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shama/surfacenormal.js

Last active December 21, 2015 01:29
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calc surface normal
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surfacenormal.js
function crossprod(a, b) {
return [
(a[1] * b[2]) - (a[2] * b[1]),
(a[2] * b[0]) - (a[0] * b[2]),
(a[0] * b[1]) - (a[1] * b[0])
]
}
function subvec(a, b) {
return [
b[0] - a[0],
b[1] - a[1],
b[2] - a[2],
]
}
function surfaceNormal(verts) {
return crossprod(subvec(verts[2], verts[1]), subvec(verts[0], verts[1]))
}
function normalize(v) {
var len = Math.sqrt(v[0] * v[0] + v[1] * v[1] + v[2] * v[2])
if (len === 0) return [0, 0, 0]
var i = 1 / len
return [v[0] * i, v[1] * i, v[2] * i]
}
var a = [0, 1, 0]
var b = [0, 2.9, 0]
var c = [11, 10, 1]
var res = surfaceNormal([a, b, c])
res = normalize(res)
console.log(res)
@max-mapper
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endsolid

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