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authorANAND <ClobberXD@gmail.com>2019-03-17 07:35:03 +0530
committerParamat <paramat@users.noreply.github.com>2019-03-17 02:05:03 +0000
commit7f1c2b8a00ede0659746102762aeb1da487eb6f8 (patch)
tree0dd9b48cd77da498bc14ee6f48a05d7e862df4c4
parenteadcbe474a04174b78d35ab802e974bc2bf3fac6 (diff)
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Builtin: Add vector.angle(). Returns the angle between 2 vectors (#7738)
-rw-r--r--builtin/common/vector.lua9
-rw-r--r--doc/lua_api.txt2
2 files changed, 11 insertions, 0 deletions
diff --git a/builtin/common/vector.lua b/builtin/common/vector.lua
index c3d380ed3..9a53409fa 100644
--- a/builtin/common/vector.lua
+++ b/builtin/common/vector.lua
@@ -70,6 +70,15 @@ function vector.direction(pos1, pos2)
})
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)
if type(b) == "table" then
return {x = a.x + b.x,
diff --git a/doc/lua_api.txt b/doc/lua_api.txt
index 39e0a848d..899c0abdb 100644
--- a/doc/lua_api.txt
+++ b/doc/lua_api.txt
@@ -2399,6 +2399,8 @@ For the following functions, `v`, `v1`, `v2` are vectors,
* Returns a boolean, `true` if the vectors are identical.
* `vector.sort(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: