POV-Ray : Newsgroups : povray.beta-test : <1, 0, 0> + 1*t : Re: <1, 0, 0> + 1*t Server Time
16 Aug 2022 05:48:21 EDT (-0400)
  Re: <1, 0, 0> + 1*t  
From: Mike Williams
Date: 22 Jan 2002 13:45:48
Message: <rvLt0DAqXUT8Ew35@econym.demon.co.uk>
Wasn't it mm who wrote:

>I find the present state annoying not so much because 1*t and t*1 are
>distinct

1*t and t*1 do evaluate to the same thing, <0,0,0,1>.

It's A+1*t and A+t*1 that evaluate differently (where A is a 2d or 3d
vector).


Perhaps more worrying is that  A+1*z  is different from  A+z*1  (where A
is a 2d vector) even though 1*z = z*1 = <0,0,1>.

-- 
Mike Williams
Gentleman of Leisure


Post a reply to this message

Copyright 2003-2021 Persistence of Vision Raytracer Pty. Ltd.