I’m trying to get a vehicles wheels to rotate proportionally to the vehicles speed when the vehicle is animated with sequencer rather than as a vehicle pawn. I tried to record sequnces as a pawn but they didn’t work [properly and I saw that other users had same problem.
My solution which works for non spline based animations is to assign vehicle mesh to BP, get ‘Get Velocity’ and use vectors length , divided by some value, to determine the wheels (additional meshes) ‘Add Relative Rotation’. Plonk actor at point A keyframe then drag to point and keyframe and it is all hunky dory.
Unfortunately, however, if I try and the actor to follow a path from a spline BP the Velocity vector length bears no relation to what the actor is doing.
It has to do why how you make the vehicle move along the spline.
If you just set its position, then velocity is always 0.
You also may be better off just animating the twist. This would be similar to how you do steering wheel rotations.
Take the overall distance because you know what it is off the spline. Divide it by the wheel diameter, because that the number of rotations you need to have over time.
and you can go from there.
In a perfect, animated, newtonian world. Being an animation I doubt you need to be more precise than this.
When I say go from there.
take the time of the shot that you want the car to travel for, divide it by the number of rotations, and implement a custom rotator or animate the wheel to rotate at the rate you get that way.
This answer is 2 years late, but I happened to be doing the same thing and ran into the same problem. The velocity reported by an actor moving along a spline in the sequencer is indeed inaccurate - mine was reported as about 6,000,000 cm/s when it should have been close to 8,000 cm/s.
I was able to get around this by calculating velocity myself in my animation blueprint:
