luanti-extended-engine-features/leef-math-cd2025
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fixed and redocumented mat4.mul()

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FatalErr42O 2024-12-09 18:41:40 -08:00
parent 1fd42e98ff
commit 9501462e51
17 changed files with 26 additions and 30 deletions
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docs/topics/readme.md.html
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@ -80,7 +80,7 @@
<p>Various useful bits of game math. 3D line intersections, ray casting, 2d/3d vectors, 4x4 matrices, quaternions, etc.</p>
<p>This is a fork of CPML (for LÖVE/love3d), it's been ported over the minetest so it can be used in whatever you need it for.
Documentation can be found here: <a href="https://minetest-unified-library.github.io/LEEF-Math/">https://minetest-unified-library.github.io/LEEF-Math/</a>.</p>
Documentation can be found here: <hhttps://luanti-extended-engine-features.github.io/LEEF-Math/>.</p>
<p>For possible future contributors: documentation must be generated manually when a commit is made, because I haven't set up workflows (and have no idea how to).</p>
@ -92,7 +92,7 @@ Documentation can be found here: <a href="https://minetest-unified-library.githu
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modules/mat4.lua
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@ -524,8 +524,8 @@ end
--- Multiply N matrices.
-- @tparam mat4 out Matrix to store the result
-- @tparam mat4 or {mat4, ...} left hand operand(s)
-- @tparam mat4 right hand operand if a is not table
-- @tparam table a a mat4 or a list of mat4s
-- @tparam mat4 b right operand used if param a is a mat4
-- @treturn mat4 out multiplied matrix result
function mat4.mul(out, a, b)
if mat4.is_mat4(a) then
@ -533,18 +533,14 @@ function mat4.mul(out, a, b)
return out
end
if #a == 0 then
identity(out)
elseif #a == 1 then
-- only one matrix, just copy
for i = 1, 16 do
out[i] = a[1][i]
end
error("incorrect operand, expected two mat4s or list of mat4s but recieved empty table.")
else
local ma = a[1]
local mb = a[2]
for i = 2, #a do
mul_internal(out, ma, mb)
ma = out
local new_mat = a[#a]
for i = #a-1, 1, -1 do
new_mat = a[i]*new_mat
end
for i=1,16 do
out[i] = new_mat[i]
end
end
return out