How do I rotate a part to point in a direction if the part is welded to is rotated?
So, I have this module script which is called by another to script to shoot at an enemy tank. It gets the angle to rotate to to point at the enemy tank and then sets the weld of the turret to that rotation so as to point at the enemy. The problem is its rotation is relative to the part it is welded to. I tried to fix this by subtracting the rotation of the tank, from the rotation which is used to point towards the other tank, but it doesn't seem to work.
local Move = {}
local Tank = script.Parent.Parent
local TurretPart = Tank.Turret
local Stats = Tank.Stats
function Move:Shoot(target)
TurretPart.Shoot:Play()
spawn(function()
local Particle = Tank.TurretAttachments.Muzzle.Shoot
Particle.Enabled = true
wait(.2)
Particle.Enabled = false
end)
print(target.Engine.Position)
local Difference = Tank.Engine.Position - target.Engine.Position
local look = Tank.Engine.CFrame.lookVector
local EngineRot = math.atan(look.x,look.z)
local rot = math.atan(Difference.x,Difference.z)
print(math.deg(rot))
TurretPart.Weld.C0 = CFrame.new(0,.2,.2)
TurretPart.Weld.C1 = CFrame.new(0,0,0) * CFrame.Angles(0,rot - EngineRot,0)
end
return Move
Also the rotation is only about the about the y axis. And the area where the rotation stuff happens is between line 15 and line 22
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1 answer
To understand this problem you have to understand how welds work. The wiki is probably the best place to learn that, but here's the jist of what you need to know.
Welds satisfy the following constraint:
weld.Part0.CFrame * weld.C0 == weld.Part1.CFrame * weld.C1
weld.Part0.CFrame and weld.Part1.CFrame are world space representations of the CFrame of the two parts connected in the weld. This simply means the single CFrame you would use to position the parts if you weren't using welds at all.
You can rearrange this equality to solve for the C0 or the C1 that will satisfy the constraint:
-- C0 weld.C0 == weld.Part0.CFrame:inverse() * weld.Part1.CFrame * weld.C1 -- C1 weld.C1 == weld.Part1.CFrame:inverse() * weld.Part0.CFrame * weld.C0
Hopefully that helps you figure out the rest.
Good luck!
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