POV-Ray : Newsgroups : povray.advanced-users : Extract 2D screen coordinates from 3D : Re: Extract 2D screen coordinates from 3D Server Time
25 Sep 2021 14:42:11 EDT (-0400)
  Re: Extract 2D screen coordinates from 3D  
From: Melody
Date: 18 Jan 2020 21:00:00
Message: <web.5e23b7cfc5d107b39da690110@news.povray.org>
i see trouble with that original code when I was first out ...

if you grok 3D math its ALWAYS normalize a vcross() that's the crossProduct.

even 2 normals with a length of 1 != length of 1

vlen(crossprod(normalize(3,5,8),normalize(7,4,6))) = 0.4469


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