what he did. I know I could have left a comment, but given the age of the answer, he may not be interested in posting a reply.
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1At the very least, provide a link to the other question that you're referring to. And please be more specific in your question, the title is very broad – mrf Sep 01 '15 at 21:06
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I have kind of an idea:
Imagine you're lying down and looking at a box whose inside you can see from the outside. Also, imagine that this box is angled somewhat. You and the box are parallel to the ground. You pick an edge - called point A - and to an observer who can only see in two dimensions, the edge's location on a coordinate plane is the location of a point - which we'll call B - that you, the 3D observer, know is a point from which someone looking at the top of the box and who is also angled parallel to the ground can draw a line that connects to the edge.
The trick, then, is to find point B. And that's the point that the computer displays on screen.
moonman239
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