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Add vector.dot and vector.cross

Mostly copied from MarkuBu's code
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HybridDog authored and sfan5 committed Jul 13, 2019
1 parent 458f617 commit 71db715ba56369c67aa3187315601e2ae25d719a
Showing with 16 additions and 0 deletions.
  1. +12 −0 builtin/common/vector.lua
  2. +4 −0 doc/lua_api.txt
@@ -79,6 +79,18 @@ function vector.angle(a, b)
return math.atan2(crossplen, dotp)
end

function vector.dot(a, b)
return a.x * b.x + a.y * b.y + a.z * b.z
end

function vector.cross(a, b)
return {
x = a.y * b.z - a.z * b.y,
y = a.z * b.x - a.x * b.z,
z = a.x * b.y - a.y * b.x
}
end

function vector.add(a, b)
if type(b) == "table" then
return {x = a.x + b.x,
@@ -2517,6 +2517,10 @@ For the following functions, `v`, `v1`, `v2` are vectors,
* Returns in order minp, maxp vectors of the cuboid defined by `v1`, `v2`.
* `vector.angle(v1, v2)`:
* Returns the angle between `v1` and `v2` in radians.
* `vector.dot(v1, v2)`
* Returns the dot product of `v1` and `v2`
* `vector.cross(v1, v2)`
* Returns the cross product of `v1` and `v2`

For the following functions `x` can be either a vector or a number:

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