Re: Surface Normal
- To: mathgroup at smc.vnet.net
- Subject: [mg55193] Re: Surface Normal
- From: "Carl K. Woll" <carlw at u.washington.edu>
- Date: Wed, 16 Mar 2005 05:36:15 -0500 (EST)
- Organization: University of Washington
- References: <d15s2g$9k2$1@smc.vnet.net>
- Sender: owner-wri-mathgroup at wolfram.com
<gouqizi.lvcha at gmail.com> wrote in message news:d15s2g$9k2$1 at smc.vnet.net... > Hi, All: > > If I have a surface in parametric form > > For example, > x = (10 + 5cosv)cosu > y = (10 + 5cosv)sinu > z = 5sinv > > How can I quickly calculate its normal for any (u,v) by mathematica > > Rick > Rick, What about the following Cross[ D[ {x,y,z}, u], D[ {x,y,z}, v] ] Carl Woll