I was wondering how roblox does not lag because of all the new Vector3’s. If it does lag roblox is there any way to delete a vector3 value?
Your question is very unclear, please elaborate. Which “Vector3s” are you referring to?
Im referring to the .position Vector3.new’s. Doesn’t new create a new vector?
like
game.Workspace.Part.Position = Vector3.new(something)
Vector3s are highly optimized userdatas in Roblox, they don’t lag anything unless they’re running instructions themselves (would have to be a lot). They would only take up more memory, and not a lot with that. You could apply this logic to anything:
- How do all the parts in Roblox not lag?
- How do all the scripts in Roblox not lag?
- How do all the CFrames in Roblox not lag?
- How do all the x in Roblox not lag?
Here’s the source code for Vector3 (an attempted replica I believe)
-- Vector3 class
local vector3 = {__type = "vector3"};
local mt = {__index = vector3};
-- built-in functions
local sqrt = math.sqrt;
local acos = math.acos;
local cos = math.cos;
local sin = math.sin;
-- private functions
local function calcMagnitude(v)
return sqrt(v.x^2 + v.y^2 + v.z^2);
end;
local function normalize(v)
local magnitude = sqrt(v.x^2 + v.y^2 + v.z^2);
if magnitude > 0 then
return vector3.new(v.x / magnitude, v.y / magnitude, v.z / magnitude);
else
-- avoid 'nan' case
return vector3.new(0, 0, 0);
end;
end;
-- meta-methods
function mt.__index(v, index)
if (index == "unit") then
return normalize(v);
elseif (index == "magnitude") then
return calcMagnitude(v);
elseif vector3[index] then
return vector3[index];
elseif rawget(v, "proxy")[index] then
return rawget(v, "proxy")[index];
else
error(index .. " is not a valid member of Vector3");
end;
end;
function mt.__newindex(v, index, value)
error(index .. " cannot be assigned to");
end;
function mt.__add(a, b)
local aIsVector = type(a) == "table" and a.__type and a.__type == "vector3";
local bIsVector = type(b) == "table" and b.__type and b.__type == "vector3";
if (aIsVector and bIsVector) then
return vector3.new(a.x + b.x, a.y + b.y, a.z + b.z);
elseif (bIsVector) then
-- check for custom type
local t = type(a);
local cust = t == "table" and a.__type or t;
error("bad argument #1 to '?' (Vector3 expected, got " .. cust .. ")");
elseif (aIsVector) then
local t = type(b);
local cust = t == "table" and b.__type or t;
error("bad argument #2 to '?' (Vector3 expected, got " .. cust .. ")");
end;
end;
function mt.__sub(a, b)
local aIsVector = type(a) == "table" and a.__type and a.__type == "vector3";
local bIsVector = type(b) == "table" and b.__type and b.__type == "vector3";
if (aIsVector and bIsVector) then
return vector3.new(a.x - b.x, a.y - b.y, a.z - b.z);
elseif (bIsVector) then
-- check for custom type
local t = type(a);
local cust = t == "table" and a.__type or t;
error("bad argument #1 to '?' (Vector3 expected, got " .. cust .. ")");
elseif (aIsVector) then
local t = type(b);
local cust = t == "table" and b.__type or t;
error("bad argument #2 to '?' (Vector3 expected, got " .. cust .. ")");
end;
end;
function mt.__mul(a, b)
if (type(a) == "number") then
return vector3.new(a * b.x, a * b.y, a * b.z);
elseif (type(b) == "number") then
return vector3.new(a.x * b, a.y * b, a.z * b);
elseif (a.__type and a.__type == "vector3" and b.__type and b.__type == "vector3") then
return vector3.new(a.x * b.x, a.y * b.y, a.z * b.z);
else
error("attempt to multiply a Vector3 with an incompatible value type or nil");
end;
end;
function mt.__div(a, b)
if (type(a) == "number") then
return vector3.new(a / b.x, a / b.y, a / b.z);
elseif (type(b) == "number") then
return vector3.new(a.x / b, a.y / b, a.z / b);
elseif (a.__type and a.__type == "vector3" and b.__type and b.__type == "vector3") then
return vector3.new(a.x / b.x, a.y / b.y, a.z / b.z);
else
error("attempt to divide a Vector3 with an incompatible value type or nil");
end;
end;
function mt.__unm(v)
return vector3.new(-v.x, -v.y, -v.z);
end;
function mt.__tostring(v)
return v.x .. ", " .. v.y .. ", " .. v.z;
end;
mt.__metatable = false;
-- public class
function vector3.new(x, y, z)
local self = {};
self.proxy = {};
self.proxy.x = x or 0;
self.proxy.y = y or 0;
self.proxy.z = z or 0;
return setmetatable(self, mt);
end;
function vector3.FromNormalId(id)
pcall(function() id = id.Value or id end);
if (id == 0) then -- right
return vector3.new(1, 0, 0);
elseif (id == 1) then -- top
return vector3.new(0, 1, 0);
elseif (id == 2) then -- back
return vector3.new(0, 0, 1);
elseif (id == 3) then -- left
return vector3.new(-1, 0, 0);
elseif (id == 4) then
return vector3.new(0, -1, 0);
elseif (id == 5) then
return vector3.new(0, 0, -1);
end;
end;
function vector3.FromAxis(id)
pcall(function() id = id.Value or id end);
if (id == 0) then -- right
return vector3.new(1, 0, 0);
elseif (id == 1) then -- top
return vector3.new(0, 1, 0);
elseif (id == 2) then -- back
return vector3.new(0, 0, 1);
end;
end;
function vector3:Lerp(v3, t)
return self + (v3 - self) * t;
end;
function vector3:Dot(v3)
local isVector = v3.__type and v3.__type == "vector3";
if (isVector) then
return self.x * v3.x + self.y * v3.y + self.z * v3.z;
else
error("bad argument #1 to 'Dot' (Vector3 expected, got number)");
end;
end;
function vector3:Cross(v3)
local isVector = v3.__type and v3.__type == "vector3";
if (isVector) then
return vector3.new(
self.y * v3.z - self.z * v3.y,
self.z * v3.x - self.x * v3.z,
self.x * v3.y - self.y * v3.x
);
else
error("bad argument #1 to 'Cross' (Vector3 expected, got number)");
end;
end;
return vector3;
It illustrates how the real Vector3 works in Roblox, and how they are optimized efficiently.
Hopefully I answered your question.
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Vector3s are garbage collected automatically which prevents them from hanging around in memory after they are used. Nowadays, Vector3s are more performant than in previous years as per the following posts:
Thank you for the information!
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