# How to calculate local velocity if you know it's world velocity and local rotation?

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I'm trying to simulate slip/tracking friction forces for my vehicle in UE4.

• I have the component velocity in World Space
• I have its local rotation

I used the following code to get the local directions for the my vehicle in World Space:

	// Getting direction realtive to the cuboid; Used in steering and friction calculations.
FRotator Rotation = VMesh->GetComponentRotation();
FRotator Yawrotation(0.f, Rotation.Yaw, 0.f);
ForwardDir = FRotationMatrix(Yawrotation).GetUnitAxis(EAxis::X);
RightDir = FRotationMatrix(Yawrotation).GetUnitAxis(EAxis::Y);
UpDir = FRotationMatrix(Yawrotation).GetUnitAxis(EAxis::Z);


I can't figure out how to get it's Local velocity. Can I use the above syntax to solve problem somehow?

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Thank you so much! It works like a charm :) saved me hours of troubleshooting different methods

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Rutin
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