Rolling a Cube

[BlackDash69]

Hello,

I am trying to roll a cube in Unreal but I am not able to do it. For visualization purpose I am creating something similar to this : https://www.youtube.com/watch?v=3nFpUDAzysY

For this I attached a URotatingMovementComponent and tried to offset the pivot in order to rotate it.
I have attached the code that does it. But it does not work.

Rotating the cube when “Up” Key is pressed

The timer functions which stops the rotation after 1 second

The component that I have attached that makes the rotation possible

[BlackDash69]

Currently it looks like this
The red spheres are the pivot point

[JoeProgram]

Hi BlackDash69,

You’re super close.

The issue is that you’re setting the pivot in world space, but the URotatingMovementComponent PivotTranslation works in local space.

All you need to do is:

1. To your MovementClass.h file, add this include:
   #include "Kismet/KismetMathLibrary.h"

2. To Your RotateUp() function, switch the first two lines to be:

FVector worldLocation = FVector(50.f, 0, -50.f) + GetActorLocation();
RotationDoer->PivotTranslation = UKismetMathLibrary::InverseTransformLocation(GetTransform(), worldLocation);

---

What this code is doing is taking the world space location - the actor’s location plus the offset you want for the pivot - and using InverseTransformLocation to convert it into the cube’s local space that the URotatingMovementComponent is expecting.

If world/local space is new to you, this is a pretty good explainer video.

---

Hope this helps, and good luck on your project!

[BlackDash69]

Thanks a lot I will try it out

[BlackDash69]

Just a small question
How are you stopping the cube from rolling?
Are you using a timer?
Or is it something else?