Path: chuka.playstation.co.uk!news From: sosman@terratron.com (Steven Osman) Newsgroups: scee.yaroze.programming.3d_graphics Subject: Re: Getting Y coord from Plane and X,Z coords Date: Mon, 17 Jan 2000 03:49:23 GMT Organization: PlayStation Net Yaroze (SCEE) Lines: 57 Message-ID: <38849109.3399350217@news.playstation.co.uk> References: <387FB920.1F1201B7@mcneish.freeserve.co.uk> <3883e37c.3289377294@news.playstation.co.uk> <388253EC.DB41458F@mcneish.freeserve.co.uk> NNTP-Posting-Host: 209.27.57.69 Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Newsreader: Forte Agent 1.5/32.452 Yes, it does, and I'm pretty sure you're correct on the equation of a plane (there is a parametric form also). Good luck. Steven On Sun, 16 Jan 2000 23:27:40 +0000, Bruce McNeish wrote: >Steven, > >I think the equation of a plane is > >aX + bY + cZ + d = 0 > >If I substitute the coords for each known point on the place, the >corners > >I would get 4 equation to solve to give me the equation of the plane, I >could then substitute the X and Z coords of the point required and out >should pop the Y coord? > >Yes, that would work ( I think ), sorry i'm babbling. > >Does this sound right to you? > >Bruce > >b_mcneish@yahoo.com > > >Steven Osman wrote: >> >> I think that staring with the coordinates of the points on the plane >> you should be able to compute the formula of the plane. Then it's >> just as simple as plugging in what you know, to get what you don't. >> >> If you don't know how to derive the equation of a plane, I can look it >> up for you (I think I can at least). >> >> Steven >> >> On Sat, 15 Jan 2000 00:02:40 +0000, Bruce McNeish >> wrote: >> >> >Hi all, >> > >> >I simple puzzel for you boffins to contimplate. >> > >> >I have a polygon which I know the coords of the corners(A,B,C,D). >> > >> >If I have a point that I know the X and Z coords, how do I work out the >> >Y coord of this point? >> > >> >Cheers all, >> > >> >Bruce McNeish