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Builtin: Add vector.angle(). Returns the angle between 2 vectors (#7738)

master
ANAND 2019-03-17 07:35:03 +05:30 committed by Paramat
parent eadcbe474a
commit 7f1c2b8a00
2 changed files with 11 additions and 0 deletions
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9
builtin/common/vector.lua
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@ -70,6 +70,15 @@ function vector.direction(pos1, pos2)
}) })
end end
function vector.angle(a, b)
local dotp = a.x * b.x + a.y * b.y + a.z * b.z
local cpx = a.y * b.z - a.z * b.y
local cpy = a.z * b.x - a.x * b.z
local cpz = a.x * b.y - a.y * b.x
local crossplen = math.sqrt(cpx ^ 2 + cpy ^ 2 + cpz ^ 2)
return math.atan2(crossplen, dotp)
end
function vector.add(a, b) function vector.add(a, b)
if type(b) == "table" then if type(b) == "table" then
return {x = a.x + b.x, return {x = a.x + b.x,

2
doc/lua_api.txt
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@ -2399,6 +2399,8 @@ For the following functions, `v`, `v1`, `v2` are vectors,
* Returns a boolean, `true` if the vectors are identical. * Returns a boolean, `true` if the vectors are identical.
* `vector.sort(v1, v2)`: * `vector.sort(v1, v2)`:
* Returns in order minp, maxp vectors of the cuboid defined by `v1`, `v2`. * 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.
For the following functions `x` can be either a vector or a number: For the following functions `x` can be either a vector or a number: