- From: fuchsia via GitHub <sysbot+gh@w3.org>
- Date: Fri, 01 Jun 2018 14:10:19 +0000
- To: public-fxtf-archive@w3.org
Calling `w` "the perspective" is very confusing, though. As far as I can see, `w` is just a regular coordinate in ℝ<sup>4</sup> and DOMPoints are just four-component vectors (I could store RGBA values in them, if I wanted). And they should be labelled as such - something like: > The x, y, z and w coordinates represent an arbitrary point in a four-dimensional space. By convention, they are treated as a homogeneous representation of points in ℙℝ<sup>3</sup> with the Euclidean space embedded at w=1, and the x, y and z coordinates giving the normal three-dimensional position. AKA It's awfully convenient to do 3D maths in 4D with the fourth coordinate set to 1. -- GitHub Notification of comment by fuchsia Please view or discuss this issue at https://github.com/w3c/fxtf-drafts/issues/276#issuecomment-393892559 using your GitHub account
Received on Friday, 1 June 2018 14:10:22 UTC