Re: Require derivation for the intersection of three planes
- To: mathgroup at smc.vnet.net
- Subject: [mg31095] Re: Require derivation for the intersection of three planes
- From: gah at math.umd.edu (Garry Helzer)
- Date: Tue, 9 Oct 2001 01:55:49 -0400 (EDT)
- Organization: University of Maryland
- References: <9pp17q$88p$1@smc.vnet.net>
- Sender: owner-wri-mathgroup at wolfram.com
A zero denominator indicates that the three normal vectors lie in a common
plane and hence that the three planes intersect not in a single point but
along an entire line (at least).
In article <9pp17q$88p$1 at smc.vnet.net>, Kiran Aware <awarekh at email.uc.edu>
wrote:
>
> r = {D1 ( U2 Cross U3) + D2 (U3 Cross U1) + D3(U1 Cross U2)} / U1 dot ( U2
> Cross U3)
>
> Also i am unable to explain the geometric meaning of a Zero denominator in
> the above equation