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I'm currently writing a basic PlayerController for a Spacecraft Pawn in UE5 (C++, not Blueprint). It's all going well and I've managed to get decent-looking pitch roll and yaw without gimbal lock.

I have a HUD which displays a ProgressBar showing yaw rate. It basically shows the yaw rate "requested" by the InputAction. So for example, if I set a maximum Yaw of 10 degrees per second and I have a maximum rotation of 10 degrees per second, the ProgressBar displays 100%.

What I'd like to do, to give the sense of "Mass" is to gradually accelerate up to the requested Yaw rate. So I have a "Current Yaw Rate" progress bar and a "Requested Yaw Rate" bar.

I'm not certain how to implement this rotational acceleration. I have a feeling that in my Tick function I need to somehow use a Lerp function to gradually approach the requested rate, but everything I've tried so far results in either zero yaw rate or infinite acceleration! Any ideas how I should be doing this?

AJ.
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I appear to have found the answer elsewhere - should have been obvious but this is my first attempt and games programming and the maths is not completely familiar to me.

The simple response was:

float CurrentYawRate = FMath::Lerp(CurrentYawRate, RequestedYawRate, DeltaTime * Acceleration);

I hope this helps anyone else looking for the same thing.

AJ.
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