How do I get a vector direction to be consistent with the rotation of an object?

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1

I need to add the size of a part to a position while firing a gun so it appears in the right place. How do I make the vector that is added/subtracted the same regardless of the rotation or position of the player?

local H = ShootPart.Position + Vector3.new(5, 0, 0) -- ShootPart.Size.Z / 2

This code H adds a vector but it changes the location if the player moves. I need it to be consistent regardless of the rotation or movement of the player.

2

Are you able to use CFrame for this or are you forced to use Vector3 only? If you can use CFrame you can try

local H = ShootPart.CFrame * CFrame.new(5, 0, 0) -- ShootPart.Size.Z / 2

Assuming that ShootPart follows the direction of the player

If you can only use Position/Vector3, at the end of the calculation get Position from the CFrame to only get the Position of the CFrame

local H = (ShootPart.CFrame * CFrame.new(5, 0, 0)).Position -- ShootPart.Size.Z / 2