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# Is this the formula for distance from a plane?

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### #1WhatEver  Members

Posted 02 January 2002 - 10:24 AM

TrinaglePos=Tx*Nx+Ty*Ny+Tz*Nz; PointPos=Px*Nx+Py*Ny+Pz*Nz; Distance=sqrt(PointPos-TrianglePos); T is a Triangle vertex. P is the Point in space. N is the Normal. If I'm right, I'm really starting to understand what the Dot Product does. Edited by - WhatEver on January 2, 2002 5:25:41 PM

### #2Dredge-Master  Members

Posted 05 January 2002 - 05:36 AM

was easier than typing it out

you weren't too far off

for programming purposes, you probably can't guarentee that |ax+by+cz+d| is positve, and you don't want to call "sqrt()" too many times, so

When coding it, do something like

distance=a*x+b*y+c*z+d;
distance=sqrt(distance*distance/(a*a+b*b+c*c));

Beer - the love catalyst
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PS - sorry if the image loading is slow. Either my provider or the cable modem is playing up, so it is taking forever to load these images. Should be fixed soon though. Just give it time if it is slow. It is the request that is slowing down, the speed is fine.

Edited by - Dredge-Master on January 5, 2002 12:41:54 PM

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