Vector3: add dot product

This commit is contained in:
Starbeamrainbowlabs 2021-06-26 15:47:53 +01:00
parent dc5645cfeb
commit cfa086ce46
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GPG Key ID: 1BE5172E637709C2
2 changed files with 48 additions and 0 deletions

@ -0,0 +1,36 @@
local Vector3 = require("worldeditadditions.utils.vector3")
describe("Vector3.dot", function()
it("should work with a positive vector", function()
local a = Vector3.new(3, 3, 3)
local b = Vector3.new(4, 5, 6)
assert.are.equal(
45,
a:dot(b)
)
end)
it("should work with a negative vector", function()
local a = Vector3.new(-4, -4, -4)
local b = Vector3.new(4, 5, 6)
assert.are.equal(
-60,
a:dot(b)
)
end)
it("should work with a mixed vector", function()
local a = Vector3.new(-3, 3, -3)
local b = Vector3.new(7, 8, 9)
assert.are.equal(
-24,
a:dot(b)
)
end)
it("should work with the dot_product alias", function()
local a = Vector3.new(-3, 3, -3)
local b = Vector3.new(7, 8, 9)
assert.are.equal(
-24,
a:dot_product(b)
)
end)
end)

@ -162,6 +162,18 @@ function Vector3.length(a)
return math.sqrt(a:length_squared())
end
--- Calculates the dot product of this vector and another vector.
-- @param a Vector3 The first vector to operate on.
-- @param a Vector3 The second vector to operate on.
-- @returns number The dot product of this vector as a scalar value.
function Vector3.dot(a, b)
return a.x * b.x + a.y * b.y + a.z * b.z;
end
--- Alias of Vector3.dot.
function Vector3.dot_product(a, b)
return Vector3.dot(a, b)
end
--- Returns a new vector whose length clamped to the given length.
-- The direction in which the vector is pointing is not changed.
-- @param a Vector3 The vector to operate on.