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planenormvec

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planenormvec

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22 Mar 2005 (Updated )

Calculate the normal vector of a plane in 3D that contains three points.

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Description

VEC = PLANENORMVEC(PT1,PT2,PT3) calculats the normal vector of a plane that includes three points PT1, PT2, and PT3. When the plane is expressed as ax + by + cz = 1, VEC(1) = a, VEC(2) = b, VEC(3) = c. Points should be a 1 x 3 vector, specifying x, y and z values for each column.

(Example)
p1 = [3,4,5];
p2 = [8,-4,0];
p3 = [0,0,1];
vec = planenormvec(p1,p2,p3);

MATLAB release MATLAB 5.3.1 (R11.1)
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Comments and Ratings (1)
04 Dec 2005 Dumb Kid

I tried a simple example of finding normal to the x-y plane using p1(0,0,0) p2(1,0,0) p3(0,1,0). It gives me following error "Three points are badly placed."

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