diff options
| -rw-r--r-- | builtin/common/vector.lua | 12 | ||||
| -rw-r--r-- | doc/lua_api.txt | 4 |
2 files changed, 16 insertions, 0 deletions
diff --git a/builtin/common/vector.lua b/builtin/common/vector.lua index 9a53409fa..782c137d6 100644 --- a/builtin/common/vector.lua +++ b/builtin/common/vector.lua @@ -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, diff --git a/doc/lua_api.txt b/doc/lua_api.txt index 2650bfedf..be19d9e3d 100644 --- a/doc/lua_api.txt +++ b/doc/lua_api.txt @@ -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: |