Subject:
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Re: calc_z4.c (Was: Math Problem Again)
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Newsgroups:
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lugnet.cad.dev
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Date:
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Fri, 23 Oct 2009 08:31:51 GMT
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Viewed:
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18423 times
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> // calc_z4 by Tore Eriksson
> // credits to Ronan Webb for the superb formula
> double calc_z4(double x1,double y1,double z1,
> double x2,double y2,double z2,
> double x3,double y3,double z3,
> double x4,double y4)
> {
> double a,b,c,minus_d,z4;
> a = y1*(z2-z3) + y2*(z3-z1) + y3*(z1-z2);
> b = z1*(x2-x3) + z2*(x3-x1) + z3*(x1-x2);
> c = x1*(y2-y3) + x2*(y3-y1) + x3*(y1-y2);
> minus_d = x1*(y2*z3-y3*z2) + x2*(y3*z1-y1*z3) + x3*(y1*z2-y2*z1);
> z4 = (minus_d - a*x4 - b*y4)/c;
> return z4;
> }
You also need a touch of code to catch when c=0 so that z4 is undefined ;)
Tim
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Message has 1 Reply:
 | | Re: calc_z4.c (Was: Math Problem Again)
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| In lugnet.cad.dev, Timothy Gould wrote: // calc_z4 by Tore Eriksson // credits to Ronan Webb for the superb formula double calc_z4(double x1,double y1,double z1, double x2,double y2,double z2, double x3,double y3,double z3, double x4,double y4) { (...) (15 years ago, 23-Oct-09, to lugnet.cad.dev)
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Message is in Reply To:
| | calc_z4.c (Was: Math Problem Again)
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| (...) Sorry guys, just wanted to store this function in a safer place than my hard drive. :) I just don't want to remake it again...! Feel free to copy/paste/edit/port if you need it! /Tore // calc_z4 by Tore Eriksson // credits to Ronan Webb for (...) (15 years ago, 22-Oct-09, to lugnet.cad.dev)
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